Vegetation Classification and Mapping Project Report - USGS

National Park Service 

U.S. Department of the Interior 

Natural Resource Program Center 

Vegetation Classification and Distribution 

Mapping Report 

Petrified Forest National Park 

Natural Resource Technical Report NPS/SCPN/NRTR—2009/273

ON THE COVER 


Courtesy of U.S. Geological Survey Southwest Biological Science Center

Vegetation Classification and Distribution Mapping Report: 


Natural Resource Technical Report NPS/SCPN/NRTR—2009/273 

Errata 

Page 

Error 

Correction 

G13 Figure G19. Ground photo for map class B9, 

Greasewood / New Mexico Saltbush Shrubland 

G13 Figure 20. Photosignature for map class B9, 


G32 Figure G57. Ground photo for map class B27, 

Russian Thistle Sand Dune Vegetation 

G32 Figure G58. Photosignature for map class B27, 


Figure G19. Ground photo for map class B10, 

Greasewood / Shrubby Seepweed Shrubland 

Figure 20. Photosignature for map class B10, 


Figure G57. Ground photo for map class B29, Arizona 

Siltbush Sparse Vegetation 

Photosignature for map class B29, Arizona Siltbush 

Sparse Vegetation 

NPS 110/100710, November 2009

Vegetation Classification and Distribution 

Mapping Report 


Natural Resource Technical Report NPS/SCPN/NRTR—2009/273 

Authors 

Kathryn A. Thomas 

U.S. Geological Survey 

Southwest Biological Science Center 

Tucson, Arizona 

Anne Cully 


Southern Colorado Plateau Network 

Northern Arizona University 

Flagstaff, Arizona 

Monica L. McTeague 



Keith Schulz 

NatureServe 

Boulder, Colorado 

J. M. Shawn Hutchinson 

Department of Geography 

Kansas State University 

Manhattan, Kansas 

Project Coordinators 

Anne Cully and Monica L. McTeague 

Editing and design 

Jean Palumbo 




November 2009 




Fort Collins, Colorado

The National Park Service, Natural Resource Program Center publishes a range of reports that address natural resource 

topics of interest and applicability to a broad audience in the National Park Service and others in natural 

resource management, including scientists, conservation and environmental constituencies, and the public. 

The Natural Resource Technical Report Series is used to disseminate results of scientific studies in the physical, 

biological, and social sciences for both the advancement of science and the achievement of the National Park Service 

mission. The series provides contributors with a forum for displaying comprehensive data that are often deleted from 

journals because of page limitations. 

All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically 

credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional 

manner. Data in this report were collected and analyzed using methods based on established, peer-reviewed 

protocols and were analyzed and interpreted within the guidelines of the protocols. This report received informal peer 

review by subject-matter experts who were not directly involved in the collection, analysis, or reporting of the data. 

Views, statements, findings, conclusions, recommendations, and data in this report are those of the author(s) and do 

not necessarily reflect views and policies of the National Park Service, U.S. Department of the Interior. Mention of 

trade names or commercial products does not constitute endorsement or recommendation for use by the National 

Park Service. 

Funding for this report was provided by the National Park Service, Interagency agreements: USDA Aerial Photo Flight 

Offce, F1248020019; USGS Southwest Biological Science Center, F1242030436; USGS Fort Collins Science Center, 

F1242030418; USGS Remote Mapping Center, F2121040009. Cooperative agreements: Northern Arizona University/ 

Colorado Plateau Cooperative Ecosystem Studies Unit, H1200040002; Kansas State University, Department of Geography, 

GISSAL, H7481030054; NatureServe, CA4560B0009. 

This report is available from Southern Colorado Plateau Network (http://science.nature.nps.gov/im/units/scpn/) and 

the Natural Resource Publications Management Web site (http://www.nature.nps.gov/publications/NRPM) on the 

Internet. 

Please cite this publication as: 

Thomas, K. A., M. L. McTeague, A. Cully, K. Schulz, and J. M. S. Hutchinson. 2009. Vegetation classification and 

distribution mapping report: Petrified Forest National Park. National Resource Technical Report NPS/SCPN/NRTR— 

2009/273. National Park Service, Fort Collins, Colorado. 

NPS 110/100710, November 2009 

ii

Contents 

Figures............................................................................................................................................................ iv 

Tables............................................................................................................................................................... v 

Acronyms.and.Abbreviations....................................................................................................................... vii 

Executive.Summary........................................................................................................................................ ix 

Acknowledgments......................................................................................................................................... xi 

1..Introduction................................................................................................................................................ 1 

1.1..Background.......................................................................................................................................... 1 

1.2..Scope.and.Products.............................................................................................................................. 1 

1.3..The.USGS-NPS.Vegetation.Mapping.Program............................................................................... 2 

1.4..The.National.Vegetation.Classification.Standard.............................................................................. 3 

1.5..Park.Environment................................................................................................................................ 5 

2..Identification.and.Classification.of.Plant.Communities......................................................................... 13 

2.1..Methods.............................................................................................................................................. 13 

2.2..Results................................................................................................................................................. 18 

3..Base.Map.Class.Development.................................................................................................................. 23 

3.1..Methods.............................................................................................................................................. 23 

3.2..Results................................................................................................................................................. 29 

4..Accuracy.Assessment.and.Additional.Map.Classes................................................................................. 33 

4.1..Methods.............................................................................................................................................. 33 

4.2..Results................................................................................................................................................. 37 

4.3..Discussion........................................................................................................................................... 48 

5..Literature.Cited......................................................................................................................................... 59 

6..Glossary..................................................................................................................................................... 61 

Appendix.A:.List.of.Petrified.Forest.National.Park.vegetation.mapping.project.products...................A1 

Appendix.B:.Relevé.numbers..................................................................................................................... B1 

Appendix.C:.Global.and.local.plant.community.descriptions................................................................... C1 

Appendix.D:.Plant.species.list................................................................................................................ D1 

Appendix.E:.Plant.community.and.map.class.key................................................................................ E1 

Appendix.F:.Plant.community.and.map.class.crosswalk....................................................................... F1 

Appendix.G:.Map.class.summaries............................................................................................................ G1 

Appendix.H:.Accuracy.assessment.data..................................................................................................... H1 

iii

Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park 

Figures 

Figure.1....Location.of.Petrified.Forest.National.Park.in.Arizona.............................................................. 5 

Figure.2....Petrified.Forest.National.Park,.project.environs,.and.location.of.places.named.in.this................... 

report.and.its.appendices.......................................................................................................... 6 

Figure.3....Location.of.149.classification.relevés.at.Petrified.Forest.National.Park.observed.in.2003.... 15 

Figure.4....Non-metric.Multi-dimensional.Scaling.(NMS).ordination.of.149.classification.relevés,.............. 

2003. ......................................................................................................................................... 16 

Figure.5....The.number.of.significant.indicators.and.the.p-value.for.Indicator.Species.Analysis............. 

scores.................................................................................................................................. ....... 17 

Figure.6....Index.of.aerial.photographs.for.the.northern.half.of.Petrified.Forest.National.Park.......... 22 

Figure.7....Index.of.aerial.photographs.for.the.southern.half.of.Petrified.Forest.National.Park.......... 24 

Figure.8....Location.of.photointerpreters’.observation.points.at.Petrified.Forest.National.Park.......... 25 

Figure.9....Base.map.classes.at.Petrified.Forest.National.Park................................................................. 28 

Figure.10...Location.of.662.accuracy.assessment.points.at.Petrified.Forest.National.Park.observed............... 

in.2006........................................................................................................................................ 37 

Figure.11...An.example.of.New.Mexico.Saltbush./.Galleta.–.Alkali.Sacaton.Shrub.Herbaceous.Veg-.............. 

etation.at.Petrified.Forest.National.Park................................................................................. 43 

Figure.12...An.example.of.Four-wing.Saltbush./.Galleta.Shrubland.at.Petrified.Forest.National............... 

Park.. ......................................................................................................................................... 43 

Figure.13...An.example.of.New.Mexico.Saltbush.Badland.Sparse.Vegetation.at.Petrified.Forest................. 

National.Park............................................................................................................................. 44 

Figure.14...An.example.of.Barren.Badlands.at.Petrified.Forest.National.Park........................................ 44 

Figure.15...An.example.of.Sandsage.Colorado.Plateau.Shrubland.at.Petrified.Forest.National................. 

Park.. ......................................................................................................................................... 44 

Figure.16...An.example.of.Arizona.Siltbush.Sparse.Dwarf-Shrubland.Vegetation.at.Petrified.................... 

Forest.National.Park................................................................................................................. 45 

Figure.17...An.example.of.the.base.map.class.Torrey’s.Jointfir.Shrubland.–.Bigelow’s.Sagebrush........... 

Sparse.Vegetation.at.Petrified.Forest.National.Park............................................................. 45 

Figure.18...Group.map.classes.for.Petrified.Forest.National.Park........................................................... 47 

Figure.19...Macrogroup.map.classes.for.Petrified.Forest.National.Park................................................. 52 

Figure.20...Management.map.classes.for.Petrified.Forest.National.Park............................................... 55 

iv

Contents 

Tables 

Table.1...Terminology.used.to.describe.vegetation.and.map.classes.at.Petrified.Forest.National............. 

Park................................................................................................................................................. 2 

Table.2...The.National.Vegetation.Classification.System,.version.2,.with.definitions.and.examples....... 2 

Table.3...Categories.of.environmental.variables.used.to.identify.unique.biophysical.units.to.sample.......... 

at.Petrified.Forest.National.Park................................................................................................. 13 

Table.4...Summary.of.data.collected.within.2003.classification.relevés................................................... 14 

Table.4...Plant.communities.at.Petrified.Forest.National.Park.and.sources.of.supporting.field.docu-....... 

mentation..................................................................................................................................... 19 

Table.6...Modifiers.applied.to.map.classes.to.further.characterize.the.vegetation.of.each.map.unit...26 

Table.7...Base.map.classes.at.Petrified.Forest.National.Park.and.the.plant.communities.or.land.cover........... 

/land.use.types.they.represent.................................................................................................... 30 

Table.8...Base.map.classes.at.Petrified.Forest.National.Park.occurring.in.polygons.smaller.than.the.......... 

minimum.mapping.unit.size........................................................................................................ 31 

Table.9...Sampling.design.scenarios.used.to.determine.the.target.number.of.field.accuracy.assess-........ 

ment.observation.sites................................................................................................................. 34 

Table.10..Summary.of.data.collected.within.2006.accuracy.assessment.observation.sites..................... 35 

Table.11..Terminology.used.for.accuracy.assessment.data.collection.and.analysis.at.Petrified.Forest......... 

National.Park................................................................................................................................ 36 

Table.12..Accuracy.statistics.for.the.base.map.classes................................................................................ 38 

Table.13..Base.map.class.summary.statistics............................................................................................... 40 

Table.14..Cross-walk.of.group.map.classes.and.base.map.classes............................................................. 42 

Table.15..Accuracy.statistics.for.the.group.map.classes............................................................................. 45 

Table.16..Summary.statistics.for.group.map.classes................................................................................... 46 

Table.17..Cross-walk.of.macrogroup.map.classes.to.base.map.classes..................................................... 49 

Table.18..Accuracy.statistics.for.macrogroup.map.class............................................................................. 50 

Table.19..Summary.statistics.for.macrogroup.map.classes........................................................................ 51 

Table.20..Cross-walk.of.management.to.base.map.classes........................................................................ 53 

Table.21..Accuracy.assessment.statistics.for.management.map.classes.................................................... 54 

Table.22..Summary.statistics.for.management.map.classes....................................................................... 56 

v

Acronyms and Abbreviations 

AA 

ac 

APFO 

BLM 

BOR 

Accuracy assessment 

acres 

Aerial Photography Field Office 

United States Bureau of Land Management 

Bureau of Reclamation 

CEGL 

CIR 

cm 

DEM 

DOQQ 

Community Element Code – Global 

color infrared 

centimeter 

Digital Elevation Model 

Digital Orthophoto Quarter Quadrangle 

DVD 

ECW 

ESRI 

FGDC 

ft 

Digital Video Disk 

Enhanced Compressed Wavelet 

Environmental Systems Research Institute 

Federal Geographic Data Committee 

foot/feet 

GB 

GCP 

GIS 

GISSAL 

GPS 

gigabytes 

Ground Control Point 

Geographic Information System 

Geographic Information Systems Spatial Analysis Laboratory 

Global Positioning System 

ha 

I&M 

in 

ISA 

ITIS 

hectares 

Inventory and Monitoring Program 

inch 

Indicator Species Analysis 

Integrated Taxonomic Information System 

km 

KSU 

m 

mi 

.mdb 

kilometer 

Kansas State University 

meters 

miles 

Microsoft Access file format 

MMU Minimum Mapping Unit 

MRPP Multiple Response Permutation Procedure 

n.d. no date 

NA not applicable 

NAD83 North American Datum of 1983 

NAU 


vii


Acronyms and Abbreviations continued 

NBII 

NED 

NMS 

NP 

NPS 

National Biological Information Infrastructure 

National Elevation Dataset 

Non-metric Multi-dimensional Scaling 

National Park 


NS 

NVCS 

NVC 

.pdf 

PEFO 

not sampled 

National Vegetation Classification Standard 

National Vegetation Classification 

Adobe Portable Document Format 


RMGSC 

SCPN 

SBSC 

spp 

TIF 

Rocky Mountain Geographic Science Center 

Southern Colorado Park Network 

Southwest Biological Science Center 

Species (plural) 

Tagged Image Format 

TNC 

TSN 

UNESCO 

USDA 

USGS 

The Nature Conservancy 

Taxonomic Serial Number 

United Nations Education, Science, and Cultural Organization 

U.S. Department of Agriculture 

United States Geological Survey 

UTM 

VMP 

.xls 

Universal Transverse Mercator 

Vegetation Mapping Program 

Microsoft Excel file format 

viii

Executive Summary 

The classification and distribution 

mapping of the vegetation of Petrified 

Forest National Park (PEFO) and 

surrounding environment was completed 

through a multi-agency effort between 

2003 and 2007. The National Park 

Service’s Southern Colorado Plateau 

Network facilitated the team that 

conducted the work, which comprised 

the U.S. Geological Survey’s Southwest 

Biological Science Center, Kansas State 

University, Northern Arizona University, 

and NatureServe. 

The project team described 39 plant 

communities for PEFO; 38 of which were 

described from quantitative classification 

based on field-relevé data collected in 1996 

and 2003. The team derived one additional 

plant community from field observations 

during the photointerpretation phase 

of the project and field documented it 

during accuracy assessment. The National 

Vegetation Classification Standard served 

as a conceptual framework for assigning 

these plant communities to the alliance 

and association level. Seven of the thirtynine 

plant communities were designated 

“park specials”; that is, plant communities 

with insuffcient data to describe them as 

new alliances or associations. 

The project team also developed a spatial 

vegetation map database representing 

PEFO, with four different map-class 

schemas: base, group, macrogroup, 

and management map classes. The 

base map classes represented the finest 

level of spatial detail. Initial polygons 

were through manual interpretation 

of 2003/2004 1:6,000 true color 

aerial photography supplemented by 

occassional computer screen digitizing on 

a mosaic of digitized aerial photos. These 

polygons were labeled with base map 

classes during photointerpretation. Field 

visits verified interpretation concepts. 

The vegetation map database includes 

● 46 base map classes, which consist of 

associations and park specials classified 

with the quantitative analysis 

● one additional association noted during 

photointerpretation 

● non-vegetated land cover, such as infrastructure, 

land use, and geological land 

cover. 

The base map classes consist of 6,989 

polygons in the project area. A field-based 

accuracy assessment of the base map 

classes showed the overall accuracy to be 

40.6%. 

The group map classes represent 

aggregations of the base map classes, 

approximating the group level of the 


Standard (NVCS), version 2 (Federal 

Geographic Data Committee 2008). 

Terrestrial ecological systems, as described 

by NatureServe (Comer et al. 2003), 

were used as a first approximation of the 

group level. The project team identified 

15 group map classes for this project. The 

overall accuracy of the group map classes 

was determined using the same accuracy 

assessment data as for the base map 

classes. The overall accuracy of the group 

representation of vegetation was 55.7%. 

The next higher level of the NVCS, the 

macrogroup, was also used to develop 

a map class schema. The project team 

identified 13 macrogroup map classes. 

The overall accuracy of the macro group 

representation of vegetation was 73.5%. 

In consultation with park staff, the team 

developed management map classes, 

consisting of park-defined groupings of 

base map classes intended to represent 

a balance between maintaining required 

accuracy and providing a focus on 

vegetation of particular interest or import 

to park managers. The 24 management 

map classes had an overall accuracy of 

68.6%. 

While the main products of this project 

are the vegetation classification and the 

vegetation map databases, a number of 

ix


ancillary digital geographic information 

system and database products were also 

produced and can be used independently, 

or to augment the main products. These 

products include shapefiles of the location 

of field-collected data and relational 

databases of field-collected data. 

x

Acknowledgments 

Behind the authors of this report are the U.S. Geological Survey (USGS), National Park Service 

(NPS), Northern Arizona University (NAU), and Kansas State University affliates that were 

responsible for much of the project’s execution. The project team thanks the NAU classification 

field crew—Josh Lambert and Steve Till—and accuracy assessment field crew Jessica Fisher, Kyle 

Christie, Scott Stollery, Kelsey Johnson, Christina Bille, Meredith Jabis, and Meghan Pope for their 

hard work in the field. Heather Folger, Stacy McKnight, and Lakhbir Kaur from NAU provided data 

entry and quality control. Jonathan Donaldson provided important background research for the 

plant community descriptions. Terry Arundel, Jered Hansen, and Mike Gishey provided technical 

support to the USGS Southwest Biological Science team. Jason Sweet, Clancy Jensen, Katie Franke, 

Joseph Grasela, and Tammy Johnson provided digital data layer development, image processing 

and cartographic support from the Geographic Information Systems Spatial Analysis Laboratory 

(GISSAL) in the Department of Geography at Kansas State University. Patty Guertin of the USGS 

provided invaluable support during the compilation and publishing of the final products. 

Logistical and administrative support was provided by Mark Sogge, Linda Lasley, and John D. 

Kite, Sparrow Adson, and Wendy Parrish of the Southwest Biological Science Center; Marie 

Saul and Cindy Judge of NAU; and Leslie Holland-Bartels and Carl Markon of the USGS Alaska 

Science Center. The team particularly thanks the staff of the Alaska Science Center for housing and 

providing logistical support for M. McTeague during the last part of the project. 

Karen Beppler-Dorn, Chuck Dorn, and Pat Thompson at Petrified Forest National Park provided 

housing, critical logistical support, water drops for backcountry support, vehicle use for the 

classification field teams, and guidance to the project. The NPS Southern Colorado Plateau 

Network, through coordinator Lisa Thomas, provided funding support and information technology 

specialist Nicole Tancreto helped with spatial data acquisition. Tom Forsyth and Lynelle Wright at 

the Intermountain Region assisted with contract development. The USGS-NPS Vegetation Mapping 

Program national offce, through support from Karl Brown, Tammy Hamer, Chris Lea, and Mike 

Story, provided the project team with critical financial and programmatic support. 

Cindy Sessions of the U.S. Department of Agriculture’s Aerial Photography Field Offce assisted with 

the acquisition of aerial photography for the project. 

The project team was permitted access to some sites in the park and in the project boundaries by 

several landowners and agencies. 

The project also benefited from the critical review of the report and digital products by Janet Coles 

of the Northern Colorado Plateau Network and Sam Drake of the University of Arizona. 

The project team is extremely grateful for the help, advice, and assistance provided to the project by 

all these people and their respective institutions. 

xi

1 Introduction 

1.1 Background 

Vegetation is a primary resource of natural 

areas, and description of vegetation 

composition, structure, and distribution is 

fundamental to effective land management. 

The term “vegetation” encompasses 

plants at multiple scales, from the most 

refined floristic levels (referred to as 

“plant communities” in this report) to 

the broadest physiognomic or life-form 

levels. This report describes the methods 

used and results obtained from a four-year 

project (2003-2007) to classify, describe, 

and develop a vegetation map database for 

Petrified Forest National Park (PEFO). 

The National Park Service’s (NPS) 


(SCPN), part of the service-wide 

Inventory and Monitoring (I&M) 

Program, organized and coordinated 

vegetation classification, description, 

and mapping at PEFO. For PEFO as well 

as its other 18 network parks, the SCPN 

needed baseline vegetation data upon 

which to develop and implement specific 

monitoring programs. Park managers 

needed baseline data and information on 

park resources for management purposes. 

In addition to the NPS, the project 

team included members from the U.S. 

Geological Survey (USGS) Southwest 

Biological Science Center (SBSC), 

Department of Geography at Kansas 

State University (KSU), Northern Arizona 

University (NAU), and NatureServe. The 

USGS-NPS Vegetation Mapping Program 

partially funded the project, and the 

project team used the Vegetation Mapping 

Program’s programmatic standards. 

1.2 Scope and Products 

The scope of this project was Petrified 

Forest National Park and its environs, 

consisting of an approximately 1-km buffer 

around the 2003 park boundary. The total 

project area was 53,201 ha (131,463 ac); 

lands within the park boundary comprised 

38,057 ha (94,042 ac) or 71.5% of the 

project area. 

A major goal of the project was to identify 

and classify plant communities at the park, 

based on field-collected vegetation data 

and, to a lesser extent, observations made 

during fieldwork conducted in association 

with photointerpretation. First, the 

project team identified and quantitatively 

described plant communities using the 

National Vegetation Classification System 

(NVCS) as a classification framework. 

The term “plant communities” refers 

to the finest floristic levels of the NVCS 

(associations and alliances) and to park 

specials (i.e. plant communities with 

insuffcient data to describe them as new 

alliances or associations) for some stands 

(table 1). 

Second, the team created a spatial database 

(the vegetation map database) 

documenting the park’s vegetation and 

land cover. The vegetation map database 

represents four map class schemas (table 

1): 

1. the “base” map class, the finest level of 

floristic detail that could be mapped 

2. the “group” map class, a physiognomicfloristic 

view of the vegetation 

3. the “management” map class, park-defined 

groupings of base map classes to 

represent a balance between required 

accuracy and maintaining map classes 

of management concern 

4. the “macrogroup” map class, aggregation 

of group map classes to represent 

the next higher level of the NVCS 

hierarchy 

Finally, we assessed each map-class 

schema for accuracy. The base, group, 

and macrogroup map classes were not 

changed, but the management map classes 

were refined following a meeting with park 

resource staff. 

This report and its appendices document 

the methods, results, and findings for 

the PEFO vegetation characterization 

and mapping project. The project has 

1


Table 1. Terminology used to describe vegetation and map classes at Petrified Forest National 

Park. 

Terminology Definition Derivation 

Plant communities 

Base map class 

Group map class 

Macrogroup map class 

Management map class 

Associations, alliances, and park 

specials 

Individual plant communities or 

groupings of plant communities 

Groupings of base map classes that 

reflect physiognomy and floristics 


reflect physiognomy and floristics 


reflect management interests 

Field relevés or observations 

Photointerpretation 

Based on ecological systems 

Aggregations of group map classes 

Park defined 

2 

also produced a number of interrelated 

products that are available on a DVD that 

accompanies the hard-copy report, or 

on the USGS-NPS Vegetation Mapping 

Program web site (http://biology.usgs. 

gov/npsveg/). A full listing of project 

deliverables, their availability, file name, 

and format appears in Appendix A. 

1.3 The USGS-NPS Vegetation 

Mapping Program 

The USGS-NPS Vegetation Mapping 

Program is a cooperative project 

between the USGS and the NPS whose 

purpose is to classify, describe, and map 

vegetation in more than 270 national 

park units in the United States 1 . The 

USGS Center for Biological Informatics 

administers the program in cooperation 

with the NPS Inventory and Monitoring 

Program. Through implementation of 

the NPS Natural Resource Challenge 

(National Park Service 1999) significant 

funding became available for completing 

important natural resource baseline 

inventories in park units, including 

vegetation classification and mapping. 

This support made it possible for the 

NPS to move forward with dozens of new 

park unit vegetation classification and 

mapping projects. 

The Vegetation Mapping Program 

(VMP) supports consistent vegetation 

classification, mapping, and accuracy 

assessment protocols and standards across 

all park-mapping projects. The program 

has established guidance for all vegetation 

mapping projects in four documents: 

● Standardized National Vegetation 

System (The Nature Conservancy and 

Environmental Systems Research Institute 

1994a) 

● Methodology for Assessing the Utility 

of Existing Data for Vegetation Mapping 

(The Nature Conservancy and Environmental 

Systems Research Institute 

1996) 

● Field Methods for Vegetation Mapping 

(The Nature Conservancy and Environmental 


1994b) 

● Accuracy Assessment Procedures (Environmental 


et al.1994) 

In addition, the program follows 

national standards for all park vegetation 

classification and mapping projects: 

● Vegetation classification follows the 


(FGDC) standards for vegetation classification 

and the National Vegetation 

1 

Language for the sections on the USGS-NPS Classification Standard (NVCS). 

Vegetation Mapping Program, National Vegetation 

● Spatial data formatting follows the 

Classification Standard, and Federal Geographic Data 

Committee was modified from von Loh and others FGDC standards for spatial data 

(2006). transfer.

Introduction 

● Metadata for each spatial dataset follows 

the FGDC metadata standard. 

● Spatial data is provided with a horizontal 

positional accuracy that meets 

National Map Accuracy Standards at 

the 1:24,000 scale; each well-defined 

object within the spatial database is 

within 1/50 of an inch display scale or 

12.2 meters (40 ft) of its actual location. 

● All plant names used in the classification 

are consistent with the Integrated 

Taxonomic Information System (ITIS). 

● Each vegetated map class will meet or 

exceed 80% accuracy at the 90% confidence 

level. 

● The minimum mapping unit (MMU) is 

0.5 ha (1.24 ac). 

1.4 The National Vegetation 

Classification Standard 

Patterns of vegetation vary continuously 

over landscapes. Classification systems 

attempt to categorize those patterns by 

identifying and describing assemblages of 

plants that repeat in similar habitats. The 

NVCS provides a classification framework 

that is the standard for all NPS vegetation 

mapping projects (Comer et al. 2003, The 

Nature Conservancy, and Environmental 

Systems Research Institute 1994a). In 

1997, the FGDC formally adopted the 

NVCS Version 1 (Federal Geographic Data 

Committee 1997). During the course of the 

project, Version 2 of the NVCS (Federal 

Geographic Data Committee 2008) was 

approved, but it was not used in this 

project as the vegetation classification 

units were still under development. 

Not to be confused with the National 

Vegetation Classification (NVC) described 

below, the NVCS refers to the framework 

and rules of classification and evolved 

from vegetation classification work 

conducted over more than two decades 

by The Nature Conservancy (TNC), 

NatureServe, and the Natural Heritage 

Program network (Grossman et al. 1998). 

It derives in part from earlier vegetation 

classification schemes produced by the 

United Nations Educational, Cultural, 

and Scientific Organization (UNESCO) 

(UNESCO 1973, Driscoll et al. 1984). 

Use of this standardized classification 

system helps ensure data compatibility 

throughout the National Park Service and 

other agencies. 

The NVCS is a hierarchical system that 

allows vegetation classification to occur 

at multiple scales. In Version 1, there 

are seven levels: the upper five are based 

on the physiognomic characteristics of 

vegetation, and the lower two are based 

on the floristic characteristics of the plant 

community. Version 2 (Federal Geographic 

Data Committee 2008) has eight levels 

(table 2). The upper three levels (which 

are a reorganization of the five upper 

physiognomic levels from Version 1) 

indicate physiognomic characteristics 

that reflect geographically widespread 

(global) topographic and edaphic factors. 

The middle three levels, which are new 

to the NVCS hierarchy, focus on largely 

biogeographic and habitat factors along 

very broad regional-to-continental 

topographic, edaphic, and disturbance 

gradients. The lower two levels—alliance 

and association—are used in the park 

mapping project and are the same in 

both Version 1 and Version 2, with some 

changes to Version 2 alliances expected. 

Because the Group level in NVCS, 

Version 2 was still under development, 

NatureServe Ecological Systems were 

used to approximate the group level for 

the PEFO group map classes. 

The NVCS provides a framework for levels 

of classification, but it does not provide 

descriptions of the vegetation types at all 

levels. The classification maintained by 

NatureServe and used by many federal 

agencies (including the NPS) is the NVC. 

The NVC includes the plant communities 

(associations and alliances) identified 

and described in the United States. Work 

conducted primarily by TNC through 

1999 provided initial definitions of plant 

communities at each level. NatureServe 

3


Table 2. The National Vegetation Classification System, Version 2, with definitions and examples. 1 

Level Level name Primary basis for classification Example 

Upper 

Level 1 

Upper 

Level 2 

Upper 

Level 3 

Mid 

Level 4 

Mid 

Level 5 

Mid 

Level 6 

Lower 

Level 7 

Lower 

Level 8 

Formation 

Class 

Formation 

Subclass 

Formation 

Division 

Macrogroup 

Group 

Alliance 

Association 

1 

Adopted from Federal Geographic Data Committee (2008) 

Defined by broad combinations of dominant general growth forms adapted to 

basic moisture, temperature, and/or substrate or aquatic conditions. 

Defined by combinations of general dominant and diagnostic growth forms 

that reflect global macroclimatic factors driven primarily by latitude and continental 

position, or that reflect overriding substrate or aquatic conditions. 

Defined by combinations of dominant and diagnostic growth forms that reflect 

global macroclimatic conditions as modified by altitude, seasonality of precipitation, 

substrates, and hydrologic conditions. 

Defined by combinations of dominant and diagnostic growth forms and a 

broad set of diagnostic plant taxa that reflect biogeographic differences in 

composition and continental differences in mesoclimate, geology, substrates, 

hydrology, and disturbance regimes. 

Defined by combinations of moderate sets of diagnostic plant species and 

diagnostic growth forms that reflect biogeographic differences in composition 

and sub-continental to regional differences in mesoclimate, geology, substrates, 

hydrology, and disturbance regimes. 

Defined by combinations of relatively narrow sets of diagnostic plant species 

(including dominants and co-dominants), broadly similar composition, and 

diagnostic growth forms that reflect biogeographic differences in mesoclimate, 

geology, substrates, hydrology, and disturbance regimes. 

Defined by characteristic range of species composition, habitat conditions, 

physiognomy, and diagnostic species, typically at least one of which is found 

in the uppermost or dominant stratum of the vegetation. They reflect regional 

to subregional climate, substrates, hydrology, moisture/nutrient factors, and 

disturbance regimes. 

Defined on the basis of a characteristic range of species composition, diagnostic 

species occurrence, habitat conditions and physiognomy. They reflect topoedaphic 

climate, substrates, hydrology, and disturbance regimes. 

Shrubland and grassland 

Temperate and boreal 

shrubland and grassland 

Temperate shrubland 

and grassland 

North American great 

plains grassland and 

shrubland 

Great Plains tall grassland 

and shrubland 

Great Plains mesic 

tallgrass prairie 

Wet-mesic tallgrass 

prairie 

Central wet-mesic 

tallgrass prairie 

4 

inherited that documentation when 

it branched from TNC. NatureServe 

manages and continues to develop the 

database of NVC plant community entities. 

Their online database, NatureServe 

Explorer (http://www.natureserve.org/ 

explorer/), provides public access to 

regularly updated versions of the NVC 

plant community listings and descriptions. 

NatureServe’s documentation of alliances 

and associations is the most accessible 

listing currently available. However, the 

plant community listings within the NVC 

are not complete, and projects such as the 

one described in this report constantly add 

to the documentation and listing of NVC 

types. 

1.4.1. Alliances and Associations 

Alliances and associations are based on 

both the co-dominant (greatest-canopycover) 

species in the upper strata of a 

stand and on diagnostic species—those 

consistently found in some land-cover 

types, but not others. Associations are 

the most specific classification and are 

hierarchically subsumed in alliances. 

Typically, each association is included in 

only one alliance, while each alliance may 

include many associations. Alliance names 

are generally based on the dominant/ 

diagnostic species in the uppermost 

stratum of the vegetation, though up to 

four species may be used, if necessary, 

to define the type. Associations define 

distinct plant compositions that repeat 

across the landscape and are generally 

named using both the dominant species in

Introduction 

the uppermost stratum of the vegetation 

and one or more dominant species in 

lower strata (or a diagnostic species 

in any stratum). Documentation from 

NatureServe Explorer (2009) describes 

the naming conventions and syntax for all 

NVC names: 

● A hypen with a space on either side (-) 

separates names of species occurring in 

the same stratum. 

● A slash with a space on either side (/) 

separates names of species occurring in 

different strata. 

● Species that occur in the uppermost 

stratum are listed first, followed successively 

by those in lower strata. Order 

of species names generally reflects 

decreasing levels of dominance, constancy, 

or indicator value. Parentheses 

around a species name indicates the 

species is less consistently found either 

in all associations of an alliance, or in 

all occurrences of an association. 

● Association names include the dominant 

species of the significant strata, 

followed by the class in which they 

are classified (e.g., Forest, Woodland, 

or Herbaceous). Alliance names also 

include the class in which they are classified 

(e.g. Forest, Woodland, or Herbaceous), 

but are followed by the word 

“Alliance” to distinguish them from 

associations. 

standards (http://biology.usgs.gov/npsveg/ 

standards.html) or Grossman et al. (1998). 

1.4.2. Ecological Systems 

Classification 

In addition to the NVC, NatureServe has 

created a standardized Ecological Systems 

Classification for describing sites, based 

on both vegetation and the ecological 

processes that drive it. Ecological systems 

are mid-scale biological communities that 

occur in similar physical environments 

and are influenced by similar dynamic 

ecological processes, such as fire or 

flooding. They are not conceptually a 

unit within the NVCS, but are rather a 

vegetation-mapping concept. However, 

NVC associations occur with ecological 

systems. An association may occur in any 

number of ecological systems, limited 

only by the range of ecological settings in 

which that association occurs. Ecological 

systems are broad-scale and can embody 

any number of highly specific associations 

found in a particular setting. 

1.5 Park Environment 

Petrified Forest National Park, part of the 

The species nomenclature for all alliances 

and associations follows Kartesz (1999). 

Examples of association names from 

PEFO: 

Artemisia fililolia / Bouteloua 

eriopoda Shrubland 

Purshia stansburiana – Eriogonum 

corymbosum Shrubland 

Examples of alliance names from PEFO: 

Artemisia filifolia Shrubland Alliance 

Purshia (stansburiana, mexicana) 

Shrubland Alliance 

For more information on the NVC, see the 


Figure 1. Location of Petrified Forest National Park 

in Arizona. 

5


6 

Figure 2. Petrified Forest National Park, project environs, and locations of places named in this report and its appendices.

Introduction 

plateau country of the ‘four-corners’ 

area of the Colorado Plateau, is located 

east of Holbrook in northeastern 

Arizona. The park is hourglass-shaped 

and approximately 40 km (24 mi) long 

(fig. 1). Topographic relief within the 

park is not extreme (1620 m to 1890 m, 

or around 5,273 ft to 6,152 ft), with the 

major elevation changes occurring where 

various mesas within the park drop to 

surrounding plateau lands. The Puerco 

River bisects the park at the midpoint (fig. 

2). Interstate 40 intersects the park in the 

northern section. The Petrified Forest 

Road runs the length of the park and 

connects the northern park headquarters 

and the southern park museum. Two areas 

at PEFO, approximately 50% of the park, 

are designated wilderness: a northern 

wilderness unit located in the Painted 

Desert and a southern unit located in the 

Rainbow Forest area (Thomas et al. 2006). 

The project area includes the entire park 

and a buffer (park environs) of 1 km 

(0.6 mi). These park environs include 

lands owned by private cattle ranchers, 

state lands with cattle allotments, and 

Navajo Nation tribal lands, and consist 

of approximately 15,144 ha (about 37,421 

ac). The entire study area is 53,201 ha or 

around 131,463 ac. 

1.5.1 Park Establishment 

Theodore Roosevelt established Petrified 

Forest National Park as a national 

monument in 1906. His Presidential 

Proclamation (34 Stat. 3266) states: 

“. . . whereas, the mineralized 

remains of Mesozoic forests, 

commonly known as the ‘Petrified 

Forest’ . . . are among the greatest 

of scientific interest and value and 

it appears that the public good 

would be promoted by preserving 

these deposits . . . with as much 

land as may be necessary for proper 

protection thereof.” 

The park contains one of the largest 

concentrations of petrified wood in the 

world, as well as abundant plant and 

animal fossils from the 225 million yearold 

Chinle Formation (NPS 2004, Thomas 

et al. 2006). Subsequent proclamations 

and acts of Congress expanded the park 

to include cultural as well as natural 

resources. PEFO gained national park 

status in 1962 (72 Stat. 69) and portions 

of the park (20,340 ha or 52,070 ac) were 

designated as wilderness in 1970 (84 

Stat. 1105). The boundaries of the park 

now encompass a variety of significant 

natural and cultural resources, including 

some of the most valuable and accessible 

paleontological resources in the world 

(NPS 2004). 

1.5.2 Pre-park History 

According to the most reliable 

information, human occupation of the 

Southwest began after the end of the 

Pleistocene, about 10,000-15,000 years ago 

(Cordell 1997). The earliest inhabitants 

of the southwestern region, called 

Paleo-Indians, hunted large animals like 

mammoth and bison and left evidence 

of their presence in the form of hearths, 

tools, and sometimes bones at kill and 

butchering sites. Although no campsites 

or bone concentrations have been found, 

Folsom-style projectile points with their 

distinctive, fluted (grooved) form have 

been found in the park, suggesting that the 

areas that are now park lands were at least 

occasionally occupied during this period 

(Thomas et al. 2003). 

During the decline and extinction of the 

Pleistocene megafauna after around 10,000 

BC, people most likely relied increasingly 

on plant resources for survival. During the 

Archaic period, from about 6000 BC to 

around 300 AD, plant resources probably 

became an increasingly important part 

of the subsistence base in the Southwest. 

Sometime around 1000 BC, people in 

what is now the southwestern region of 

the United States became more sedentary 

and began to cultivate domesticated plant 

species (Cordell 1997). Crop plants like 

corn and squash developed in Mexico. 

During the time of the Archaic culture, 

7


human occupants of the park area left 

basin metates (grinding stones) and 

tools typical of the period in campsites 

on mesatops throughout the park. The 

transitional nature of the late Archaic 

to more sedentary lifestyle and the use 

of domesticated plants are indicated by 

the presence of charred corn kernels 

associated with one site (Thomas et al. 

2003). 

The development of permanent 

settlements probably began around 200 

AD (Cordell 1997). The first dwellings of 

the Basketmaker II/III Period (300 AD – 

800 AD) were usually semi-subterranean 

pithouses in small clusters or villages. 

These types of structures, along with 

stone-lined storage cists, pottery, baskets, 

and the remains of cultivars, are found 

within the park boundaries (Thomas et 

al. 2003, NPS 2004, http://www.nps.gov/ 

pefo). 

Over time, permanent surface dwellings 

were constructed, populations of the 

Basketmaker III and Pueblo I Period, from 

around 800 AD to around 950 AD, became 

ever more substantial, and there was 

greater aggregation of human populations 

(Cordell 1997). At PEFO, most sites of 

this period occur on the bluff overlooking 

Dead Wash and Puerco River, and in the 

Dry Wash basin and near the southern 

boundaries of the park (Thomas et al. 

2003). 

Small pueblos, clustered near arable 

lands and major watercourses, mark the 

beginning of the Pueblo II/III Period 

around 800 AD, which lasted until around 

1300 AD (Cordell 1997). Pueblo II/III sites, 

typically small pueblos with 10-20 rooms 

and a kiva, occur throughout the park 

(Thomas et al. 2003). The Puerco Ruins, 

one of the most visible archeological 

resources in the park, date from near the 

end of the Pueblo II period (around 1100 

AD). 

During the Pueblo IV Period (1300 AD – 

1450 AD), large multi-room dwellings were 

constructed along major river corridors 

or other reliable water sources. Two major 

pueblos have been found at Petrified 

Forest: Puerco Pueblo and Stone Axe 

Pueblo at Wallace Tank, a spring four miles 

southeast of Puerco Pueblo (Thomas et al. 

2003). Drought and probably other factors 

contributed to the abandonment of the 

park area around the mid 1400s. People 

from the park area probably moved to 

areas with more permanent water supplies. 

The Hopi and Zuni people living in the 

surrounding areas today may be some of 

their descendants (Thomas et al. 2003). 

1.5.3 Historic Period 

Around 1500 AD, Athabascan-speaking 

people (Navajo and Apache tribes 

today) moved into the region, although 

these groups likely did not use lands 

that now make up the park until the 

1700s (NPS 2004, Thomas et al. 2003). 

Early Athabascan-speakers settled in 

mountainous areas. After the arrival of 

Europeans and their livestock, subsistence 

included cattle and sheep, and access to 

grazing lands and adequate watering sites 

became important. Today, the Navajo 

Nation is adjacent to the north boundary 

of the park, and the San Carlos Apache 

Reservation is about 60 mi (96 km) to the 

south. 

Spanish explorers were the first Europeans 

to reach the vicinity of present-day 

park lands. In 1540, some members of 

Coronado’s expedition likely passed to the 

northeast of the park lands on their way 

to Hopi villages and to the Grand Canyon 

area (Bolton 1930). The Petrified Forest 

area itself was probably only peripheral to 

the interests and activities of the Spanish 

and Athabascan speakers, although 

introduced livestock may have grazed 

there in small numbers during the 1700s 

and early 1800s. 

In the 1800s, various American 

expeditions passed through the park 

region. The Sitgreaves expedition in 

1851 and the Whipple expedition in 

8

Introduction 

1853 included several scientists who 

recorded information on the flora, fauna, 

and landscape (relevant comments are 

summarized in Thomas et al. 2003). Beale 

(1857) proceeded westward from Zuni, 

New Mexico, and crossed the Puerco 

River, traveling west until he reached the 

Little Colorado River near Holbrook; 

Beale noted cottonwood trees on the river 

bottoms, along with abundant grass. 

These expeditions, as well as the 

movement of people and livestock to gold 

strikes in California, set the stage for new 

settlers in the area. Cattle and sheep were 

herded through northern Arizona, and 

ranchers moved sheep and cattle into Little 

Colorado drainage areas. The coming of 

the railroad in 1881 further encouraged 

ranching (Thomas et al. 2003). 

1.5.4 Possible Human Impacts on the 

Landscape 

Early humans may have burned the 

vegetation to attract or to drive big game 

(Pyne 1982), although the few artifacts 

from the Paleo period at PEFO suggest 

that there were very few people in the area 

during this time period. Archaic people 

may have also burned or manipulated 

vegetation. In Puebloan times, intensive 

farming, using floodwater agriculture and 

manipulation of intermittent streams, 

may also have affected certain areas of the 

park. Of all the human activities occurring 

in the Petrified Forest region, livestock 

grazing during the historic period probably 

had the most significant effect on the 

landscape. 

Thomas et al. (2003) summarized the 

changes in livestock numbers in Northern 

Arizona during the 1700s and 1800s. On 

Navajo lands, there were around 64,000 

sheep by 1742 and perhaps 500,000 by the 

1850s (Young 1968). The Navajo people 

are said to have grazed sheep on lands 

between the Little Colorado River and the 

San Juan River, and from the San Francisco 

Peaks to the Rio Puerco, thus possibly 

covering lands that are now included 

within the park. After the Navajo returned 

from their exile at Bosque Redondo in 

New Mexico in 1868, they rebuilt their 

herds up to around 1,100,000 sheep, 

400,000 goats, and 60,000 horses (Young 

1968). These herds were likely kept within 

reservation boundaries. However, grazing 

on higher elevations and upstream of 

drainages running into the park likely may 

have affected parklands through erosion 

and down cutting of stream channels. 

The number of sheep held by ranchers 

outside Navajo lands in Arizona increased 

from about 800 in 1870 to 76,000 in 1880 

(Sheridan 1995). This increased to 700,000 

in the next decade. Most of Arizona’s 

sheep were raised in the northern 

counties. Barnes (1913) estimated 

approximately 1,570,000 sheep in Arizona. 

Cattle were not as abundant as sheep, 

their numbers increased from around 

50,000 in the late 1870s (Hamilton 1883) 

to 812,000 in 1913 (Barnes 1913). There 

were ranches in the Holbrook area in the 

late 1800s and early 1900s, so grazing no 

doubt had a direct effect on lands that 

are now part of the park. In addition, 

grazing in the Little Colorado and Puerco 

drainages may also have affected the park 

lands, through erosion and deposition, as 

well as downcutting of stream channels. 

A series of droughts in the late 1800s and 

early 1900s, in association with intense 

grazing, probably accelerated erosion, 

downcutting, and decline of groundwater 

levels (Thomas et al. 2003). 

1.5.5 Climate 

Petrified Forest National Park is within 

Bailey’s (Bailey et al. 1994) Colorado 

Plateau Semidesert Province, a region of 

around 195,000 km 2 (75,300 mi 2 ) including 

parts of Arizona, New Mexico, and 

Utah. In general, the climate has the cold 

winters typical of high elevations. Summer 

days are often hot, and nights are cool. 

Temperature at PEFO is highest in July and 

lowest in January [July mean high = 92.3° F 

with an extreme of 105° F in 1995; January 

mean high = 47.5° F with an extreme of 

9


-27° F in 1971 (mean based on 1931-2009 

data; Western Regional Climate Center, 

http://www.wrcc.dri.edu)]. 

Most of the annual precipitation falls 

in the warm months of July and August 

(Western Regional Climate Center, http:// 

www.wrcc.dri.edu), with more widespread 

rain falling in winter. However, in some 

years, unusual amounts of rainfall may fall 

during late-winter and spring. The mean 

annual precipitation from 1948 to 2007 

was 9.48 in (24.2 cm), with torrential rains 

falling primarily in the summer months, 

but occasionally at other times of the year. 

June is the driest month during most years. 

Peaks in temperature and precipitation 

occur at approximately the same time 

during the year. 

The Mogollon Rim, a massif that stretches 

across the central part of Arizona, 

primarily influences winter storms. PEFO 

is located on the rain shadow side of this 

mountain and canyon region. During the 

winter, precipitation originates in lowpressure 

systems that travel eastward 

from the eastern Pacific and deposits as 

snow or rain as the low encounters the 

Mogollon Rim. However, the Mogollon 

Rim acts as an orographic barrier, reducing 

the amount of snow and rain that reaches 

the park. When precipitation does occur 

from winter storms, it is characterized by 

gentle showers followed by strong winds 


On the Colorado Plateau, this summer 

rainfall pattern is characteristic of areas 

of perennial woodland, shrubland, and 

grassland with a component of warmseason 

annuals that appear from year 

to year, depending on conditions. In 

some of these years, greater than usual 

precipitation, along with the right 

temperatures during late winter or 

spring, may result in the germination and 

establishment of annual plant species in 

great abundance (Cully and Cully 1989). 

1.5.6 Geology, Hydrology, and 

Topography 

The badlands exposed in the park belong 

to the Upper Triassic Chinle Formation 

and represent the deposits of a vast 225 

million year old river system. Around 4-8 

million years ago, during the Miocene and 

Pliocene, fluvial and lacustrine sediments 

were deposited over the Chinle Formation; 

volcanic ash and lava were also deposited 

during this time. More recent Quaternary 

deposits (1.8 million years ago to the 

present) of windblown sand and alluvial 

material cover much of the park (Thomas 

et al. 2006, http://www.nps.gov/pefo). 

Numerous intermittent washes and 

drainages occur throughout the park. 

Perhaps the most reliable, although 

intermittent, water source is the Puerco 

River, a tributary of the Little Colorado 

that runs through the narrow mid-section 

(or “neck”) of the park. Only about 2.7 km 

of stream length is within park boundaries. 

Springs, seeps, tinajas, and tanks also 

occur within park boundaries (Thomas et 

al. 2006). 

Water erosion has shaped much of the 

landscape at the park. Torrential summer 

rains cause rapid erosion from steep, bare 

slopes, and fine sediments are susceptible 

to “piping” or the creation of many small 

tunnels under the surface of slopes and 

hills. Over time, sheet erosion and gullying 

have given the badlands their distinctive 

dissected appearance (http://www.nps. 

gov/pefo). 

Petrified Forest consists of three distinct 

geographic areas: the Painted Desert, the 

Puerco River Valley, and the Rainbow 

Forest. The Painted Desert in the northern 

third of the park is comprised of southwest 

to northeast trending clay hills, mesas, 

and buttes that reflect the influences of 

the Little Colorado River as it erodes the 

Chinle Formation. These “badland” desert 

systems are sparsely vegetated because 

plants have great diffculty becoming 

established in the shrinking and swelling 

10

Introduction 

bentonite soils (Chronic 1986). High 

erosion rates in the Painted Desert also 

make it diffcult for plants to become 

established. From the Painted Desert rim, 

the land slopes down to the southeast 

through a series of wide erosional basins 

to the Puerco River. The middle section of 

the park is a relatively narrow strip of land 

across this valley. In the southern third of 

the park, the land has eroded into small 

groups of buttes and mesas separated by 

the wide expanses of Dry Wash and its 

tributaries (Thomas et al. 2006). 

1.5.7 Wildlife 

Petrified Forest National Park provides 

habitat for a diverse assemblage of 

mammals, avifauna, and herpetofauna. 

Mammals 

The badlands and grasslands of the park 

support 59 species of mammals. Coyotes 

(Canis latrans) are found throughout the 

park. Pronghorn antelope (Antilocapra 

americana) occur in grasslands and 

also occasionally in the badlands of 

the park. Smaller mammals include 

Gunnison’s prairie dog (Cynomys 

gunnisoni), white-tailed antelope squirrel 

(Ammospermophilus leucurus), Ord’s 

kangaroo rat (Dipodomys ordii), and deer 

mice (Peromyscus maniculatus). 

Avifauna 

Birds are the most speciose group of the 

vertebrates, with 231 species known for 

the park. The common raven (Corvus 

corax) is one of the most conspicuous 

bird species, often seen at parking lots 

looking for handouts, as well as flying 

overhead throughout the park. Golden 

eagles (Aquila chrysaetos), various 

hawks, and turkey vultures (Cathartes 

aura) are also seen throughout the park. 

Mockingbirds (Mimus polyglottos) and 

thrashers are found in shrublands and 

grasslands. Horned larks (Eremophila 

alpestris) and meadow larks (Sturnella 

neglecta) are common in the grasslands. 

American robins (Turdus migratorius), 

western bluebirds (Sialia mexicana), 

and Townsends’s solitaires (Myadestes 

townsendi) are found in areas with trees 

(Thomas et al. 2006, http://www.nps.gov/ 

pefo). 

Reptiles and Amphibians 

Current records indicate that PEFO 

supports seven species of amphibians, 

including tiger salamanders (Ambystoma 

tigrinum), Woodhouse’s toads (Bufo 

woodhousii), red-spotted toads (B. 

punctatus), and other toad species. 

Amphibians hibernate in damp soils and 

reproduce when rains form standing water 

in pools and intermittent stream channels. 

The 16 species of reptiles known to occur 

in the park include the colorful collared 

lizard (Crotaphytus collaris), gopher snake 

(Pituophis catenifer), western rattlesnake 

(Crotalus oreganus), and western box 

turtle (Terrapene ornata). 

No federally or state-listed threatened 

or endangered wildlife reside in the park 


1.5.8 Vegetation 

Biotic communities at PEFO belong to the 

Colorado Plateau Semi-Desert Province 

(Bailey et al. 1994) and include primarily 

arid grasslands, xeric shrublands, and 

sparsely vegetated badlands. Riparian 

species, such as cottonwoods and willows 

(Populus spp. and Salix spp.), grow along 

some of the permanent streams. Within 

the province as a whole, woodland is 

the most extensive vegetation formation, 

dominated by open stands of Colorado 

pinyon pine (Pinus edulis) and several 

species of juniper (Juniperus spp.), but the 

extent of woodland in the park is limited. 

Two rare plants are found in the park: 

● gladiator milkvetch (Astragalus xiphoides) 

occurs in several populations 

● paper-spined cactus (Pediocactus 

papyracanthus) occurs in pinyonjuniper 

woodland. 

One of the more important and least 

recognized biological communities in this 

11


area is cryptobiotic soil. These living 

crusts are comprised of cyanobacteria, 

lichens, mosses, green algae, microfungi, 

and bacteria, and represent up to 70% 

of the living ground cover. (NPS 2004, 

Thomas et al. 2006, Belnap and Lange 

2002). 

Sheep and cattle grazed in the Petrified 

Forest area until 1936, when grazing 

was excluded from the southern part of 

the park. In 1981, a perimeter fence was 

erected to prevent trespass grazing on park 

lands. 

Thomas et al. (2003) prepared a 

preliminary vegetation classification for 

PEFO based on field sampling of the 

vegetation, analysis, and classification 

under the National Vegetation 

Classification System. This classification 

identified 19 plant communities 

consisting of seven shrubland alliances, 

three dwarf-shrubland alliances, 

five herbaceous alliances, one dwarf 

shrubland-herbaceous alliance, two 

shrubland-herbaceous alliances, and one 

sparse vegetation alliance. Data from the 

2003 effort are included as part of the 

vegetation classification results listed in 

this report. 

12

2 Identification and Classification of Plant Communities 

2.1 Methods 

The classification team, consisting of 

ecologists M.L. McTeague and A. Cully, 

identified and classified plant communities 

of Petrified Forest National Park (PEFO) 

to the finest floristic level possible. They 

used three approaches: 

1. reanalysis of relevé data collected in 

1996 

2. new field data collection, analysis, and 

quantitative classification 

3. direct field observation during photointerpretation 

for one-plant communities 

(see section 3 Base Map Class 

Development) 

All plant communities, whether identified 

through quantitative classification or 

direct observation, were reconciled with 

the current NatureServe Explorer registry 

of NVC alliances and associations, and 

reviewed for compatibility by K. Schulz of 

NatureServe. New plant assemblages were 

classified as park specials if they were not 

supported by suffcient observation data 

to be identified to an existing alliance or 

association or to be identified as a new, or 

provisional, plant community. 

to the results of the quantitative analysis 

of newly collected data and were 

provisionally assigned plant communities 

at the same time (see “Quantitative data 

analysis” below). 

2.1.1.2 Newly Collected Data 

In 2003, a field team led by M. McTeague 

collected plant-community data in the 

form of cover/abundance values for 

individual plant species in 149 relevé 

plots (Mueller-Dombois and Ellenburg 

2002) (see sample datasheet in the project 

DVD). The sampling design stratified the 

park landscape into unique biophysical 

types for relevé allocation. This approach 

assumed that environmental variables 

drive vegetation patterns at PEFO and that 

a stratification based on environmental 

variables would assure adequate sampling 

across the range of plant-community 

variability. The biophysical types were 

derived by layering spatial data for aspect, 

elevation, watercourse presence, and 

geology in a GIS environment (table 3) 

and identifying each unique combination 

as one type. The number of polygons 

targeted for sampling within each 

biophysical type was proportional to the 

Table 3. Categories of environmental variables used to identify 

2.1.1 Relevé Data unique biophysical units to sample at Petrified Forest National Park. 

2.1.1.1 Existing Data 

The team used relevés 2 from a 1996 

vegetation sampling directed by Dr. 

Kathryn Thomas (Thomas et al. 2003). 

These relevés were collected throughout 

the park in an effort to classify the 

vegetation at PEFO. Previously, they had 

been quantitatively analyzed and assigned 

alliance-level classification. As the plant 

communities were not expected to change 

significantly in that time, the team was able 

to use 186 relevés from the 1996 effort. 

These data were compared qualitatively 

2 

A relevé is a vegetation sample using a quadrant that 

can be square, rectangular, or circular. Size varies according 

to the type of vegetation being sampled. Relevés are 

usually placed non-randomly in a uniform and representative 

sample of the vegetation being sampled. They are 

distinguished from line-transects and completely random 

sampling (Kent an Coker 1992). 

Environmental variables 

Categories 

Aspect North facing (116-269°) 

South facing (270-115°) 

Elevation (Using 10 m DEM) 

High elevation(1756-1890m) 

Low elevation (1620-1755m) 

Stream (Including 5m Buffer) 

Streams 

No Streams 

Geology Map (Apache and Navajo 

County) 

Qal=alluvial/alluvium deposits 

Qc=alluvium and sand sheets 

Qd=eolian deposits 

Ql=colluvial deposits 

TR=Triassic 

Tb=volcanic 

bft=Black Forest Tuff 

ss=sandstone 

13


total area and frequency of occurrence of 

that type within the project area. 

The team had planned to sample at the 

centroid of each selected polygon. If 

the sample site was determined to not 

be representative of a homogeneous 

vegetation community, the relevé was 

moved to the closest representative 

vegetation community within the 

biophysical unit. A 500-m 2 relevé was 

established (1000-m 2 in sparsely vegetated 

communities with less than 10% cover), 

and plant species cover/abundance data, as 

well as environmental data, were collected 

(table 4). The classification team examined 

the field data during the collection period 

to determine if adequate numbers of 

relevés were sampled for each expected 

and observed community type. Plant 

communities under-represented in the 

stratified sampling design were sampled 

opportunistically at the end of the 2003 

field season. 

Table 4. Summary of data collected within 2003 classification relevés at 

Petrified Forest National Park. 

Type of information 

Plot documentation 

Environmental description 

Surface cover 

Vegetation description 

Vegetation strata 

Plant species 

Other vegetation characteristics 

Items noted 

Plot location and identification, geographic 

references, plot size, picture documentation 

Elevation, slope, aspect, position, landform, 

geology, soil texture 

Fine particles, gravel, cobble, stone, boulders, 

bedrock; litter, duff, moss, lichen, 

biotic crust; animal use; human/natural 

disturbance 

Leaf phenology, leaf type, physiognomic 

class 

Height, cover class and dominant species 

each stratum 

Observed plant species on survey site 

Mortality, nurse plant function, etc. 

2.1.1.3 Quantitative Data Analysis 

Data from the 2003 classification relevés 

were entered into a Microsoft® Access 

2000 database and quality checked. The 

cover values for species that occurred in 

multiple strata were combined into a single 

cover estimate for classification and for the 

plant community descriptions. However, 

total cover estimates for tree, shrub, 

and herbaceous cover were calculated 

based on cover estimates for lifeform 

and not strata height. The classification 

team imported the data into an Excel 

spreadsheet and formatted it for use in 

PC-Ord, a multivariate statistical analysis 

program (McCune and Mefford 1999). 

The classification team first identified 

descriptive statistics in the relevé dataset 

and examined whether statistical 

differences existed when comparing 

the compositional heterogeneity of the 

physiognomic groups represented in 

the relevé data. The team initially used 

non-metric multi-dimensional scaling 

(NMS) ordination (which provides 

a view of community organization in 

multi-dimensional space) to analyze the 

entire dataset of 149 relevé sites from the 

2003 field efforts (fig. 3). The resulting 

descriptive statistics showed high betadiversity 

(β=7.46), indicating a high degree 

of compositional heterogeneity. The 

team then attempted to minimize relevé 

heterogeneity by dividing the data into 

four groupings or classes, based on the 

apparent lifeform of the dominant species 

in each relevé: shrubland, grassland, steppe 

(a shrub-grassland mixture), and sparse. 

All analyses were then rerun on each class 

(fig. 4). Species occurring only once within 

a class were usually removed from the 

dataset in order to reduce noise. However, 

if a species occurred only once but was 

the dominant species in a relevé, it was 

retained because of its influence within the 

plant community. 

The team also conducted an outlier 

analysis to identify any relevés that might 

skew the analysis. If it was determined that 

the outlier relevés were actually unique 

plant communities, we retained those 

relevés (despite their introducing noise to 

the dataset) due to their importance for 

the community analysis. 

The team then conducted a cluster 

analysis—a hierarchical clustering 

14

Identification and Classification of Plant Communities 

Figure 3. Location of 149 classification relevés at Petrified Forest 

National Park observed in 2003. 

classification of objects—for each of the 

four groupings. Cluster analysis produces 

a dendrogram with relevés clustered at 

different levels. To choose “stopping 

points” in the cluster analysis dendrogram, 

the team used indicator species analysis 

(ISA) scores, which can identify species 

that characterize a group of relevés 

(Dufrêne and Legendre 1997; McCune 

and Grace 2002). The team used a method 

described by McCune and Grace (2002) to 

maximize the effectiveness of ISA scores 

as a means of identifying natural relevé 

clusters within the dendrogram. Based 

on the assumption that indicator scores 

peak at an intermediate level of clustering, 

they used the change in the number of 

significant indicators as the criterion for 

identifying relevé clusters. 

The team calculated ISA scores and 

p-values for each successive level of the 

cluster analysis, and plotted the number of 

significant indicators against the number 

of clusters at each level of the dendrogram 

(Decker and Coles 2003), as illustrated in 

Figure 5 for the shrubland class. This was 

done for each class to generate a graphic 

that the team could use to evaluate and 

choose the optimum levels indicating 

natural relevé clusters. The stopping point 

for each cluster was interpreted as the 

15

Axis 3 

Axis 2 


Steppe 

Shrubland 

Physiognomic Class 


Herbaceous 

Sparse 

Steppe 

Axis 1 

Herbaceous 

Sparse 

Herbaceous 

Physiognomic Class 


Herbaceous 

Sparse 

Steppe 

Steppe 

Axis 1 


Sparse 

Figure 4. Non-metric Multi-dimensional Scaling (NMS) ordination of 149 classification relevés collected 

in 2003 shows the relevés highly clustered by their physiognomic class on both axes 1 and 3, 

and axes 1 and 2. 

16

Identification and Classification of Plant Communities 

Signifi cant Indicators 

60 

50 

40 

30 

20 

10 

0 

4 5 6 7 8 9 10 11 12 13 14 15 16 17 

Number of clusters 

Figure 5. The number of significant indicators 

(top) and the p-value (bottom) for Indicator 

Species. Analysis scores are calculated for 

each level of the cluster dendrogram (not 

shown) and plotted against the number of 

clusters in the dendrogram for that level. The 

peak score for the number of significant indicators 

and the minimum score for the average 

p-value are used to determine the number of 

clusters that represent the best classification 

of the relevés. The scores for the shrubland 

class in Figure 4 are illustrated here. 

0.5 

0.45 

Average pvalue 

0.4 

0.35 

0.3 

0.25 

0.2 

0.15 

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 

Number of clusters 

finest level of ecological meaning for of the 

relevés within that cluster. 

The team analyzed the optimal groupings 

by looking at the statistically significant 

indicator species, determined in the ISA, 

and identifying species with a p-value of 

30. Only 

dominant and common native species 

were considered indicator species. If 

the species was an exotic species or an 

infrequent, ephemeral species that was 

not likely to be a long-term community 

indicator, it was eliminated from 

the analysis. The classification team 

interpreted these groupings to represent 

provisional NVC vegetation associations. 

The classification team also cross-checked 

the clusters of relevés with established 

NVC associations. During this analysis, 

they assigned each relevé an initial 

association name using previously defined 

association nomenclature (when available) 

listed in NatureServe’s Explorer website 

(http://www.natureserve.org/explorer/). 

If needed, the team developed provisional 

association names. After each cluster was 

assigned a provisional association name, 

the team compared the results among the 

four classes and determined whether there 

was overlap in the provisional associations 

among them. If there was overlap, and the 

relevés represented an association with 

relevés in multiple lifeform classes, the 

relevés were reassigned to the lifeform 

class to which NatureServe had assigned 

the the association. For instance, if 

relevés representing an Atriplex obovata 

dominated plant community were 

provisionally identified as occurring in 

sparse, shrubland, and mixed grass-shrub 

communities, all relevés were re-assigned 

to the community representing the modal 

strata. 

The team also applied a Multiple Response 

Permutation Procedure (MRPP) (McCune 

17


and Grace 2002) to test if the allocated 

NVC associations were different enough 

between each other to be statistically 

significant. MRPP is a nonparametric 

test of the hypothesis that there is no 

difference between groups and provides a 

test statistic and a p-value. 

2.1.2 Photo-Interpreter 

Observations 

One plant community, Sarcobatus 

vermiculatus / Atriplex obovata Shrubland, 

was identified from fieldwork associated 

with photointerpretation. It was described 

without quantitative analysis. 

2.1.3 NVC Nomenclature 

NatureServe reviewed the first iteration of 

plant community names and reconciled 

them with the NVC alliances and 

associations in their Biotics (http:// 

www.natureserve.org/prodServices/ 

biotics.jsp) database. The SBSC and 

NatureServe teams consulted on the NVC 

nomenclature for each plant community 

before the naming was finalized. 

2.2 Results 

The team used the results of the 

reinterpretation of the 1996 classification 

relevés, quantitative classification of 2003 

relevés, and the one photointerpretation 

observation to identify 39 plant 

communities at PEFO (table 5). Appendix 

B lists the strength of documentation for 

all plant communities. Full descriptions 

of these communities can be found in 

Appendix C. Ancillary products related 

to accuracy assessment include all species 

on the classification relevés (as well as the 

species found on accuracy assessment 

sites) and are listed in Appendix D. 

2.2.1 Plant Community 

Characteristics 

Thirty-two of the plant communities at 

PEFO were associations. All but these 

three had been described previously in 

the NatureServe database and/or at other 

locations: Calamovilfa gigantea Desert 

Wash Shrub Herbaceous Vegetation, 

Eriogonum leptophyllum Sparse Vegetation, 

and Purshia stansburiana – Eriogonum 

corymbosum Shrubland. Achnatherum 

hymenoides Shrub Herbaceous Alliance, 

observed and classified in 1996, was not 

observed again in 2003. Since the 1996 

data were insuffcient to classify it to the 

association level, it was eliminated from 

the current listing of plant communities 

for the park. Persistent drought, especially 

in the sampling year 2003, caused many 

perennial grasses to remain dormant or 

to die. As a result, these grasses were not 

as abundant as they were during the 1996 

sampling. 

Seven plant communities were identified 

as park specials (table 5). These plant 

communities appear to be unique to the 

park. Their uniqueness does not imply 

rarity, but rather that they are assemblages 

of plant species for which not enough data 

exists to develop new NVC types. 

The plant communities identified 

represented four major physiognomic 

types: woodland, shrubland, herbaceous, 

and sparse. There were three woodland 

associations within three alliances. These 

three associations were reassigned to 

the shrub grouping of relevés used in 

quantitative classification, based on the 

NatureServe description of the plant 

community. Shrublands were represented 

by 14 associations within 12 alliances, one 

undifferentiated alliance, and four park 

specials. 

Relevés grouped as steppe in quantitative 

classification were reassigned to 

either shrubland or herbaceous based 

on NatureServe description of the 

plant community. Herbaceous plant 

communities were represented by ten 

associations within eight alliances and 

by three park specials. Lastly, sparse 

vegetation at the park was represented by 

four associations within three alliances. 

Some of the woodland, shrubland, and 

herbaceous associations at PEFO were 

18

Table 5. Plant communities at Petrified Forest National Park and sources of supporting field documentation. 

Plant community 

NVCS Alliance 

NatureServe 

database code 

Type 

Number of supporting 

field observations 

19 

WOODLAND 

1 

Juniperus monosperma / Artemisia bigelovii Woodland 

Juniperus monosperma Woodland Alliance 

CEGL000705 

Association 

2003 1 1996 2 2006 3 

2 Pinus edulis - (Juniperus osteosperma) / Bouteloua gracilis Pinus edulis - (Juniperus spp.) Woodland Alliance CEGL000778 Association 1 

Woodland 

3 Populus fremontii / Ericameria nauseosa Woodland Populus fremontii Temporarily Flooded Woodland CEGL002465 Association 2 3 

Alliance 

SHRUBLAND 

4 Allenrolfea occidentalis Shrubland Allenrolfea occidentalis Shrubland Alliance CEGL000988 Association 1 8 

5 Artemisia filifolia / Bouteloua eriopoda Shrubland 

Artemisia filifolia Shrubland Alliance 

CEGL001077 Association 4 

6 Artemisia filifolia Colorado Plateau Shrubland 

CEGL002697 Association 7 6 28 

7 Atriplex canescens / Pleuraphis jamesii Shrubland 

Atriplex canescens Shrubland Alliance 


8 Ericameria nauseosa Desert Wash Shrubland 

Ericameria nauseosa Shrubland Alliance 

CEGL002261 

8 10 17 

9 Forestiera pubescens Shrubland Forestiera pubescens Temporarily Flooded Shrubland CEGL001168 Association 1 

Alliance 

10 Gutierrezia sarothrae - (Opuntia spp.) / Pleuraphis jamesii Gutierrezia sarothrae Dwarf-Shrubland Alliance CEGL002690 Association 2 13 

Dwarf-shrubland 

11 Isocoma drummondii - Pleuraphis jamesii Shrubland 

Park Special 1 3 8 

12 Iva acerosa - Sporobolus airoides Shrubland 

Park Special 1 

2 

13 

Krascheninnikovia lanata / Bouteloua gracilis Dwarf-shrub 

Herbaceous Vegetation 

Krascheninnikovia lanata Dwarf-Shrubland Herbaceous 

Alliance 

CEGL001321 

Association 

14 Krascheninnikovia lanata Dwarf-shrubland Krascheninnikovia lanata Dwarf-Shrubland Alliance CEGL001320 Association 1 1 

15 Purshia stansburiana - Eriogonum corymbosum Shrubland Purshia (stansburiana, mexicana) Shrubland Alliance CEGL004011 Association 5 7 

16 Rhus trilobata - Ephedra (viridis, torreyana) Talus 


17 Salix exigua / Barren Shrubland Salix (exigua, interior) Temporarily Flooded Shrubland 

Alliance 

18 Salvia pachyphylla Dwarf-shrubland 

19 Sarcobatus vermiculatus / Atriplex obovata Shrubland 

20 Sarcobatus vermiculatus / Suaeda moquinii Shrubland Sarcobatus vermiculatus Intermittently Flooded 

Shrubland Alliance 

Rhus trilobata Shrubland Alliance CEGL003776 Association 3 5 

CEGL001200 Association 2 1 

CEGL001370 

Park Special 

Park Special 

Association 

2 

1 

2 

1 

12 

6 

6 

15 

5 

Identification and Classification of Plant Communities

20 

Table 5. continued 


21 Suaeda moquinii Shrubland 

22 Tamarix spp. Temporarily Flooded Semi-natural Shrubland 

HERBACEOUS 

23 Atriplex obovata / Sporobolus airoides - Pleuraphis jamesii 

Shrub Herbaceous Vegetation 

24 Bouteloua eriopoda - Pleuraphis jamesii Herbaceous 

Vegetation 

25 Bouteloua gracilis - Pleuraphis jamesii Herbaceous 


26 Bouteloua gracilis Herbaceous Vegetation 

27 Calamovilfa gigantea Desert Wash Shrub Herbaceous 


28 Ericameria nauseosa / Bouteloua gracilis Shrub Herbaceous 


29 Opuntia whipplei - Sporobolus airoides Shrub Herbaceous 


30 Pleuraphis jamesii - Sporobolus airoides Herbaceous 


NVCS Alliance 

Suaeda moquinii Shrubland Alliance 

Tamarix Spp. Semi-Natural Temporarily Flooded Shrubland 

Alliance 

NatureServe 

database code 

CEGL001991 

CEGL003114 

Type 

Association 

Association 

# of supporting field 

observations 

2003 1 

1 

1996 2 2006 3 

1 

2 1 6 

Sporobolus airoides - (Pleuraphis jamesii) Shrub Herbaceous 


Alliance 

Bouteloua eriopoda Herbaceous Alliance CEGL001751 Association 4 1 1 

Bouteloua gracilis Herbaceous Alliance CEGL001759 Association 3 13 16 

Bouteloua gracilis Herbaceous Alliance 

Calamovilfa gigantea Shrub Herbaceous Alliance 

CEGL001760 

CEGL004012 

Association 

Association 

9 

3 

21 2 

Ericameria nauseosa Shrub Short Herbaceous Alliance CEGL003495 Association 2 6 

Park Special 1 

Pleuraphis jamesii Herbaceous Alliance CEGL001778 Association 4 29 45 

31 Salsola tragus Sand Dune Vegetation Park Special 2 13 

32 Sporobolus airoides - Bouteloua gracilis Herbaceous Vegetation 

Sporobolus airoides Sod Herbaceous Alliance CEGL001686 Association 7 6 41 

33 Sporobolus airoides Southern Plains Herbaceous Vegetation CEGL001685 Association 2 3 36 

34 Sporobolus coromandelianus Herbaceous Vegetation Park Special 1 

35 Sporobolus cryptandrus Great Basin Herbaceous Vegetation Sporobolus cryptandrus Herbaceous Alliance CEGL002691 Association 1 

SPARSE 

36 Atriplex obovata Badland Sparse Vegetation Painted Desert Sparsely Vegetated Alliance CEGL002928 Association 12 15 33 

37 

38 

Ephedra torreyana - Artemisia bigelovii Sparse Vegetation 

Eriogonum leptophyllum Sparse Vegetation 

Ephedra Torreyana Sparsely Vegetated Alliance CEGL002350 

CEGL004013 

Association 

Association 

12 

6 

12 

4 

38 

10 

39 Zuckia brandegeei Sparse Vegetation Zuckia brandegeei Sparsely Vegetated Alliance CEGL002493 Association 17 12 12 

1 

2003 Classification Relevés 

2 

1996 Existing Relevés 

3 

2006 AA Relevés 

Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park

Identification and Classification of Plant Communitiess 

sparse compared to descriptions of the 

plant community in the NatureServe 

database; however, they were not 

classified as sparse vegetation at PEFO 

and remained in the physiognomic level 

assigned by the NatureServe description 

of the plant community. 

21


Figure 6. Index of aerial photographs for the northern half of Petrified Forest National Park. Background color 

scheme represents vegetation management classes for the park (see Figure 9. Base map classes at Petrified Forest 

National Park). 

22

3 Base Map Class Development 

3.1 Methods 

3.1.1 Overview 

To create the base map classes, the 

mapping team, consisting primarily of 

Monica McTeague (NAU) and Anne 

Cully (NPS), developed GIS polygons 

and labeled them to the finest floristic 

level possible using a traditional 

photointerpretation approach. The 

resulting base map polygons are the finest 

spatial data in the GIS database. Ideally, 

each polygon represents a map class 

that consists of one plant community 

that is an association, alliance, or park 

special; or one land-use class. However, 

one-to-one correspondence of map 

class to a single plant community is 

sometimes not possible because mixed 

or indistinguishable photosignatures on 

the aerial photography make it diffcult 

for the photointerpreter to distinguish 

every plant community. In such cases, the 

map class assigned represents a group of 

associations, alliances, or park specials. 

The group, management, and macrogroup 

map classes described in Section 4 derive 

from the base map classes. 

3.1.2 Imagery 

The SCPN acquired new stereo aerial 

photography of PEFO through the U.S. 

Department of Agriculture’s Aerial 

Photography Field Offce (APFO). APFO 

subcontractor Photo Flight Geomatics, 

of Tucson, Arizona, acquired the imagery 

on September 13, 14, 17, and 19 of 2003; 

an additional flight was made on June 17, 

2004 to cover areas that were missed in 

2003. The imagery was taken in true color 

film at a scale of 1:6,000, with 20–40% 

sidelap and 50–60% overlap. The APFO 

provided two sets of 9 × 9-in contact prints 

to the SCPN. The NAU and NPS mapping 

team used the images for reference during 

polygon delineation and labeling. Upon 

project completion, one set of contact 

prints will reside at PEFO and one at the 

SCPN. Figures 6 and 7 show the flight lines 

and photo centers. 

3.1.3 Field Reconnaissance 

The photointerpreters, Cully and 

McTeague, conducted field reconnaissance 

of plant communities and their 

corresponding photosignatures during 

March and October 2004; May, July, 

August, October, and November 2005; and 

April 2006, prior to and simultaneous to 

delineating and labeling polygons. Cully 

and McTeague traveled together in the 

park for the first visits to ensure that they 

had a consistent understanding of the flora 

and plant communities. After the initial 

visits, they divided the park into northern 

and southern portions, and each took one 

portion for photointerpretation. 

Cully and McTeague visited 113 sites in 

areas represented by photosignatures 

that were not easily identifiable on 

the aerial photography, and in areas 

that were representative of vegetation 

associations (fig. 8). At each site they 

recorded (1) the geographic coordinates 

of the site, (2) the vegetation structure 

and composition (including dominant 

species cover estimates), and (3) a brief 

description of the site’s environmental 

characteristics. They took two or more 

digital photographs at each observation 

point. For many sites, they recorded 

additional field observations directly onto 

transparent polyester sheets overlain 

on the aerial photos (see section 3.1.4). 

These were used in the lab as a guide 

during photointerpretation. The data were 

entered into a Microsoft® Access database 

and each observation site was assigned a 

provisional plant community assignment. 

3.1.4 Base Map Class Polygons and 

Labels 

The NAU and NPS mapping team 

delineated map polygons on a transparent 

polyester sheet overlain on the true-color 

aerial photographs. Adjoining photos 

were used to determine the central area 

on a particular photo frame with the least 

distortion, known as the ‘effective area’; 

this area was boxed in on the polyester 

23


24 

Figure 7. Index of aerial photographs for the southern half of Petrified Forest National Park. Background color 

scheme represents vegetation management classes for the park (see Figure 20. Management map classes at 

Petrified Forest National Park).

Base Map Class Development 

overlay as the work area for the photo. 

Fiducial marks (representing a fixed 

basis of reference) were transferred to 

each transparent polyester sheet, along 

with the park code and photo number. A 

stereoscope was used to help distinquish 

topographic features with elevational 

differences and details of photo signatures. 

Each photo of the northern section and 

every other photo of the southern section 

was interpreted, and every other photo 

of the southern section. This decision 

was based on the preferences of each 

photointerpreter after ensuring that 

joining the northern and southern sets of 

transparent polyester sheets would not 

create problems in the final map. 

The ground reference data for 

photointerpretation was supplied by 

the field reconnaissance observations, 

classification relevés, and the 1996 

sampling data. Cully and McTeague 

developed a list of provisional base 

map classes that represented the plant 

communities as seen in the aerial 

photography. They labeled the polygons 

using known and interpreted relationships 

among the photo signatures, the ground 

reference data, and the provisional base 

map classes. Adjustments were made to 

the provisional base map classes and to 

the plant community classification during 

this phase of the project. Adjustments 

consisted of 

● adding map classes to the land use 

classification, based on observations 

during field reconnaissance 

● including unique stands of plant communities 

into existing map classes 

● expanding provisional map class concepts 

to include field observed plant 

communities 

Cully and McTeague identified each 

delineated map class with a numeric 

code referencing its provisional map class 

assignment and any modifiers applicable 

to the polygon. The modifiers, developed 

in coordination with the Northern 

Figure 8. Location of photointerpreters’ observation points at Petrified 

Forest National Park. 

Colorado Plateau Network (NCPN), 

indicated vegetation density (in percentage 

categories), pattern, and height (table 

6) and were applied to the uppermost 

stratum of each plant community. The 

height modifier described the average 

height of the plant community represented 

by the polygon. A modifier was also used 

to describe the environmental condition 

surrounding the vegetation. Cully 

25


Table 6. Modifiers applied to map classes to further characterize the vegetation of each map unit.. 

Modifier 

Modifier code Interpretation 

Density A Open Vegetation/Discontinuous (25-60% cover) 

B Dispersed Vegetation (10-25% cover) 

C Sparse Vegetation (2-10% cover) 

D Barren (


names being adjusted based on the input 

of park staff during that meeting. 

3.1.5. Base Map Automation 

The Geographic Information Systems 

Spatial Analysis Laboratory (GISSAL) in 

the Department of Geography at Kansas 

State University provided the technical 

expertise to automate the polygons 

and associated map class and modifier 

assignments, creating a spatial vegetation 

map database. 

3.1.5.1 Aerial Photograph Mosaic 

SCPN provided GISSAL with one 

complete set of the 1:6,000 true color 

aerial photographs. Each of the 9 in x 9 in 

contact prints was scanned at a resolution 

of 500 dpi and full color depth, then 

saved in TIF image format, resulting in 

an uncompressed file size of 74.5 MB 

per photo. Digital versions of the aerial 

photographs were cropped in Adobe 

Photoshop 6.0 (Adobe Systems Inc., San 

Jose, CA) to remove the black borders 

present on the original hardcopy photos. 

Orthorectification was performed with 

ER Mapper 7.0 (Leica Geosystems, San 

Diego, CA) using National Elevation 

Dataset (NED) digital elevation models 

(DEMs) as the height reference. Northing 

and easting for ground control points 

(GCPs) were determined from an existing 

low-resolution digital orthophotograph. 

Between four and six GCPs common 

to each scanned aerial photograph and 

corresponding digital orthophotograph 

were defined within ER Mapper until a 

root mean square error (RMS ) of ≤ 1 

error 

pixel (equivalent to an error of less than 

0.3048 meters or 12 inches) was achieved. 

When necessary, additional GCPs were 

identified to meet this threshold. The 

output projection and datum for the final 

product were UTM Zone 12N and NAD 

83. 

Individual orthorectified photographs 

were compressed at a ratio of 1:35 

and saved in ECW format. Each of the 

individual orthorectified digital photos 

was combined in a mosaic operation 

and color-balanced in ER Mapper to 

produce the final seamless 1:6,000 scale 

digital photomosaic, at 0.3048 meter or 12 

inch pixel resolution, for the park and its 

environs. 

3.1.5.2 Vegetation Map Database 

Development 

The photointerpretation team provided 

more than 1000 transparent polyester 

sheet overlays with map polygon 

delineation to GISSAL. Each overlay 

included boundary information for 

delineated map polygons, along with codes 

representing the numeric reference for the 

base map class, including any applicable 

modifiers. Overlays were scanned and 

converted into black and white digital 

raster files (TIF format) for processing and 

archiving. 

Digital versions of the scanned overlays 

were orthorectified in ER Mapper 7.0 

using 1/3 arc second (10 meter) digital 

elevation models (DEMs) from the 

National Elevation Dataset (NED) as 

the height reference, and the previously 

created digital orthophotomosaic as the 

base map. As was performed previously 

with orthorectification, 4-6 GCPs common 

between the scanned overlays and the 

high-resolution orthophotomosaic 

were defined within ER Mapper until 

a horizontal root mean square error 

(RMS ) of ≤ 1pixel (equivalent to 0.3048 

error 

meters or 12 inches) was achieved. If 

necessary, additional GCPs were identified 

to meet this threshold. 

After orthorectification was completed, 

each overlay was subjected to a rasterto-vector 

conversion using the ArcScan 

extension available with the ArcGIS 

9.2 (ESRI, Redlands, CA) software. 

Vector line features generated from the 

scanned vegetation boundaries were 

“edge-matched” with boundary lines 

generated from adjacent overlays and then 

converted into polygon features. Map 

unit attribute information, read directly 

from photointerpreter markings on the 

27


Figure 9. Base map classes at Petrified Forest National Park. 

28


overlays, was then added to the attribute 

table of each base map polygon. 

Additional attributes, including vegetation 

associations and communities, were 

then incorporated using a tabular join in 

ArcGIS 9.2. The resulting vegetation map, 

in shapefile format, was then reviewed 

independently for attribute accuracy 

through a “heads-up” comparison of 

the vegetation map with the original 

orthorectified overlays in the ArcMap 

application of ArcGIS 9.2. 

3.2 Results 

The vegetation map database for PEFO 

(fig. 9, table 7) encompasses 46 base map 

classes: 

● 8 classes describing infrastructure 

● 5 describing land cover and geology 

types 

● 4 describing sparse vegetation 

● 15 describing grasslands 

● 15 describing shrublands 

● 2 describing woodlands and forests. 

The vegetation map database is 

georeferenced to Universal Transverse 

Mercator (UTM) projection North 

American Datum of 1983 (NAD 83) zone 

12. 

The vegetation map database contains 

6,989 polygons, of which 1,956 (28%) are 

smaller than 0.5 ha (table 8). The majority 

of the vegetated polygons smaller than 

0.5 ha in size occur in nine base map 

classes. Map classes that occurred in the 

barren badlands were relatively easy to 

distinquish from unvegetated areas on 

the aerial photography and were often 

mapped even when the patches were less 

than 0.5 ha in size. 

but were included within the surrounding 

mapped vegetatation: 1) Artemisia filifolia 

/ Bouteloua eriopoda Shrubland, 2) 

Forestiera pubescens Temporarily Flooded 

Shrubland Alliance, 3) Krascheninnikovia 

lanata Dwarf-shrubland, 4) Suaeda 

moquinii Shrubland, 5) Sporobolus 

coromandelianus Herbaceous Vegetation, 

and 6) Sporobolus cryptandrus Great 

Basin Herbaceous Vegetation. These 

plant communities frequently occurred 

in patches smaller than the minimum 

map unit and are not characteristic of 

any of the base map units. Pinus edulis 

– (Juniperus osteosperma) / Bouteloua 

gracilis Woodland was also not mapped as 

a unique map unit but was incorporated 

with One-seed Juniper / Bigelow’s 

Sagebrush Shrubland as a base map class. 

A summary of the base-map class 

distribution, as well as the distribution of 

the management, group, and macrogroup 

map classes, is presented in section 4. A 

key to the base map classes, crosswalked 

to plant community, as well as the group, 

macrogroup, and management map 

classes, is presented in Appendix E. 

Appendix F lists the relationship of plant 

communities defined in section 2 to base 

map classes and to the other three map 

schemas. Photosignatures and summaries 

of the characteristics of each base map 

class are presented in Appendix G. 

All base map classes have a one-to-one 

representation with a plant community. 

Six plant communities were not 

specifically mapped, as they could not be 

distinquished on the aerial photography, 

29


Table 7. Base map classes at Petrified Forest National Park and the plant communities or land cover/land use types they represent. 


Base Map Class Plant Community Level 

B1 Cottonwood / Rubber Rabbitbrush Woodland 3 Populus fremontii / Ericameria nauseosa Woodland Association 

B2 One-seed Juniper / Bigelow’s Sagebrush Shru- 1 Juniperus monosperma / Artemisia bigelovii Woodland, Pinus Association 

bland 

edulis - (Juniperus osteosperma) / Bouteloua gracilis Woodland 


B3 Blue Sage Dwarf-Shrubland 18 Salvia pachyphylla Dwarf-Shrubland Park Special 

B4 Cliff-rose - Crispleaf Buckwheat Shrubland 15 Purshia stansburiana - Eriogonum corymbosum Shrubland Association 

B5 Copperweed - Alkali Sacaton Shrubland 12 Iva acerosa- Sporobolus airoides Shrubland Park Special 

B6 Coyote Willow Shrubland 17 Salix exigua / Barren Shrubland Association 

B7 Drummond Goldenweed - Galleta Shrubland 11 Isocoma drummondii - Pleuraphis jamesii Shrubland Park Special 

B8 Four-wing Saltbush / Galleta Shrubland 7 Atriplex canescens / Pleuraphis jamesii Shrubland Association 

B9 Greasewood / New Mexico Saltbush Shrubland 19 Sarcobatus vermiculatus / Atriplex obovata Shrubland Park Special 

B10 Greasewood / Shrubby Seepweed Shrubland 20 Sarcobatus vermiculatus / Suaeda moquinii Shrubland Association 

B11 Iodine Bush Shrubland 4 Allenrolfea occidentalis Shrubland Association 

B12 Rubber Rabbitbrush Desert Wash Shrubland 8 Ericameria nauseosa Desert Wash Shrubland Association 

B13 Sandsage Colorado Plateau Shrubland 6 Artemisia filifolia Colorado Plateau Shrubland Association 

B14 Snakeweed - (Prickly Pear) / Galleta Dwarf- 10 Gutierrezia sarothrae - (Opuntia spp.) / Pleuraphis jamesii Association 



B15 Tamarisk Shrubland 22 Tamarix spp. Semi-Natural Temporarily Flooded Shrubland Association 

B16 Three-leafed Sumac - Mormon Tea Talus Shru- 16 Rhus trilobata - Ephedra (viridis, torreyana) Talus Shrubland Association 


B17 Winter-fat / Blue Grama Dwarf-shrub 13 Krascheninnikovia lanata / Bouteloua gracilis Dwarf-shrub Association 


Herbaceous 

B18 Alkali Sacaton Herbaceous Vegetation 33 Sporobolus airoides Southern Plains Herbaceous Vegetation Association 

B19 

Alkali Sacaton - Blue Grama Herbaceous Vegetation 

32 Sporobolus airoides - Bouteloua gracilis Herbaceous Vegetation 

B20 Black Grama - Galleta Herbaceous Vegetation 25 Bouteloua eriopoda - Pleuraphis jamesii Herbaceous Vegetation 

Association 

Association 

B21 Blue Grama Herbaceous Vegetation 26 Bouteloua gracilis Herbaceous Vegetation Association 

B22 Blue Grama - Galleta Herbaceous Vegetation 24 Bouteloua gracilis - Pleuraphis jamesii Herbaceous Vegetation Association 

B23 Galleta - Alkali Sacaton Herbaceous Vegetation 30 Pleuraphis jamesii - Sporobolus airoides Herbaceous Vegetation 

B24 

B25 

B26 

Giant Sandreed Desert Wash Shrub Herbaceous 


New Mexico Saltbush / Alkali Sacaton - Galleta 


Rubber Rabbitbrush / Blue Grama Shrub Herbaceous 


27 Calamovilfa gigantea Desert Wash Shrub Herbaceous Vegetation 

23 Atriplex obovata / Sporobolus airoides - Pleuraphis jamesii 


28 Ericameria nauseosa / Bouteloua gracilis Shrub Herbaceous 


Association 

Association 

Association 

Association 

B27 Russian Thistle Sand Dune Vegetation 31 Salsola tragus Sand Dune Vegetation Park Special 

B28 Whipple Cholla - Alkali Sacaton Shrub Herba- 29 Opuntia whipplei -Sporobolus airoides Shrub Herbaceous Park Special 

ceous Vegetation 


Sparse 

B29 Arizona Siltbush Sparse Vegetation 39 Zuckia brandegeei Sparse Vegetation Association 

B30 New Mexico Saltbush Badland Sparse Vegeta- 36 Atriplex obovata Badland Sparse Vegetation Association 

tion 

B31 Slender Buckwheat Sparse Vegetation 38 Eriogonum leptophyllum Sparse Vegetation Association 

30



Base Map Class Plant Community Level 

B32 Torrey’s Jointfir - Bigelow’s Sagebrush Sparse 37 Ephedra torreyana - Artemisia bigelovii Sparse Vegetation Association 


Land Use/Landforms 

B33 Airstrip Not applicable 

B34 Barren Badlands Not applicable 

B35 Barren Wash Not applicable 

B36 Park Facilities Not applicable 

B37 Park Sites Not applicable 

B38 Railroad Not applicable 

B39 Residences Not applicable 

B40 Roads Not applicable 

B41 Run-off Control Feature Not applicable 

B42 Sand Not applicable 

B43 Stock Ponds Not applicable 

B44 Vegetated Rim Complex Not applicable 

B45 Vegetated Wash Complex Not applicable 

B46 Commercial Development Not applicable 

Table 8. Base map classes at Petrified Forest National Park occurring in polygons smaller than the MMU size. 

Base Map Class 

# map units Total 

less than # all map % Area area 

MMU 1 units


Table 8 continued 


# map units # all map % Area Total 

less than units

4 Accuracy Assessment and Additional Map Classes 

The Southwest Biological Science 

Center (SBSC) team completed the 

vegetation map database by coordinating 

field collection of accuracy assessment 

observations; developing the accuracy 

statistics for the base map classes; 

developing the group, macrogroup, and 

management map classes; and developing 

accuracy assessment statistics for those 

map schemas. In this step, the team 

used the accuracy assessment guidelines 

and protocols developed by the USGS- 

NPS Vegetation Mapping Program 

(Environmental Systems Research 

Institute et al. 1994). They developed the 

accuracy assessment by comparing the 

performance of base map class polygons, 

as mapped, with field-collected data at 

the location of those polygons. 

4.1 Methods 

To conduct the accuracy assessment, the 

team: (1) developed a sampling design, 

(2) collected field data with on-theground 

field sampling (reference data), 

and (3) developed map performance 

statistics. As is common practice when 

measuring uncertainty in mapped 

classes, a sample of polygon locations 

representing each map class (the sample 

data) was compared to the reference data. 

The higher-level group, macrogroup, and 

management map classes consisted of 

aggregations of base map classes. They 

were assessed using the same reference 

data as for the base map. Finally, the team 

developed summary statistics describing 

the characteristics of the base, group, 

macrogroup, and management map 

classes. 

4.1.1 Field Sampling Design 

The map database, with base map 

classes, was made available to the SBSC 

team for accuracy assessment in two 

separate shapefiles. The initial shapefile 

represented the northern half of the park, 

and the final shapefile consisted of the 

entire park, including the southern half. 

Although it is ideal to develop a sampling 

design using a complete map database, 

the full map database was not available 

until the late summer months. Prior to 

developing the sample design, the SBSC 

team checked the topology and data 

structure of each map section for node 

and label errors. 

The team generally limited accuracy 

assessment sampling to within the park 

boundaries. With the approval of park 

managers, the team did not field assess 

land use and non-vegetated map classes. 

These map classes are well known and 

often easier to identify on the aerial 

photography than the vegetated classes, 

and the field team had limited fieldseason 

time to sample the vegetated 

map classes. All vegetated map classes, 

including park specials and those based 

on photointerpretation alone, were 

included in the accuracy assessment 

sampling design. 

The SBSC team used the “scenario” 

table recommended by the Vegetation 

Mapping Program (ESRI et al. 1994) 

to estimate the number of sample sites 

needed for each map class in order to 

achieve a statistical measure of class 

accuracy with a confidence level of 90% 

and an acceptable sample error of 10%. 

Each scenario was based on the number 

of polygons and total area of a map class. 

The team assigned each map class to one 

of five different scenarios to determine 

the target number of sampling sites 

needed (table 9). Depending upon its 

scenario assignment, a map class could 

include between 1 and 30 sampling sites. 

The team developed the sampling 

design for the park in two stages. To 

compensate for the northern half 

containing only a portion of all park 

polygons, the team reduced the initial 

number of sample sites for that section 

by multiplying the portion of the total 

map that the section represented by the 

target number of sample sites determined 

through the scenario table. This allowed 

33


Table 9. Sampling design scenarios used to determine the target number of field accuracy assessment 

observation sites. 

Scenario Class Area Number of Polygons Sample Size 

A Abundant > 50 ha >= 30 30 

B Relatively Abundant > 50 ha < 30 20 

C Relatively Rare < 50 ha > 30 20 

D Rare < 50 ha > 5 but < 30 5 

E Very Rare < 50 ha

Accuracy Assessment and Additional Map Classes 

base. These fine-scale maps allowed each 

field team to locate specific polygons on 

the ground and to visualize the size and 

shape of the polygon they were assessing. 

The field team navigated to each site and 

then examined the polygon, using the field 

maps as a guide to the polygon’s shape. 

They recorded site data (table 10) and 

generally took at least one photo from 

the site waypoint. They determined the 

plant community found on the ground 

and the corresponding base map class 

using the plant community/map class key 

in an area of at least 0.5 ha in size (e.g. 

a circle within a 40-m radius) from the 

geographic coordinates of the designated 

sampling site. The evaluator assigned 

confidence in the base map classes using 

a categorical scale: exact, good (some 

problems), poor, or none that fit; and 

documented the reasons for a confidence 

level that was less than exact. If additional 

map classes or plant communities were 

present in the polygon, the evaluator listed 

alternate map classes. During the accuracy 

assessment fieldwork, the field crew and 

the SBSC project leaders refined the plant 

community/map class key and some of the 

plant community descriptions. 

4.1.3 Field data processing and accuracy 

assessment statistics 

Data from 662 sampling locations were 

entered into a Microsoft Access database. 

The SBSC team rigorously quality checked 

the data including comparing the entered 

data with the original data sheet. 

The SBSC team developed accuracy 

assessment statistics by comparing 

the reference map class (the map class 

determined in the field during accuracy 

assessment) to the map class in the 

vegetation map database (the map class 

assigned by the photointerpreter) at the 

sampled waypoint (table 11). In some 

cases, if the field crew could not access a 

sample location, they made observations 

from a removed location. When this 

occurred, the geographic coordinates 

of the target sample site, as determined 

during development of the sampling 

design, were the geographic location for 

the reference data. The team listed all sites 

where there was a difference in the sample 

and reference comparison (an apparent 

error). The field data sheet for each 

apparent error was re-examined and the 

alternate map class accepted if it matched 

the reference data. 

The team developed a contingency 

table (also known as an error matrix) 

to summarize the reference and sample 

data comparisons for each map class. The 

SBSC team used methods described in the 

Vegetation Mapping Program guidelines 

(Environmental Systems Research Institute 

et al. 1994) to calculate user and producer 

accuracy (see Glossary) for individual 

map classes, as well as overall accuracy, 

and a kappa index, which accounts for 

correct classifications due to chance 

(Foody 1992; The Nature Conservancy 

and Environmental Systems Research 

Institute 1994a). The kappa index was 

calculated for map classes that were 

assigned target sites; map classes that 

were observed in the field, but were not 

Table 10. Summary of data collected within 2006 accuracy assessment observation sites. 

Type of information 

Site documentation 

Map class 

Confidence in map class 


Confidence in plant community 

Vegetation description 

Items noted 

Site identification, georeferencing, photo, elevation 

Base map class of the site 

The evaluators confidence in base map class assignment 

Association, alliance, or park special at site 

The evaluators confidence in plant community assignment 

Cover class, dominant species by strata 

35


Table 11. Terminology used for accuracy assessment data collection and analysis at Petrified Forest National Park. 

Terminology 

Reference map class 

Sample map class 

Contingency table or 

error matrix 

Users accuracy 

Producers accuracy 

Overall accuracy 

Kappa Index 

Definition 

Map class observed in the field during accuracy assessment, considered to be the true map class. 

Map class assigned in the vegetation map database. 

A matrix where rows indicate the sample map classes and columns represent the reference map classes. At 

each row and column intersection, the number of observations for each sample/reference combination is 

noted. The vegetation map database is considered correct for all the cases where the sample map class and 

the reference map class are the same. These observations usually occur on the diagonal on the matrix. 

The number of correct reference observations divided by the total number of reference observations for a 

map class. 

The number of sample map classes correctly mapped divided by the total number of reference observations 

made for that map class. 

The total number of correctly classified reference observations divided by the total number of reference 

observations regardless of map class. 

An alternate expression of overall accuracy with correction for chance correct classifications. 

targeted for accuracy assessment, such as 

a land-cover class observed as a reference 

observation but not targeted as a sample, 

were not included in the calculation of 

the kappa index. Statistics were derived 

using the JMP v5.1 statistical application. 

The two-tailed, 90% confidence intervals 

for users, producers and overall accuracy 

were calculated using Score Confidence 

Interval Tables, which have better coverage 

probabilities with smaller sample, sizes 

(Agresti and Coull 1998). 

4.1.4 Group, Macrogroup, and Management 

Map Classes 

After assessment statistics were calculated 

for the base map classes, the SBSC team 

developed three aggregated map-class 

schemas: the group, macrogroup, and 

management map schemas. The group 

map-class schema is an aggregation of 

base map classes based on the concept 

of the group level of the NVCS Version 

2 (Federal Geographic Data Committee 

2008) (see table 2). The SBSC team used 

the ecological-system assignments for 

associations developed by NatureServe 

as a substitute for assignment of group 

map class, which were not available 

in final form at the time this project 

was completed. The macrogroup is an 

additional midlevel grouping in the NVCS 

Version 2, one level of aggregation above 

the group. 

Management map classes reflect base 

map-class performance and resource 

management needs. User and producer 

accuracy statistics for each map class, as 

well as confusion among map classes as 

shown on the base map contingency table 

(see Appendix H1), were used to develop 

recommendations for aggregations of 

commonly confused and floristically or 

ecologically similar map classes. PEFO 

resource management staff reviewed these 

map-class recommendations at a meeting 

held at the park on May 17, 2007. They 

made recommendations for management 

class aggregations using management 

goals for particular plant communities 

of particular interest, regardless of their 

assessed accuracy performance. 

The SBSC team created a cross-walk 

between the base map classes and each 

aggregated map class (see Appendix F). 

The crosswalks were used to add the 

group, macrogroup, and management map 

classes to the map database. The team also 

created a crosswalk between the reference 

data for the accuracy assessment and the 


classes to conduct an accuracy assessment 

of each aggregated map class. The number 

of polygons and the area of each map class 

within the base, group, macrogroup, and 

management map-class schemas were 

calculated within a GIS. 

36


4.2 Results 

4.2.1 Accuracy Assessment Samples 

In 2006, 662 accuracy assessment locations 

were sampled (fig. 10 ). Data from 630 of 

these locations were used in the accuracy 

assessment analysis. The team eliminated 

32 accuracy assessment points from the 

accuracy assessment analysis in cases 

where the team did not fully understand 

the source of the error. This occurred in 

areas where the sampled point was closer 

to the polygon boundary than the error 

recorded by the GPS unit. The team was 

not sure if the thematic error was due to 

error in georeferencing or to error in the 

vegetation map database. Also, points 

were eliminated when the vegetation 

type recorded did not match the species 

information recorded. 

4.2.2 Base Map Class Accuracy and 

Summary Statistics 

4.2.2.1 Accuracy 

The overall accuracy of the 46 base map 

classes was 40.6%; kappa index was 

42.2% +/- 0.22. As the kappa index and 

its standard error use only map classes 

with both sample and corresponding 

reference data, it is slightly greater than the 

overall accuracy. The contingency table 

for base map class accuracy is presented in 

Appendix H1. 

The nine land-use map classes were not 

assessed (table 12) but the five landform 

defined map classes were. Two of the 

vegetated map classes were not assessed 

for accuracy; each consisted of only one 

polygon outside the park boundaries. 

Three base map classes, Sand, Coyote 

Willow Shrubland and Blue Sage Dwarfshrubland, 

had both 100% user and 

producer accuracy. Another six map 

classes (table 12) met the 80% accuracy 

standard for either the user or producer 

accuracy but not both. Except for 

producer accuracy for Barren Badlands 

(87.5%), accuracy for the seven most 

abundant map classes was less than 80%. 

Figure 10. Location of 662 accuracy assessment points at Petrified Forest 

National Park observed in 2006. 

4.2.2.2 Summary Statistics 

Seven base map classes individually 

contributed 5% or more to the land cover 

of the park (excluding environs); together 

they constitute just over 77% of the total 

park land cover (table 13). The most 

abundant map classes were: 

● New Mexico Saltbush / Galleta – Alkali 

Sacaton Shrub Herbaceous Vegetation 

(24.2%, fig. 11) 

37


Table 12. Accuracy statistics for the base map classes. 


90% CI Producer 90% CI 

Base Map Class User accuracy (range) accuracy (range) 

B1 Cottonwood / Rubber Rabbitbrush Woodland 100.0 42.5 - 100.0 66.7 25.4 - 92.2 

B2 One-seed Juniper / Bigelow’s Sagebrush Shrubland 81.8 57.3 - 93.8 100.0 NA 2 


B3 Blue Sage Dwarf-shrubland 100.0 68.9 - 100.0 100.0 68.9 - 100.0 

B4 Cliff-rose - Crispleaf Buckwheat Shrubland 66.7 43.1 - 84.1 88.9 62.3 - 97.5 

B5 Copperweed / Alkali Sacaton Shrubland 0.0 NA 0.0 NA 

B6 Coyote Willow Shrubland 100.0 27.0 - 100.0 100.0 27.0 - 100.0 

B7 Drummond Goldenweed / Galleta Shrubland NS NS 

B8 Four-wing Saltbush / Galleta Shrubland 40.0 26.7 - 54.9 26.7 17.4 - 38.9 

B9 Greasewood / New Mexico Saltbush Shrubland 41.9 28.6 - 56.6 81.3 61.2 - 92.2 

B10 Greasewood / Shrubby Seepweed Shrubland 100.0 27.0 - 100.0 20.0 4.6 - 56.5 

B11 Iodine Bush Shrubland 21.1 9.8 - 39.5 66.7 34.7 - 88.3 

B12 Rubber Rabbitbrush Desert Wash Shrubland 35.5 23.0 - 50.3 64.7 44.9 - 80.5 

B13 Sandsage Colorado Plateau Shrubland 58.6 43.5 - 72.3 63.0 47.2 - 76.4 

B14 Snakeweed - (Prickly Pear) / Galleta Dwarf-shrubland 0.0 NA NS 3 NS 

B15 Tamarisk Shrubland 31.6 17.3 - 50.4 85.7 54.8 - 96.7 

B16 Three-leafed Sumac - Mormon Tea Talus Shrubland 9.1 2.1 - 32.3 20.0 4.6 - 56.5 

B17 Winter-fat / Blue Grama Dwarf-shrub 0.0 NA 0.0 NA 

Herbaceous 

B19 Alkali Sacaton - Blue Grama Herbaceous Vegetation 37.5 20.8 - 57.8 15.0 8.0 - 26.5 

B18 Alkali Sacaton Herbaceous Vegetation 20.0 10.1 - 35.8 13.5 6.7 - 25.3 

B20 Black Grama - Galleta Herbaceous Vegetation 0.0 NA NS NS 

B22 Blue Grama - Galleta Herbaceous Vegetation 33.3 14.2 - 30.2 18.8 7.8 - 38.8 

B21 Blue Grama Herbaceous Vegetation 0.0 NA 0.0 NA 

B23 Galleta - Alkali Sacaton Herbaceous Vegetation 55.2 40.2 - 69.3 37.2 26.2 - 49.8 

B24 Giant Sandreed Desert Wash Shrub Herbaceous 0.0 NA NS NS 


B25 New Mexico Saltbush / Galleta - Alkali Sacaton Shrub 40.0 27.7 - 54.9 19.4 12.5 - 28.8 


B26 Rubber Rabbitbrush / Blue Grama Shrub Herbaceous 6.9 2.3 - 18.8 40.0 14.3 - 72.8 


B27 Russian Thistle Sand Dune Vegetation 

50.0 32.7 - 67.3 55.6 36.9 - 72.8 

B28 

Sparse 

B29 

Whipple Cholla / Alkali Sacaton Shrub Herbaceous 


Arizona Siltbush Sparse Vegetation 

NS 

13.3 6.1 - 26.6 

NS 

33.3 15.9 - 56.9 

B30 New Mexico Saltbush Badland Sparse Vegetation 16.1 8.1 - 29.6 17.9 9.0 - 32.4 

B31 

B32 

Slender Buckwheat Sparse Dwarf-shrubland Vegetation 

Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 

38.9 22.7 - 58.0 50.0 30.0 - 70.1 

56.7 41.9 - 70.4 44.7 32.3 - 57.9 

38



90% CI Producer 90% CI 

Base map class User accuracy (range) accuracy (range) 

B33 Airstrip Not sampled 

B34 Barren Badlands 87.5 74.9 - 94.3 53.8 42.6 - 64.7 

B35 Barren Wash 70.8 54.1 - 83.3 85.0 67.8 - 93.8 

B36 Park Facilities NS NS 

B37 Park Sites NS NS 

B38 Railroad NS NS 

B39 Residences NS NS 

B40 Roads NS NS 

B41 Run-off Control Feature NS NS 

B42 Sand 100.0 42.5 - 100.0 100.0 42.5 - 100.0 

B43 Stock Ponds NS NS 

B44 Vegetated Rim Complex 42.9 28.8 - 58.2 52.2 35.7 - 68.2 

B45 Vegetated Wash Complex 67.9 52.3 - 80.2 50.0 37.1 - 62.9 

B46 Commercial Development NS NS 

3 

NA = not applicable, statistic could not be calculated. 

2 

NS =map class not sampled during accuracy assessment. 

● Four-wing Saltbush / Galleta Shrubland 

(14.4%, fig. 12) 

● New Mexico Saltbush Badland Sparse 

Vegetation (14.4%, fig. 13) 

● Barren Badlands (12.3%, fig. 14) 

● Sandsage Colorado Plateau Shrubland 

(6.8%, fig. 15) 

● Arizona Siltbush Sparse Vegetation 

(5.7%, fig.16) 

● Torrey’s Jointfir Shrubland – Bigelow’s 

Sagebrush Sparse Vegetation (5.6%, fig. 

17). 

Thirty-one classes contributed less than 

1% cover each. Five map classes occurred 

only in the project environs. Nine of the 

small classes also had more than half of 

their distribution in the park environs. 

Additional information on the distribution 

of each map class occurs in Appendix G. 

4.2.3 Group map class accuracy and 

summary statistics 


Fifteen group map classes (fig. 18, 

Appendix F) were created by aggregating 

the base map classes (table 14). The overall 

accuracy of the group map classes was 

55.7%; Kappa index was 49.9%±0.02 

(table 15, Appendix H2). Colorado 

Plateau Pinyon-Juniper Woodland met 

the 80% standard for both user and 

producer accuracy. Inter-Mountain Basins 

Greasewood Flat and Inter-Mountain 

Basins Riparian Woodland and Shrubland 

meet the 80% standard for producer 

accuracy. The other map classes were 

below 80% accuracy for both the user and 

producer accuracy. 


The group map classes consist of five nonvegetated 

types and ten vegetated map 

classes (table 16). Within the park the three 

most abundant map classes are: 1) Inter- 

Mountain Basins Semi-Desert Shrub- 

Steppe (44.7%), 2) Southern Colorado 

Plateau Sand Shrubland (21.2%), and 3) 

Inter-Mountain Basins Shale Badland. 

Together they constitute 84.3% of the 

park’s vegetated cover. 

Continued on page 48 

39

40 

Table 13. Base map class summary statistics. 



Project area 

# Polygons 

ha ac 

Park area 

% Project 

land 

cover ha ac 

%Park 


cover 

Occurrence 

outside park 

boundaries 

B1 Cottonwood / Rubber Rabbitbrush Woodland 11 15.2 37.6 0.0% 1.7 4.3 0.0% 88.5% 

B2 One-seed Juniper / Bigelow’s Sagebrush Shrubland 27 211.4 522.3 0.4% 70.8 174.9 0.2% 66.5% 


B3 Blue Sage Dwarf-shrubland 12 122.8 303.5 0.2% 69.2 171.0 0.2% 43.7% 

B4 Cliff-rose - Crispleaf Buckwheat Shrubland 11 57.1 141.1 0.1% 57.1 141.1 0.2% 0.0% 

B5 Copperweed / Alkali Sacaton Shrubland 2 2.0 4.9 0.0% 2.0 4.9 0.0% 0.0% 

B6 Coyote Willow Shrubland 6 13.2 32.5 0.0% 2.2 5.4 0.0% 83.4% 

B7 Drummond Goldenweed / Galleta Shrubland 1 0.8 1.9 0.0% 0.0% 100.0% 

B8 Four-wing Saltbush / Galleta Shrubland 803 7339.8 18137.0 13.8% 5473.8 13526.2 14.4% 25.4% 

B9 Greasewood / New Mexico Saltbush Shrubland 48 212.3 524.6 0.4% 186.5 460.8 0.5% 12.2% 

B10 Greasewood / Shrubby Seepweed Shrubland 3 7.4 18.3 0.0% 6.3 15.6 0.0% 14.9% 

B11 Iodine Bush Shrubland 27 56.1 138.7 0.1% 49.6 122.6 0.1% 11.6% 

B12 Rubber Rabbitbrush Desert Wash Shrubland 224 508.4 1256.4 1.0% 343.5 848.9 0.9% 32.4% 

B13 Sandsage Colorado Plateau Shrubland 1032 4492.3 11100.8 8.4% 2577.8 6369.8 6.8% 42.6% 

B14 Snakeweed - (Prickly Pear) / Galleta Dwarf-shrubland 48 438.7 1084.1 0.8% 169.7 419.4 0.4% 61.3% 

B15 Tamarisk Shrubland 59 154.6 382.1 0.3% 62.0 153.3 0.2% 59.9% 

B16 Three-leafed Sumac - Mormon Tea Talus Shrubland 24 98.3 242.8 0.2% 36.2 89.5 0.1% 63.2% 

B17 Winter-fat / Blue Grama Dwarf-shrub 1 3.0 7.4 0.0% 3.0 7.4 0.0% 0.0% 

Herbaceous 

B18 Alkali Sacaton Herbaceous Vegetation 59 125.3 309.6 0.2% 92.3 228.0 0.2% 26.3% 

B19 Alkali Sacaton - Blue Grama Herbaceous Vegetation 42 377.1 931.8 0.7% 284.2 702.3 0.7% 24.6% 

B20 Black Grama - Galleta Herbaceous Vegetation 5 23.6 58.3 0.0% 23.6 58.3 0.1% 0.0% 

B21 Blue Grama Herbaceous Vegetation 28 261.1 645.1 0.5% 33.6 83.0 0.1% 87.1% 

B22 Blue Grama - Galleta Herbaceous Vegetation 31 544.1 1344.5 1.0% 145.0 358.3 0.4% 73.4% 

B23 Galleta - Alkali Sacaton Herbaceous Vegetation 535 4143.3 10238.3 7.8% 1586.0 3919.2 4.2% 61.7% 

B24 Giant Sandreed Desert Wash Shrub Herbaceous Vegetation 32 33.0 81.5 0.1% 17.7 43.7 0.0% 46.4% 

B25 

New Mexico Saltbush / Alkali Sacaton – Galleta Shrub Herbaceous 


712 11046.0 27295.3 20.8% 9218.0 22778.2 24.2% 16.5% 




Park area 

41 


# Polygons 

ha ac 



cover ha ac 

%Park 


cover 

Occurrence 

outside park 

boundaries 

B27 Russian Thistle Sand Dune Vegetation 39 100.7 248.9 0.2% 95.9 236.9 0.3% 4.8% 

B28 Whipple Cholla / Alkali Sacaton Shrub Herbaceous Vegetation 1 0.6 1.6 0.0% 0.0% 100.0% 

Sparse 

B29 Arizona Siltbush Sparse Vegetation 213 2685.0 6634.9 5.0% 2165.3 5350.7 5.7% 19.4% 

B30 New Mexico Saltbush Badland Sparse Vegetation 770 6815.6 16841.7 12.8% 5497.4 13584.5 14.4% 19.3% 

B31 Slender Buckwheat Sparse Dwarf-shrubland Vegetation 21 114.0 281.8 0.2% 113.3 280.0 0.3% 0.6% 

B32 Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 668 3227.3 7974.9 6.1% 2119.2 5236.8 5.6% 34.3% 

Land use/landforms 

B33 Airstrip 1 2.6 6.5 0.0% 0.0% 100.0% 

B34 Barren Badlands 440 5587.5 13807.1 10.5% 4664.9 11527.3 12.3% 16.5% 

B35 Barren Wash 47 498.7 1232.4 0.9% 319.4 789.1 0.8% 36.0% 

B36 Park Facilities 21 16.0 39.5 0.0% 16.0 39.5 0.0% 0.0% 

B37 Park Sites 2 0.8 1.9 0.0% 0.8 1.9 0.0% 0.0% 

B38 Railroad 2 5.2 12.9 0.0% 2.3 5.7 0.0% 56.0% 

B39 Residences 23 2.4 6.0 0.0% 0.1 0.2 0.0% 96.9% 

B40 Roads 52 217.6 537.6 0.4% 143.6 354.9 0.4% 34.0% 

B41 Run-off Control Feature 2 0.5 1.3 0.0% 0.5 1.3 0.0% 0.0% 

B42 Sand 2 2.8 6.9 0.0% 2.8 6.9 0.0% 0.0% 

B43 Stock Ponds 25 8.8 21.8 0.0% 0.0% 100.0% 

B44 Vegetated Rim Complex 55 223.2 551.5 0.4% 167.4 413.6 0.4% 25.0% 

B45 Vegetated Wash Complex 478 1873.2 4628.7 3.5% 1385.8 3424.5 3.6% 26.0% 

B46 Commercial Development 6 1.4 3.5 0.0% 0.0 0.0 0.0% 100.0% 

Total 1 6989 53,201.1 131,463.3 38,057.2 94,042.1 

1 

Area totals may vary by 0.1 to 0.2 units due to rounding. 

Accuracy Assessment and Additional Map Classes


Table 14. Cross-walk of group map classes and base map classes 

Group Map Class 


G1 Agriculture Run-off Control Feature 

Stock Ponds 

G2 Colorado Plateau Mixed Bedrock and Tableland Cliff-rose - Crispleaf Buckwheat Shrubland 

Three-leafed Sumac - Mormon Tea Talus shrubland 

Vegetated Rim Complex 

G3 Colorado Plateau Pinyon-Juniper Woodland One-seed Juniper / Bigelow’s Sagebrush Shrubland 

G4 Development Commercial Development 

G5 Inter-Mountain Basins Active and Stabilized Dune Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation 


G6 Inter-Mountain Basins Greasewood Flat Greasewood / New Mexico Saltbush Shrubland 


Iodine Bush Shrubland 

G7 Inter-Mountain Basins Riparian Woodland and Shru- Cottonwood / Rubber Rabbitbrush Woodland 


Coyote Willow Shrubland 

Tamarisk Shrubland 

G8 Inter-Mountain Basins Wash Barren Wash 

Copperweed / Alkali Sacaton Shrubland 

Drummond Goldenweed / Galleta Shrubland 

Giant Sandreed Desert Wash Shrub Herbaceous Vegetation 

Rubber Rabbitbrush Desert Wash Shrubland 

Vegetated Wash Complex 

G9 Inter-Mountain Basins Semi-Desert Grassland Alkali Sacaton - Blue Grama Herbaceous Vegetation 

Alkali Sacaton Herbaceous Vegetation 

Black Grama - Galleta Herbaceous Vegetation 

Blue Grama - Galleta Herbaceous Vegetation 

Blue Grama Herbaceous Vegetation 

Galleta - Alkali Sacaton Herbaceous Vegetation 

Whipple Cholla / Alkali Sacaton Shrub Herbaceous Vegetation 

G10 Inter-Mountain Basins Semi-Desert Shrub-Steppe Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 

New Mexico Saltbush / Galleta - Alkali Sacaton Shrub Herbaceous 


New Mexico Saltbush Badland Sparse Vegetation 

Snakeweed - (Prickly Pear) / Galleta Dwarf-shrubland 

Winter-fat / Blue Grama Dwarf-shrub 

G11 Inter-Mountain Basins Shale Badland Arizona Siltbush Sparse Vegetation 

Barren Badlands 

Blue Sage Dwarf-shrubland 

Sand 


G12 Park Facilities Park Facilities 

Park Sites 

G13 Residential Residences 

42





G14 Southern Colorado Plateau Sand Shrubland Four-wing Saltbush / Galleta Shrubland 

Sandsage Colorado Plateau Shrubland 

G15 Transportation Airstrip 

Railroads 

Roads 

Figure 11. An example of New Mexico Saltbush 

/ Galleta – Alkali Sacaton Shrub Herbaceous 

Vegetation at Petrified Forest National Park. 

Figure 12. An example of Four-wing Saltbush 

/ Galleta Shrubland at Petrified Forest National 

Park. 

43


Figure 13. An example of New Mexico 

Saltbush Badland Sparse Vegetation at 


Figure 14. An example of Barren Badlands 

at Petrified Forest National Park. 

Figure 15. An example of Sandsage 

Colorado Plateau Shrubland at Petrified 


44


Figure 16. An example of Arizona Siltbush 

Sparse Dwarf-Shrubland Vegetation 

at Petrified Forest National Park. 

Figure 17. An example of the base map 

class Torrey’s Jointfir Shrubland – Bigelow’s 

Sagebrush Sparse Vegetation at 


Table 15. Accuracy statistics for the group map classes. 

User 90% CI 1 Producer 90% CI 

Group Map Class accuracy (range) accuracy (range) 

G1 Agriculture Not sampled Not sampled 

G2 Colorado Plateau Mixed Bedrock and Tableland 52.9 41.6 - 64.0 73.0 59.7 - 83.1 

G3 Colorado Plateau Pinyon-Juniper Woodland 81.8 57.3 - 93.8 100.0 76.9 - 100.0 

G4 Development Not sampled Not sampled 

G5 Inter-Mountain Basins Active and Stabilized Dune 36.7 26.4 - 48.5 78.3 61.6 - 89.0 

G6 Inter-Mountain Basins Greasewood Flat 47.1 36.0 - 58.4 85.7 71.7 - 93.4 

G7 Inter-Mountain Basins Riparian Woodland and Shrubland 40.9 25.6 - 58.2 81.8 57.3 - 93.8 

G8 Inter-Mountain Basins Wash 66.3 57.7 - 73.9 69.4 60.7 - 76.9 

G9 Inter-Mountain Basins Semi-Desert Grassland 69.3 60.8 - 76.7 44.9 38.0 - 51.9 

G10 Inter-Mountain Basins Semi-Desert Shrub-Steppe 41.8 34.7 - 49.2 38.1 31.5 - 45.1 

G11 Inter-Mountain Basins Shale Badland 60.2 51.5 - 68.4 62.4 53.5 - 70.5 

G12 Park Facilities Not sampled Not sampled 

G13 Residential Not sampled Not sampled 

G14 Southern Colorado Plateau Sand Shrubland 67.8 57.2 - 76.8 55.6 45.9 - 64.8 

G15 Transportation Not sampled NS 

1 

CI = confidence interval 

45

46 

Table 16. Summary statistics for group map classes. 



# Polygons ha ac 

Park area 


land cover ha ac 

% Park 

land cover 

Occurrence 

outside park 

boundaries 

G1 Agriculture 27 9.3 23.1 0.0% 0.5 1.3 0.0% 94.3% 

G2 Colorado Plateau Mixed Bedrock and Tableland 90 378.5 935.4 0.7% 260.7 644.1 0.7% 31.1% 

G3 Colorado Plateau Pinyon-Juniper Woodland 27 211.4 522.3 0.4% 70.8 174.9 0.2% 66.5% 

G4 Development 6 1.4 3.5 0.0% 0.0 0.0 0.0% 100.0% 

G5 

Inter-Mountain Basins Active and Stabilized 

Dune 

377 1631.0 4030.4 3.1% 946.6 2339.1 2.5% 42.0% 

G6 Inter-Mountain Basins Greasewood Flat 78 275.8 681.6 0.5% 242.4 599.0 0.6% 12.1% 

G7 

Inter-Mountain Basins Riparian Woodland and 


76 183.0 452.2 0.3% 66.0 163.0 0.2% 63.9% 

G8 Inter-Mountain Basins Wash 784 2916.1 7205.9 5.5% 2068.4 5111.1 5.4% 29.1% 

G9 Inter-Mountain Basins Semi-Desert Grassland 701 5475.0 13529.1 10.3% 2164.7 5349.0 5.7% 60.5% 

G10 

Inter-Mountain Basins Semi-Desert Shrub- 

Steppe 

2199 21530.6 53203.3 40.5% 17007.4 42026.2 44.7% 21.0% 

G11 Inter-Mountain Basins Shale Badland 688 8512.2 21034.2 16.0% 7015.6 17335.9 18.4% 17.6% 

G12 Park Facilities 23 16.8 41.4 0.0% 16.8 41.4 0.0% 0.0% 

G13 Residential 23 2.4 6.0 0.0% 0.1 0.2 0.0% 96.9% 

G14 Southern Colorado Plateau Sand Shrubland 1835 11832.1 29237.7 22.2% 8051.6 19895.9 21.2% 32.0% 

G15 Transportation 55 225.4 557.0 0.4% 145.9 360.5 0.4% 35.3% 

Total 1 6989 53,201.1 131,463.3 38,057.2 94,041.1 

1 




Figure 18. Group map classes for Petrified Forest National Park. 

47


Continued from page 39 

4.2.4 Macrogroup Map Class Accuracy 

and Summary Statistics 


Thirteen macrogroup map classes (fig. 

19; table 17, Appendix F) were created 

by aggregating the base map classes. The 

overall accuracy of the group map classes 

was 73.5%; the kappa index was 62.9%± 

0.02 (table 18, Appendix H3). Colorado 

Plateau Pinyon-Juniper Woodland met 

the 80% standard for both user and 

producer accuracy. Inter-Mountain Basins 

Greasewood Flat, Inter-Mountain Basins 

Riparian Woodland and Shrubland, and 

Inter-Mountain Basins Semi-Desert 

Grassland and Steppe met the 80% 

standard for producer accuracy. Inter- 

Mountain Basins Semi-Desert Grassland 

and Steppe met the standard for user 

accuracy. Colorado Plateau Mixed 

Bedrock and Tableland, Inter-Mountain 

Basins Wash, and Southern Colorado 

Plateau Sand Shrubland were below 80% 

accuracy for both the user and producer 

accuracy. 


The macrogroup map classes consist 

of five non-vegetated types and eight 

vegetative map classes (table 19). Two 

map classes dominate macrogroup view 

of park vegetation: 1) Inter-Mountain 

Basins Semi-Desert Grassland and Steppe 

(68.8%) and 2) Southern Colorado Plateau 

Sand Shrubland (21.2%). 

4.2.5 Management Map Class Accuracy 

and Summary Statistics 


Twenty-four management map classes 

were created by aggregating the base map 

classes (fig. 20; table 20, Appendix F). 

The overall accuracy of the management 

map classes (table 21, Appendix H4) was 

68.6%, with a kappa index of 64.1% and 

standard error of 0.02. Nine non-vegetated 

map classes were not assessed. Four of 

the management map classes met the 

80% standard for both user and producer 

accuracy, and four met the standard for 



The 24 management map classes consist 

of nine non-vegetated classes and 15 

vegetated classes (table 22). The three most 

abundant classes within the park constitute 

nearly 86% of the park vegetation: 

■ Badland Sparse Vegetation (32.4%), 

■ Alkali Sacaton Steppe and Mixed 

Grasslands (32.1%) 

■ Sandsage – Fourwing Saltbush Colorado 

Plateau Shrubland (21.2%) 

4.3 Discussion 

4.3.1 Challenges 

Map class accuracy for PEFO was 

adversely influenced by several factors 

including extensive invasive species, 

vegetation cover and pattern, and the 

quality of the aerial photography. 

Russian thistle (Salsola tragus) is an 

invasive non-native annual forb, which 

responds rapidly to rain during the 

growing season forming ephemeral 

cover. The photointerpreters identified 

polygons dominated by Russian thistle as 

the Russian Thistle Sand Dune Vegetation. 

However, the invasive and annual 

characteristics of this species caused 

problems in consistent identification. For 

example, photointerpretation was often 

based on identification of the landform 

type on which infestations of Russian 

thistle were most evident: sand dunes. 

These dunes may have a predominance 

of native vegetation or some infestation 

of Russian thistle, or may have complete 

type conversion to Russian thistle. Since 

Russian thistle is an annual, degraded 

dunes may appear as bare or with low 

cover of native vegetation during many 

months of the year. 

The Russian thistle dries into a brittle 

skeleton that may blow away or may 

remain for many seasons. The accuracy 

48


Table 17. Cross-walk of macrogroup map classes to base map classes. 

Macrogroup Map Class 


MG1 Agriculture Run-off Control Feature 

Stock Ponds 

MG2 Colorado Plateau Mixed Bedrock and Tableland Cliff-rose - Crispleaf Buckwheat Shrubland 



MG3 Colorado Plateau Pinyon-Juniper Woodland One-seed Juniper / Bigelow’s Sagebrush Shrubland 

MG4 Development Commercial Development 

MG5 Inter-Mountain Basins Active and Stabilized Dune Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation 


MG6 Inter-Mountain Basins Greasewood Flat Greasewood / New Mexico Saltbush Shrubland 



MG7 Inter-Mountain Basins Riparian Woodland and Shrubland Cottonwood / Rubber Rabbitbrush Woodland 



MG8 Inter-Mountain Basins Semi-Desert Grassland and Steppe Alkali Sacaton - Blue Grama Herbaceous Vegetation 




Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 














MG9 Inter-Mountain Basins Wash Barren Wash 






MG10 Park Facilities Park Facilities 

Park Sites 

MG11 Residential Residences 

MG12 Southern Colorado Plateau Sand Shrubland Four-wing Saltbush / Galleta Shrubland 


49



Macrogroup Map Class 


MG13 Transportation Airstrip 

Railroad 

Roads 

Table 18. Accuracy statistics for macrogroup map class. 


Macrogroup Map Class accuracy (range) accuracy (range) 

MG1 Agriculture Not sampled Not sampled 

MG2 Colorado Plateau Mixed Bedrock and Tableland 52.9 41.6 - 64.0 77.1 63.8 - 

86.6 

MG3 Colorado Plateau Pinyon-Juniper Woodland 81.8 57.3 - 93.8 100.0 76.9 - 

100.0 

MG4 Development Not sampled Not sampled Not sampled Not 

sampled 

MG5 Inter-Mountain Basins Active and Stabilized Dune 36.7 26.4 - 48.5 81.8 65.1 - 

92.6 

MG6 Inter-Mountain Basins Greasewood Flat 47.1 36.0 - 58.4 85.7 71.7 - 

93.4 

MG7 Inter-Mountain Basins Riparian Woodland and Shrubland 40.9 25.6 - 58.2 81.8 57.3 - 

93.8 

MG8 Inter-Mountain Basins Semi-Desert Grassland and Steppe 93.0 90.1 - 95.0 77.2 73.3 - 

80.6 

MG9 Inter-Mountain Basins Wash 66.3 57.5 - 73.9 69.4 60.7 - 

76.9 

MG10 Park Facilities Not sampled Not sampled 

MG11 Residential Not sampled Not sampled 

MG12 Southern Colorado Plateau Sand Shrubland 67.8 57.2 - 76.8 56.3 46.6 - 

65.6 

MG13 Transportation Not sampled Not sampled 

1 


50

51 

Table 19. Summary statistics for macrogroup map classes. 


Project area Park area Occurrence 

outside 



% Park 

park 

# Polygons 

Ha Ac cover Ha Ac land cover 

boundaries 

MG1 Agriculture 27 9.3 23.1 0.0% 0.5 1.3 0.0% 94.3% 

MG2 Colorado Plateau Mixed Bedrock and Tableland 90 378.5 935.4 0.7% 260.7 644.1 0.7% 31.1% 

MG3 Colorado Plateau Pinyon-Juniper Woodland 27 211.4 522.3 0.4% 70.8 174.9 0.2% 66.5% 

MG4 Development 6 1.4 3.5 0.0% 0.0 0.0 0.0% 100.0% 

MG5 Inter-Mountain Basins Active and Stabilized Dune 377 1631.0 4030.4 3.1% 946.6 2339.1 2.5% 42.0% 

MG6 Inter-Mountain Basins Greasewood Flat 78 275.8 681.6 0.5% 242.4 599.0 0.6% 12.1% 

MG7 Inter-Mountain Basins Riparian Woodland and Shrubland 76 183.0 452.2 0.3% 66.0 163.0 0.2% 63.9% 

MG8 Inter-Mountain Basins Semi-Desert Grassland and Steppe 3588 35517.9 87766.6 66.8% 26187.7 64711.1 68.8% 26.3% 

MG9 Inter-Mountain Basins Wash 784 2916.1 7205.9 5.5% 2068.4 5111.1 5.4% 29.1% 

MG10 Park Facilities 23 16.8 41.4 0.0% 16.8 41.4 0.0% 0.0% 

MG11 Residential 23 2.4 6.0 0.0% 0.1 0.2 0.0% 96.9% 

MG12 Southern Colorado Plateau Sand Shrubland 1835 11832.1 29237.7 22.2% 8051.6 19895.9 21.2% 32.0% 

MG13 Transportation 55 225.4 557.0 0.4% 145.9 360.5 0.4% 35.3% 

Total 1 6989 53,201.2 131,463.1 38,057.5 94,041.9 

1 


Accuracy Assessment and Additional Map Classes


Figure 19. Macrogroup map classes for Petrified Forest National Park. 

52


Table 20. Cross-walk of management to base map classes. 

Management Map class 

MN1 Airstrip Airstrip 

Base Map class 

MN2 Alkali Sacaton Steppe and Mixed Grasslands Alkali Sacaton - Blue Grama Herbaceous Vegetation 






Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation 



MN3 Badland Sparse Vegetation Arizona Siltbush Sparse Vegetation 



MN4 Barren Wash Barren Wash 

MN5 Blue Grama Steppe and Mixed Grasslands Blue Grama - Galleta Herbaceous Vegetation 



MN6 Blue Sage Dwarf-shrubland Blue Sage Dwarf-shrubland 

MN7 Cliff-rose - Crispleaf Buckwheat Shrubland Cliff-rose - Crispleaf Buckwheat Shrubland 

MN8 Commercial Development Commercial Development 

MN9 Cottonwood / Rubber Rabbitbrush Woodland Cottonwood / Rubber Rabbitbrush Woodland 

MN10 Coyote Willow Shrubland Coyote Willow Shrubland 

MN11 Greasewood Flats Greasewood / New Mexico Saltbush Shrubland 



MN12 One-seed Juniper / Bigelow’s Sagebrush Shrubland One-seed Juniper / Bigelow’s Sagebrush Shrubland 

MN13 Park Facilities Park Facilities 

MN14 Park Sites Park Sites 

MN15 Railroad Railroad 

MN16 Residences Residences 

MN17 Roads Roads 

MN18 Run-off Control Feature Run-off Control Feature 

MN19 Russian Thistle Sand Dune Vegetation Russian Thistle Sand Dune Vegetation 

MN20 Sand / Mudflat Sand 

MN21 Sandsage - Fourwing Saltbush Colorado Plateau Shru- Four-wing Saltbush / Galleta Shrubland 



MN22 Stock Ponds Stock Ponds 

MN23 Vegetated Rim Complex Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 




53



Management Map Class 


MN24 Vegetated Wash Complex Copperweed / Alkali Sacaton Shrubland 






Table 21. Accuracy assessment statistics for management map classes. 


Management Map Class accuracy (range) accuracy (range) 

MN1 Airstrip Not sampled Not sampled 

MN2 Alkali Sacaton Steppe and Mixed Grasslands 73.0 66.9 - 78.3 64.0 58.0 - 69.5 

MN3 Badland Sparse Vegetation 71.0 62.7 - 78.0 72.5 64.6 - 79.5 

MN4 Barren Wash 70.8 54.1 - 83.3 85.0 67.8 - 93.8 

MN5 Blue Grama Steppe and Mixed Grasslands 40.0 22.3 - 60.7 27.3 14.8 - 44.7 

MN6 Blue Sage Dwarf-shrubland 100.0 68.9 - 100.0 100.0 68.9 - 100.0 

MN7 Cliff-rose - Crispleaf Buckwheat Shrubland 66.7 43.1 - 84.1 88.9 62.3 - 97.5 

MN8 Commercial Development Not sampled Not sampled 

MN9 Cottonwood / Rubber Rabbitbrush Woodland 100.0 42.5 - 100.0 66.7 25.4 - 92.2 

MN10 Coyote Willow Shrubland 100.0 27.0 - 100.0 100.0 27.0 - 100.0 

MN11 Greasewood Flats 47.1 36.0 - 58.4 85.7 71.7 - 93.4 

MN12 One-seed Juniper / Bigelow’s Sagebrush Shrubland 81.8 57.3 - 93.8 100.0 76.9 - 100.0 

MN13 Park Facilities Not sampled Not sampled 

MN14 Park Sites Not sampled Not sampled 

MN15 Railroad Not sampled Not sampled 

MN16 Residences Not sampled Not sampled 

MN17 Roads Not sampled Not sampled 

MN18 Run-off Control Feature Not sampled Not sampled 

MN19 Russian Thistle Sand Dune Vegetation 50.0 32.7 - 67.3 55.6 36.9 - 72.8 

MN20 Sand / Mudflat 100.0 42.5 - 100.0 100.0 42.5 - 100.0 

MN21 Sandsage - Fourwing Saltbush Colorado Plateau Shrubland 67.8 57.3 - 76.8 55.6 45.9 - 64.8 

MN22 Stock Ponds 

MN23 Vegetated Rim Complex 72.4 63.9 - 79.5 77.8 69.0 - 84.2 

MN24 Vegetation Wash Complex 70.2 61.5 - 77.7 80.8 72.2 - 87.2 

1 


54


Figure 20. Management map classes for Petrified Forest National Park. 

55

56 

Table 22. Summary statistics for management map classes. 

Management Map Class 


# Polygons Ha Ac 

Park area 


land cover Ha Ac 

% park 


cover 

Outside 

park 

boundaries 

MN1 Airstrip 1 2.6 6.5 0.0% 0.0% 100.0% 

MN2 Alkali Sacaton Steppe and Mixed Grasslands 1740 17684.9 43700.3 33.2% 12224.6 30207.6 32.1% 30.9% 

MN3 Badland Sparse Vegetation 1423 15088.2 37283.7 28.4% 12327.7 30462.5 32.4% 18.3% 

MN4 Barren Wash 47 498.7 1232.4 0.9% 319.4 789.1 0.8% 36.0% 

MN5 Blue Grama Steppe and Mixed Grasslands 60 808.2 1997.0 1.5% 181.5 448.6 0.5% 77.5% 

MN6 Blue Sage Dwarf-shrubland 12 122.8 303.5 0.2% 69.2 171.0 0.2% 43.7% 

MN7 Cliff-rose - Crispleaf Buckwheat Shrubland 11 57.1 141.1 0.1% 57.1 141.1 0.2% 0.0% 

MN8 Commercial Development 6 1.4 3.5 0.0% 0.0 0.0 0.0% 100.0% 

MN9 Cottonwood / Rubber Rabbitbrush Woodland 11 15.2 37.6 0.0% 1.7 4.3 0.0% 88.5% 

MN10 Coyote Willow Shrubland 6 13.2 32.5 0.0% 2.2 5.4 0.0% 83.4% 

MN11 Greasewood Flats 78 275.8 681.6 0.5% 242.4 599.0 0.6% 12.1% 

MN12 One-seed Juniper / Bigelow’s Sagebrush Shrubland 27 211.4 522.3 0.4% 70.8 174.9 0.2% 66.5% 

MN13 Park Facilities 21 16.0 39.5 0.0% 16.0 39.5 0.0% 0.0% 

MN14 Park Sites 2 0.8 1.9 0.0% 0.8 1.9 0.0% 0.0% 

MN15 Railroad 2 5.2 12.9 0.0% 2.3 5.7 0.0% 56.0% 

MN16 Residences 23 2.4 6.0 0.0% 0.1 0.2 0.0% 96.9% 

MN17 Roads 52 217.6 537.6 0.4% 143.6 354.9 0.4% 34.0% 

MN18 Run-off Control Feature 2 0.5 1.3 0.0% 0.5 1.3 0.0% 0.0% 

MN19 Russian Thistle Sand Dune Vegetation 39 100.7 248.9 0.2% 95.9 236.9 0.3% 4.8% 

MN20 Sand / Mudflat 2 2.8 6.9 0.0% 2.8 6.9 0.0% 0.0% 

MN21 

Sandsage - Fourwing Saltbush Colorado Plateau 


1835 11832.1 29237.7 22.2% 8051.6 19895.9 21.2% 32.0% 

MN22 Stock Ponds 25 8.8 21.8 0.0% 0.0% 100.0% 

MN23 Vegetated Rim Complex 768 3662.8 9051.0 6.9% 2436.1 6019.8 6.4% 33.5% 

MN24 Vegetated Wash Complex 796 2572.0 6355.6 4.8% 1811.1 4475.3 4.8% 29.6% 

Total 1 6989 53,201.2 131,463.1 38,057.4 94,041.8 

1 




assessment crew, who sampled in the 

fall following a drier summer monsoon 

season, often found these skeletons on 

sand dunes and were instructed to assess 

the underlying vegetation. Summer 

monsoon rainfall in 2005, the year before 

accuracy assessment, had resulted in 

prolific growth of Russian thistle where it 

occurred in the seed bank. The skeletons 

that the accuracy assessment crew viewed 

probably remained from that infestation 

event. Half of the polygons mapped as 


were assessed in the field as another 

map class; however, Russian thistle was 

commonly found at these sites. Conversely, 

polygons in the field identified as Russian 

Thistle Sand Dune Vegetation in the 

photointerpretation frequently supported 

native vegetation and were field identified 

as Rubber Rabbitbrush / Blue Grama 

Shrub Herbaceous Vegetation or Fourwing 

Saltbush / Galleta Shrubland. 

The vegetation at PEFO has few distinct 

boundaries between types, particularly 

those types that are composed of grasses 

with shrubs. There is a gradient in grass 

cover as well as shrub cover. The grass 

species and the shrub species are not 

readily distinguishable using aerial 

photography; in fact, some species are not 

even readily distinguishable even when 

you are beside the species in the field. 

Compounding this is the mosaic pattern 

that often occurs with shrub distribution. 

The cover of shrubs can vary at a grain 

finer than the minimum-mapping unit 

(.5 ha). These mosaics of varying shrub 

density make the assignment of map 

classes diffcult between the field and a 

photo-interpretation assessment. This 

results in field assessments that may be 

based on dominant species cover whereas 

the photo-interpretation assessments 

might be based on diagnostic or indicator 

species as the only distinguishable 

community characteristic on the aerial 

photo. 

Sparse vegetation at PEFO is often so 

sparse that indicator species used to 

distinguish the community may not be 

apparent during accuracy assessment but 

may still be present in the map polygon. 

Frequently vegetation at PEFO, even 

in the more densely vegetated areas, 

has less than 25% cover. This makes it 

diffcult to determine on the ground as 

well as from the aerial photo when a 

species is co-dominant or dominant since 

the determination relies on assessing 

relative differences of less than 5% 

cover. Patchiness in vegetation cover, as 

discussed above, further confounds the 

determination. The accuracy-assessment 

field team assessed a minimum mapping 

unit within the polygon whereas the 

photointerpreter delineated the entire 

polygon. 

The vegetation at PEFO displays a 

surprising amount of variability in 

appearance, considering that it is largely 

composed of perennial shrubs and grasses. 

When dormant, grasses are brown and 

diminished in volume compared to their 

non-dormant aspect. Shrubs also can lose 

leaves and fade in color during drought. 

Variation in annual rainfall and variation in 

the seasonal timing and amounts of winter, 

spring and summer monsoonal rains 

greatly influence the visual aspect of the 

PEFO vegetation. These climatic factors 

influenced the ground appearance of the 

plant communities during the fieldwork 

of 1996 and 2003, the photointerpretation 

data collection in 2004-2006, and the 

accuracy-assessment data collection in 

2006. Additionally, the photointerpretation 

team was mapping conditions present on 

aerial photography acquired earlier than 

the field observations, which introduces 

some potential of a mismatch between 

ground conditions and the imagery. These 

changes are diffcult to account for in the 

development of the map and in assessing 

the map accuracy. 

The photosignatures of some map 

classes, such as in the badlands, were 

masked by the strong spectral signature 

of bare soil. Where this happened, the 

57


photointerpreters often used landform 

signatures to map the vegetation rather 

than vegetation signatures. Grasslands 

with mixed grass species were also diffcult 

to interpret due to the similarity in the tone 

and texture of the different grass species. 

The communities with similar grass 

compositions were diffcult to pick out 

on the photography as unique vegetation 

communities. 

distribution, and mapping projects to 

conduct activities related to resource 

management, environmental compliance, 

planning (locating new features), fire 

management planning, habitat modeling, 

education and interpretation, inventory 

and monitoring (placement of sample 

sites), research, and cooperative work with 

adjacent land owners. 

However, the accuracy assessment 

metrics presented here allow a user of the 

vegetation map database to evaluate the 

performance of each map-class schema. 

Additional information can be gained on 

the sources of confusion between the map 

classes using the contingency tables in 

Appendix H. 

Ancillary products related to accuracy 

assessment include Appendix D (all field 

species including those identified within 

accuracy-assessment observation sites) 

and Appendix E (field sheets used for 

observations). 

4.3.2 Uses and Limitations of the 

Vegetation Map Database and Affiliated 

Products 

The vegetation map database provides four 

representations of the PEFO vegetation. 

The finest thematic resolution, represented 

by the base map classes, offers the best 

spatial detail with the lowest accuracy. The 


classes represent the vegetation at coarser 

thematic resolution but with greater 

accuracy. Each representation provides 

information, and the representation 

chosen for any particular objective 

should be evaluated using the accuracy 

assessment and summary statistics tables 

provided in this report. 

The vegetation map database and ancillary 

products produced during the project can 

provide both background and direct input 

to a number of park and SCPN activities. 

Other national park units have used 

products from vegetation classification, 

58

5 Literature Cited 

Agresti, A. and B. A. Coull. 1998. Approximate 

is better than ‘exact’ for interval estimation 

of binomial parameters. The American 

Statistician. 52:119-126. 

Anderson. J., E. Hardy, J. Roach, and R. Witmer. 

1976. A land use and land cover 

classification system for use with remote 

sensor data. Geological Survey Professional 

paper 964. U.S. Government 

Printing Offce. Washington, D.C. 

Bailey, R. G., P. E. Avers, T. King, and W. H. 

McNab, editors. 1994. Ecoregions and 

subregions of the United States (map). 

Washington, D.C.: USDA Forest Service. 

1:7,500,000. With supplementary table 

of polygon descriptions, compiled and 

edited by W. H. McNab and R. G. Bailey. 

Barnes, W. C. 1913. Western grazing grounds 

and forest ranges: A history of the livestock 

industry as conducted on the open 

ranges of the arid West, with particular 

reference to the use now being made 

of the ranges in the national forests. 

Breeder’s Gazette, Chicago, Illinois. 

Belnap, J. and O. L. Lange. (Eds). 2001. Biological 

soil crusts: Structure, function, and 

management. Springer-Verlag Berlin 

Hedelberg 

Bolton, H.E. (ed.). 1930. Spanish explorations 

in the Southwest, 1542-1706. Scribner’s 

Sons, New York. 

Chronic, H. 1986. Pages of Stone, Geology of 

Western National Parks & Monuments, 

4: The Desert Southwest. The Mountaineers, 

Seattle, Washington. 

Comer, P., D. Faber-Langendoen, R. Evens, S. 

Gawler, C. Josse, G. Kittel, S. Menard, M. 

Pyne, M. Reid, K. Schulz, K. Snow and J. 

Teague. 2003. Ecological systems of the 

United States: A Working Classification 

of U.S. Terrestrial Systems. NatureServe, 

Arlington, Virginia. 

Cordell, L. 1997. Archaeology of the Southwest. 

Academic Press, Inc. New York. 

Cully, A. C. and J. F. Cully, Jr. 1989. Spatial and 

temporal variability in perennial and 

annual vegetation at Chaco Canyon, 

New Mexico. Great Basin Naturalist 

49(1):123-122. 

Decker, K. and J. Coles. 2003. Preliminary vegetation 

classification for Arches National 

Park. Draft Report by Engineering- 

Environmental Management, Inc. and 

Colorado Natural Heritage Program for 

the National Park Service. 

Driscoll, R. S., D. L. Merkel, D. L. Radloff, D. 

E. Synder, and J. S. Hagihara. 1984. An 

ecological land classification framework 

for the United States. U.S. Forest Service 

Miscellaneous Publication 1439. U.S. 

Forest Service, Washington, D.C. 

Dufrêne, M. and P. Legendre. 1997. Species 

assemblages and indicator species: The 

need for a flexible asymmetrical approach. 

Ecological Monographs 67: 3: 

345-66. 

Environmental Systems Research Institute, 

National Center for Geographic Information 

and Analysis, and The Nature 

Conservancy. 1994. Accuracy assessment 

procedures. NBS/NPS Vegetation 

Mapping Program. Report to U.S. 

Department of Interior National Biological 

Survey and National Park Service. 

Available: http://biology.usgs.gov/npsveg/ 

aa/index.html 

Federal Geographic Data Committee. 1997. 

Vegetation classification standard. Available: 

http://www.fgdc.gov/standards/ 

projects/FGDC-standards-projects/vegetation/vegclass.pdf 

Federal Geographic Data Committee 2008. 

National Vegetation Classification Standard, 

Version 2. http://www.fgdc.gov/ 

standards/projects/FGDC-standards- 

projects/vegetation/NVCS_V2_FI- 

NAL_2008-02.pdf 

Foody, G. M. 1992. Classification accuracy assessment: 

some alternatives to the kappa 

coeffcient for nominal and ordinal level 

classifications. Remote Sensing from 

Research to Operation. Nottingham, 

Remote Sensing Society. 

Grossman, D. H., D. Faber-Langendoen, A.S. 

Weakley, M. Anderson, P. Bourgeron, 

R. Crawford, K. Goodin, S. Landaal, K. 

Metzler, K. D. Patterson, M. Pyne, M. 

Reid and L. Sneddon. 1998. International 

Classification of Ecological Communi- 

59

Literature Cited 

ties: Terrestrial Vegetation of the United 

States. Volume I: The National Vegetation 

Classification Standard. The Nature 

Conservancy. Arlington, Virginia. 

Hamilton, P. 1883. The resources of Arizona; 

its mineral, farming, grazing, and timberlands; 

its history, climate and productions, 

civil and military government, prehistoric 

ruins, early missionaries, Indian 

tribes, pioneer days, etc. A. L. Bancroft 

and Company, San Francisco, California. 

Kartesz, J. and A. Farstad. 1999. Multi-scale 

analysis of endemism of vascular plant 

species. In Terrestrial ecoregions of 

North America: A conservation assessment. 

In: T.H. Ricketts, E. Dinerstein, 

D.M. Olson, and C. Loucks, pp. 51-55. 

Island Press, Washington, D.C . 

McCune, B., and M. J. Mefford. 1999. PC- 

ORD. Multivariate analysis of ecological 

data, ver. 4. MjM Software Design. 

Gleneden Beach, Oregon. 

McCune, B. and J. B. Grace. 2002. Analysis of 

ecological communities. MjM Software 

Design. Gleneden Beach, Oregon. 

Mueller-Dombois, D. and H. Ellenburg. 2002. 

Aims and methods of vegetation ecology. 

The Blackburn Press. New Jersey. 

National Park Service (NPS). 1999. Natural 

Resource Challenge: The National Park 

Service’s action plan for preserving natural 

resources. In-house publication. U.S. 

Department of Interior, National Park 

Service, Washington, D.C. 

National Park Service. 2004. Final General 

Management Plan Revision/Environmental 

Impact Statement. Petrified Forest 

National Park, Arizona. 

NatureServe Explorer. 2009. Classification of 

Standard Ecological Units, V 7.1. Available 

at: http://www.natureserve.org/explorer/ 

classeco.htm#vegetationClass. 

Accessed April 30, 2009. 

The Nature Conservancy and Environmental 

Systems Research Institute. 1994a. Standardized 

national vegetation classification 

system. Report to U.S. Department 

of Interior National Biological Survey 

and National Park Service. Available: 

http://biology.usgs.gov/npsveg/classification/index.html. 


Systems Research Institute, 1994b. Field 

methods for vegetation mapping: NBS/ 

NPS Vegetation Mapping Program (Final 

Draft). Report to U.S. Department of 

Interior National Biological Survey and 

National Park Service. Available: http:// 

biology.usgs.gov/npsveg/fieldmethods/ 

index.html. 


Systems Research Institute. 1996. 

Methodology for assessing the utility of 

existing data for vegetation mapping. 

Report to U.S. Department of Interior 

national Biological Survey and National 

Park Service. Available: http://biology. 

usgs.gov/npsveg/existdata/index.html. 

Thomas, K. A., M. Hansen, and C. Seeger. 

2003. Part I. Vegetation of Petrified 

Forest National Park, Arizona. Report 

on file, Petrified Forest National Park, 

Arizona. 

Thomas, L. P., M. N. Hendrie (editor), C. L. 

Lauver, , S. A. Monroe, N. J.Tancreto, S. 

L. Garmin, and M. E. Miller. 2006. Vital 

Signs Monitoring Plan for the Southern 

Colorado Plateau Network. Natural Resource 

Report NPS/SCPN/NRR-2006- 

002. National Park Service. 

UNESCO. 1973. International classification 

and mapping of vegetation. Paris, 

UNESCO. 

Young, R. W. 1968. The role of the Navajo in 

the Southwest drama. The Gallup Independent 

and Robert W. Young. 

Pyne, S. J. 1982. Fire in America :A cultural history 

of wildland and rural fire. Princeton 

University Press, Princeton, New Jersey. 

Sheridan, T. E. 1995. Arizona: A history. University 

of Arizona Press. Tucson, Arizona. 

60

Glossary 

Glossary modified from USGS-NPS 

Vegetation Mapping Program: http:// 

biology.usgs.gov/npsveg/glossary.html. 

Accuracy: The closeness of results of 

observations, computations, or estimates 

to the true values or to values that are 

accepted as being true (Rabchevsky 1984). 

In the USGS-NPS Vegetation Mapping 

Program there are two aspects of accuracy: 

thematic and positional accuracy. 

Accuracy assessment: The process of 

determining the positional and thematic 

accuracy of the spatial vegetation 

community data. This is an independent 

process performed after the vegetation 

mapping and classification is complete. 

Accuracy assessment point: A location 

where accuracy assessment data are 

collected. 

Aerial photography: Analog imagery 

taken from an airplane. The optical axis 

is oriented perpendicular to the earth’s 

surface so that the film is parallel to the 

surface being photographed. (also Vertical 

Aerial Photography). A sequence of aerial 

photographs will overlap so the photos 

can be used in stereoscopic analysis 

(stereo pairs). The overlap is referred to as 

“endlap” (top-to-bottom area in common, 

same flightline) and “sidelap” (side-toside 

area in common, different flightlines) 

(portions from Rabchevsky 1984). Aerial 

photography used in the program is 9 × 

9-inch vertical, stereoscopic, color or color 

infrared photography. 

Alliance: A physiognomically uniform 

group of associations sharing one or 

more diagnostic (dominant, differential, 

indicator, or character) species that, as a 

rule, are found in the uppermost stratum 

of the vegetation (FGDC 1997). This is 

the second-finest level in the National 

Vegetation Classification Standard 

hierarchy. See the table under USNVC. 

Anderson Classification System: A 

land cover/land use classification system 

developed for use with remote sensing 

systems in the 1970s adopted for the 


to map cultural land cover (Anderson et al. 

1976); see below. 

Anderson Classification System. 

Level I 

Urban.or.Built-up. 

Land 

Agricultural.Land 

Water.(nonvegetated.portion) 

Barren.Land 

Perennial.Snow.or. 

Ice 

Level II 

Residential 

Commercial and Services 

Industrial 

Transportation, Communications, 

and Utilities 

Industrial and Commercial 

Complexes 

Mixed Urban or Built-up 


Other Urban or Built-up 


Cropland and Pasture 

Orchard, Groves, Vineyards, 

Nurseries, and 

Ornamental Horticultural 

Areas 

Confined Feeding Operations 

Other Agricultural Lands 

Streams and Canals 

Lakes 

Reservoirs 

Bays and Estuaries 

Dry Salt Flats 

Beaches 

Sandy Areas other than 

Beaches 

Strip Mines, Quarries, and 

Gravel Pits 

Transitional Areas 

Mixed Barren Lands 

Perennial Snowfields 

Glaciers 

Note: This is not the complete Anderson Level II Classification. 

Areas of natural vegetation are classified under the NVCS. 

Association: The finest level of the 


Standard. The association is a 

physiognomically uniform group of 

vegetation stands that share one or 

more diagnostic (dominant, differential, 

61


indicator, or character) overstory and 

understory species. These elements occur 

as repeatable patterns of assemblages 

across the landscape, and are generally 

found under similar habitat conditions 

(FGDC 1997). See table under USNVC an 

example. Within the program association 

is the preferred term, but it is also 

synonymous with community, community 

type, plant community, type, vegetation 

community, and vegetation type. 

Attribute: (digital data) A numeric, text, 

or image data field in a relational database 

table (such as a GIS) that describes a 

spatial feature (point, line, polygon, cell) 

(ESRI 1994). 

Automate: The process of entering 

data into a computer. Synonymous with 

digitize. 

Base map: The source or control from 

which all spatial data are developed and 

geo-referenced to. Photo interpreted data 

are transferred to a base to rectify and 

register the data. For this program, base 

maps consist of USGS DOQQs or specially 

made orthophotos. 

Class: The level in the National Vegetation 

Classification Standard hierarchy based 

on the structure of the vegetation and 

determined by the relative percentage 

of cover and the height of the dominant, 

uppermost life forms (Grossman et al. 

1998). See the table under USNVC. 

Classification accuracy: How closely 

the map classes match the vegetation 

communities found on the landscape. This 

is determined by accuracy assessment 

protocols. See “Producing rigorous 

and consistent accuracy assessment 

procedures” at http://biology.usgs. 

gov/npsveg/aa/index.html for more 

information. Also see producer and user 

accuracy. 

Community: An assemblage of species 

that co-occur in defined areas at certain 

times and have the potential to interact 

with one anther (Grossman et al. 1998). 

May also refer to an association in the 

USNVC, but this is not preferred. 

Contingency table: A table that 

compares mapped data with ground data 

to determine accuracy. The “known” 

classes derived from accuracy assessment 

plots are compared to the classes 

derived from photo interpretation. The 

results are then tabulated in the form 

of a contingency table to determine 

the degree of misclassification that has 

occurred between classes. Also referred 

to as error matrix, confusion matrix, or 

misclassification matrix. For an example of 

a contingency table see http://biology.usgs. 

gov/npsveg/scbl/aa_matrix.html. 

Cover: The area of ground covered by 

the vertical projection of the aerial parts 

of plants of one or more species.(FGDC 

1997). 

Cover type: A designation based upon 

the plant species forming a plurality of 

composition within a given area (e.g., 

Oak–Hickory) (FGDC 1977). Also refers 

to an alliance or group of alliances in the 

USNVC. 

Coverage: A file format used by Arc/Info 

software for vector spatial data. 

Crosswalk: Relationship between the 

elements of two classification systems. 

For example, there is a crosswalk between 

map classes and units of the NVCS. This 

relationship is often shown in a look up 

table. 

Datum: A mathematical model that 

describes the size and shape of the 

ellipsoid. The earth is not a sphere, but an 

ellipsoid distorted by rotation about its 

axis, with the globe bulging at the equator 

and flattened at the poles. The flattening 

is not uniform around the Earth due to 

the influence of the continents location 

(Snyder 1982). Using the wrong datum 

in relation to geographic coordinates can 

result in errors of hundreds of meters in 

position. This Program uses the North 

American Datum (NAD) of 1983 or 

NAD83. 

62

Glossary 

Density: The relationship between 

the area covered by the overstory of a 

vegetation community and the total area 

of a polygon in which the community is 

found. One of the physiognomic modifiers 

classified in the USGS-NPS Vegetation 

Mapping Program. Density in map units 

is classified as Closed/Continuous >60 

%, Discontinuous 40–60%, Dispersed 

25–40%, Sparse 10–25%, Rare 2–10%. 

Compare with pattern and height. 

Dichotomous field key: A document 

that identifies vegetation communities 

on the basis of exclusive characteristics. 

An example of exclusive characteristics is 

forested versus non-forested. Also known 

as vegetation field key and vegetation 

key. This key is an important product of 

each vegetation-mapping project. For an 

example of a dichotomous field key visit 

http://biology.usgs.gov/npsveg/agfo/report. 

pdf#vegkey. 

Digital Orthophoto Quarter Quadrangle 

(DOQQ): USGS digital product derived 

from high altitude aerial photography. 

These digital images are rectified and 

registered to locations on the earth and 

cover approximately one quarter of 

a 7.5-minute quadrangle. Also called 

3.75-minute DOQ. DOQs are often used as 

base maps to register the photo interpreted 

data in this program. 

Digitize: The process of entering data into 

a computer. There are several methods 

of entering spatial data into a computer 

including manual digitizing, scan digitizing, 

and soft copy photogrammetric methods. 

Synonymous with automate. 

Division: The highest level in the NVCS 

separating Earth cover into either 

vegetated or non-vegetated categories 

(FGDC 1997). See table under USNVC. 

Dominance: The extent to which a given 

species or life form predominates in a 

community because of its size, abundance 

or cover, and affects the fitness of 

associated species (FGDC 1997). 

Error: The distance of results of 

observations, computations, or estimates 

from the true values or to values that are 

accepted as being true. Also refers to the 

misclassification of thematic data. Contrast 

with accuracy. 

Error matrix: See contingency table. 


(FGDC): Coordinates the development of 

the National Spatial Data Infrastructure 

(NSDI). The NSDI encompasses 

policies, standards, and procedures for 

organizations to cooperatively produce 

and share geographic data. The 17 federal 

agencies that make up the FGDC are 

developing the NSDI in cooperation with 

organizations from state, local and tribal 

governments, the academic community, 

and the private sector. The program 

complies with FGDC standards for 

vegetation classification, metadata, spatial 

data transfer, and positional accuracy. 

Field reconnaissance: Preliminary 

field visits by photo interpreters and 

vegetation classification experts to gain 

an overview of the vegetation of the 

project area and how it relates to the 

NVCS. Communication between photo 

interpreters and vegetation classification 

experts during this fieldwork is key to 

developing an accurate classification 

system. Observation point data are 

collected during this reconnaissance. 

Field verification: Field visits by photo 

interpreters after photo interpretation is 

complete to check for correctness of photo 

interpretation. At this point changes may 

be made to the photo interpretation. This 

occurs prior to accuracy assessment. 

Flight line: Refers to a line or strip of 

aerial photography. Usually designated 

on the film as “flightline number – photo 

number”. Technical: A line connecting 

the principal points of sequential vertical 

aerial photographs (portions from 

Rabchevsky 1984) 

Floristics: The kinds and number of 

plant species in particular areas and their 

distribution. 

63


64 

Formation: A level in the National 


hierarchy below subgroup which 

represents vegetation types that share a 

definite physiognomy or structure within 

broadly defined environmental factors, 

relative landscape positions, or hydrologic 

regimes (Grossman et al. 1998). See table 

under USNVC. 

Geographic Information System (GIS): 

An organized collection of geographically 

(spatially) referenced information 

(portions from ESRI 1994). 

Georeference: The process of converting a 

map or image into real-world coordinates. 

A non-georeferenced map or image is said 

to be in “digitizer-inches” or “scannerinches,” 

that is, it has no real-world 

coordinates. 

Global Positioning System (GPS): A 

system of satellites, ground receiving 

stations and handheld receivers that 

allow accurate measurement of feature 

coordinates on the face of the earth. GPS 

receivers are used to measure the location 

of field plots, reconnaissance points, and 

accuracy assessment points. 

Ground truth: The process of taking aerial 

photographs into the field to verify the 

ground condition compared to how that 

condition appears in the photograph. 

Group: The level in the National 


hierarchy below subclass based on 

leaf characteristics and identified and 

named in conjunction with broadly 

defined macroclimatic types to provide 

a structural-geographic orientation 

(Grossman et al. 1998). See table under 

USNVC. 

Habitat: The combination of 

environmental or site conditions and 

ecological processes influencing a plant 

community. 

Habitat type: (1) a collective term for all 

parts of the land surface supporting, or 

capable of supporting, the same kind of 

climax plant association (Daubenmire 

1978); (2) an aggregation of land areas 

having a narrow range of environmental 

variation and capable of supporting a 

given plant association (Gabriel and Talbot 

1984). 

Hectare: A metric unit of measure equal to 

10,000 m 2 , or approximately 2.471 acres. 

Height: Height of the overstory of 

a vegetation community. One of the 

physiognomic modifiers classified in the 

USGS-NPS Vegetation Mapping Program. 

Height in map units is classified as 50 

meters. Compare with density and pattern. 

Integrated Taxonomic Information 

System (ITIS): A comprehensive, 

standardized reference for the scientific 

names, and synonyms and common 

names, for all the plants and animals 

and other biological organisms of 

North America and the surrounding 

oceans developed and maintained by an 

international partnership among agencies, 

organizations, and taxonomic specialists. 

This database is accessible over the 

Internet and is used by scientists, resource 

managers, educators and students, 

museum curators, conservationists, and 

the interested public. The USDA PLANTS 

database (http://plants.usda.gov/) is an 

important ITIS partner providing plant 

taxonomic information to ITIS (http:// 

www.itis.gov/). 

Land cover classification: A classification 

of the cultural, physical, and vegetation 

features that cover the earth, commonly 

used with remote sensing technology. 

Vegetation classification is a subset of land 

cover classification. 

Land use classification: A classification of 

the earth’s surface that defines the use that 

people are making of the land, commonly 

used with remote sensing technology, 

and commonly combined with land cover 

classification. Natural vegetation areas may 

be classified as “vacant” or “forest,” or 

“grazing”.

Glossary 

Land use/Land cover classification: A 

combination of a land use classification 

and land cover classification where the 

land use classification is used to classify 

areas that are under a definite land use, 

such as agriculture, residential, or mining. 

The land cover classification is used to 

classify lands that that do not have definite 

land use, such as areas of bare rock, snow 

and ice, or open water. The Anderson 

Classification System is a land cover and 

land use classification. 

Look-up table: A computer file that 

relates the elements of one classification 

to another in a crosswalk. The values 

of a map classification are related to the 

associations of the NVCS in a park project. 

Map accuracy: A measure of the 

maximum errors permitted in horizontal 

positions and elevations shown on maps. 

The National Map Accuracy Standard 

of the USGS at 1:24,000 scale is the map 

accuracy standard for the program. This 

standard is that 90% of well-defined 

objects should appear within 40 feet (12.2 

meters) of their true location. See United 

States National Map Accuracy Standards. 

Map attribute: Collectively the map class 

(or map unit) code, the physiognomic 

modifier codes, and special modifiers 

if they are used: map unit code is that 

portion of the map attribute code defining 

the map unit (e.g., AB) the physiognomic 

modifier code portion of map attribute 

code defining the vegetation community’s 

structure (e.g. -1A3). The map attribute 

code is thus AB-1A3. 

Map class: The vegetation units that can 

be discerned on an aerial photograph. 

Often associations in an alliance cannot 

be distinguished on an aerial photograph 

because the differences are found in 

the understory, so map classes must 

be developed. For example, at Devils 

Tower National Monument, there were 

five associations in the Ponderosa Pine 

Woodland Alliance, but it was necessary 

to create two ponderosa pine map classes 

because the associations could not be 

distinguished on the photography. Map 

classes may be complexes or mosaics of 

associations or map classes may also be 

the same as an association if that can be 

discerned on the photograph. Also known 

as map unit. 

Map unit: See map class. 

Map validation: The process of 

field checking and updating photo 

interpretation. This step is completed prior 

to accuracy assessment. 

Metadata: Data about data. Metadata 

describes the content, quality, condition, 

and other characteristics of data. Its 

purpose is to help organize and maintain 

a organization’s internal investment 

in spatial data, provide information 

about an organization’s data holdings 

to data catalogues, clearinghouses, and 

brokerages, and provide information 

to process and interpret data received 

through a transfer from an external source 

(FGDC 1997). The FGDC sets standards 

for metadata content and structure. 

Minimum Mapping Unit (MMU): The 

smallest area that will be consistently 

delineated during photo interpretation. 

The MMU for the USGS-NPS Vegetation 

Mapping Program is 0.5 hectares. 


Standard (NVCS): The Federal 

Geographic Data Committee’s vegetation 

classification standard. It has been adopted 

to the formation level (as of June 2001); 

adoption of the floristic levels is pending. It 

is based on the Association for Biodiversity 

Information’s United States National 

Vegetation Classification (USNVC) system. 

See table under USNVC for comparison 

and crosswalk. 

NatureServe Explorer: A website 

managed by NatureServe that provides 

authoritative conservation information 

in a searchable database for more than 

50,000 plants, animals, and ecological 

communities in the U.S. and Canada. 

Vegetation community data developed 

by the USGS-NPS Program is available 

65


66 

on NatureServe (URL is http://www. 

natureserveexplorer.org/). 

North American Datum (NAD): 

The datum for map projections and 

coordinates throughout North America 

(see also datum). Usually associated with 

a version, such as 1927 or 1983. This 

program uses the 1983 datum (NAD83), 

which is consistent with satellite location 

systems. The 1983 datum uses the GRS 80 

spheroid whereas the 1927 datum uses the 

Clarke 1866 spheroid (portions from ESRI 

1994). 

Observation point: A field location point 

used to support map unit and vegetation 

classification development. These points 

are collected during reconnaissance and 

the mappers’ subsequent fieldwork. 

Order: The second-highest level in the 

NVCS hierarchy under Division. The 

orders within the Vegetated Division are 

generally defined by dominant life form 

(tree, shrub, dwarf shrub, herbaceous, or 

non-vascular). (FGDC 1997). See table 

under USNVC. 

Ortho image: An aerial photograph that 

has had the distortions due to camera 

lens, topographic relief, tilt of the aircraft, 

and other factors common to aerial 

photography removed and has been 

registered to locations on the earth. A 

digital ortho image can be placed in a GIS 

and have other layers, such as vegetation, 

overlain on it. Aerial photo interpretation 

can also be registered to an ortho image in 

the process of registering and automating 

the data into a GIS. A DOQ is a digital 

ortho image covering 3.75 minutes by 3.75 

minutes of the earth’s surface. 

Pattern: Configuration of vegetation 

features or across a landscape. One of 

the physiognomic modifiers classified 

in the USGS-NPS Vegetation Mapping 

Program. Pattern in map units is classified 

as Evenly Dispersed, Clumped/Bunched, 

Gradational/Transitional, Alternating. 

Compare with density and height. 

Photo interpretation: The art and science 

of identifying and delineating objects on 

an aerial photograph. Photo interpreters 

in the USGS-NPS Vegetation Mapping 

Program are knowledgeable about the 

vegetation in their project area and highly 

skilled in identifying vegetation map units 

accurately and consistently. 

Photo interpretation key: A description 

of the distinguishing features that make 

up the signature of each map class. This 

description may include written clues, as 

well as graphic examples of the signatures. 

Photosignature: Characteristics of an item 

on a photograph by which the item may be 

identified. 

Physiognomy: The structure and life form 

of a plant community (FGDC 1997). 

Plant community: A generic term that 

references any vegetation found in the 

mapping study and can be any level in 

the USNVC, association or alliance, or 

a unique community to the park, a park 

special. 

Positional accuracy: The nearness of 

a point in a spatial database to its actual 

location on the earth’s surface. The 

program standard for horizontal positional 

accuracy meets National Map Accuracy 

Standards at the 1:24,000 scale. This means 

that each well-defined object in the spatial 

database will be within 1/50 of an inch of 

its actual location or 40 feet (12.2 meters). 

Producer accuracy: The probability that 

a reference sample (the ground data) 

has been classified correctly, also known 

as error of omission. This quantity is 

computed by dividing the number of 

samples that have been classified correctly 

by the total number of reference samples 

in that class (Story and Congalton 1986). 

Compare with user accuracy. 

Projection: A map or a geospatial database 

is a flat representation of data located on a 

curved surface. A projection is a device for 

producing all or part of a round body on a 

flat sheet. This projection cannot be done 

without distortion, so the cartographer

Glossary 

must choose which characteristic 

(distance, direction, scale, area, or shape) 

that is to be emphasized at the expense of 

the other characteristics (Snyder, 1982). All 

spatial data in the program are represented 

in the Universal Transverse Mercator 

(UTM) coordinate system that is based on 

the transverse mercator projection applied 

between 84 degrees north and 80 degrees 

south latitude. 

Quadrangle: A USGS paper map. 

Typically, a 7.5-minute USGS map. 

Informally known as quad. 

Quarter quadrangle: A map or image 

that includes ¼ the area of a 7.5-minute 

quadrangle and is organized in quadrants 

of the original quadrangle as follows: 

Northeast, Northwest, Southeast, and 

Southwest. USGS DOQQs cover ¼ of a 

7.5-minute quadrangle. Informally known 

as quarter quad. 

Rectify: Remove distortions common 

to aerial photographs in the process 

of automating the photo-interpreted 

information into a digital database. 

Distortions on aerial photographs are due 

to topographic relief on the ground, radial 

distortion in the geometry of the aerial 

photography, tip and tilt of the plane, and 

differences in elevation of the airplane 

from its nominal scale. This process may 

be separate or included in the registration 

process depending on the technology 

used. See transfer. 

Register: The process of correlating 

objects on an aerial photograph with 

locations on the surface of the Earth 

using a defined coordinate system. This is 

necessary to be able to place the vegetation 

community data in a GIS with other 

appropriate data such as transportation, 

topography, soils, etc. This process may 

be separate or included in the rectification 

process depending on the technology 

used. See transfer. 

Scale: The relationship between a distance 

portrayed on a map and the same distance 

on the Earth (Dana 1999). A map scale 

can be defined by a representative fraction 

(e.g., 1 unit on map / 12,000 units on 

ground) or by a graphic scale bar. 

Spatial Data Transfer Standard (SDTS): 

A comprehensive transfer standard for 

Earth-referenced data endorsed by the 

Federal Geographic Data Committee. 

Spatial data in SDTS format consists of a 

group of files each with specific content 

and format. 

Signature: The unique combination 

of color, texture, pattern, height, 

physiognomy, and position in the 

landscape used by an photo interpreters 

to identify map classes on an aerial 

photograph. 

Stratum: A horizontal layer of vegetation. 

A stratum may be defined by the life form 

of the vegetation (tree, shrub, herbaceous), 

or its actual height. 

Structure (Vegetation): The spatial 

distribution pattern of life forms in a plant 

community, especially with regard to their 

height, abundance, or coverage within 

the individual layers. Synonymous with 

physiognomy. 

Subclass: The level in the National 


hierarchy under class based on growth 

form characteristics (Grossman et al. 

1998). See hierarchy under USNVS. 

Subgroup: The level in the National 


hierarchy below group which divides each 

group into either a “natural/semi-natural” 

or “cultural” (planted/cultivated) subgroup 

(Grossman et al. 1998). See hierarchy 

under USNVS. 

Transfer: The process of moving photo 

interpreted data from an aerial photo 

overlay to an ortho image to register 

and rectify the data. This process varies 

depending on the type of technology used. 

Transform(ation): The process of 

converting coordinates (map or image) 

from one coordinate system to another. 

This involves scaling, rotation, translation, 

and warping (images) (ESRI 1994). 

67


Transition zone: An area where the 

vegetation composition and structure is 

intermediate between two associations. 

The transition zone may be small as the 

associations abruptly change due to a large 

shift in the landscape, such as a cliff, or it 

may be large as the physical environment 

changes gradually. Transition zones often 

are challenges to properly classify and/or 

map vegetation. 

United States National Map Accuracy 

Standards (NMAS): USGS accuracy 

standards for published maps, including 

horizontal and vertical accuracy, accuracy 

testing method, accuracy labeling on 

published maps, labeling when a map is 

an enlargement of another map, and basic 

information for map construction as to 

latitude and longitude boundaries. The 

table below shows the standard for some 

common map scales. To meet NMAS 

maps must have less than 10 percent of the 

points tested (well-defined points) exceed 

the standard. Note that the conversion of 

paper maps into digital data usually creates 

additional error. 

sample from the mapped data actually 

represents that category on the ground, 

also known as error of commission. This 

quantity is computed by dividing the 

number of correctly classified samples 

by the total number of samples that were 

classified as belonging to that category 

(Story and Congalton 1986). Compare with 


Universal Transverse Mercator 

(UTM): Map coordinate system (not a 

map projection) that is defined by the 

Transverse Mercator projection, which has 

a set of zones defined by a central meridian 

as shown in the figure below for the United 

States (Portions from ESRI 1994). All 

spatial data products developed by the 

program (vegetation spatial data, plot and 

accuracy assessment plot data locations 

are in this coordinate system. 

68 

Horizontal accuracy examples. 

Scale Engineering National Map 

Scale Accuracy 

Standard 

1:1,200 1”= 100’ +/- 3.33 feet 

1:2,400 1”= 200’ +/- 6.67 feet 

1:4,800 1”= 400’ +/- 13.33 feet 

1:9,600 1”= 800’ +/- 26.67 feet 

1:10,000 +/- 27.78 feet 

1:12,000 1” = 1000’ +/- 33.33 feet 

1:24,000 1” = 2000’ +/- 40.00 feet 

1:63,360 1” = one mile +/- 105.60 feet 

1:100,000 +/- 166.67 feet 

United States National Vegetation 

Classification (USNVC): The Association 

for Biodiversity’s vegetation classification 

system. It is the basis for the FGDC 


Standard. 

User accuracy: The probability that a 

Universal Transverse Mercator projections for 

the U.S. 

Vegetation: The collective plant cover over 

an area (FGDC 1997). 

Vegetation characterization: The detailed 

portrayal of a vegetation association 

using diagnostic and dominant species, 

structure, and ecological processes. 

The program has a formal structure for 

association description based on the 

ABI model. Also known as vegetation 

description. An example of an association 

characterization can be found at http:// 

biology.usgs.gov/npsveg/agfo/mapclass/ 

scbc.pdf. 

Vegetation classification: The process 

of categorizing vegetation into repeatable

Glossary 

and consistent elements. Also a document 

the lists and organizes the vegetation 

communities in an area. An example of a 

vegetation classification can be found at 

http://biology.usgs.gov/npsveg/agfo/report. 

pdf#classification. 

Vegetation community: See plant 

community. 

Vegetation description: See vegetation 

characterization. 

Vegetation field key: See dichotomous 

field key 

Vegetation key: See dichotomous field key 

Vegetation mapping: The process 

of identifying, labeling, and placing 

in real world coordinates vegetation 

communities. 

Vegetation structure: See structure 

(vegetation). 

Vertical aerial photography: See Aerial 

Photography. 

Wetland: A location on the landscape 

that is characterized by either hydric soils 

or hydrophytic plants or both. A wetland 

may be vegetated or non-vegetated. The 

vegetation description for each association 

includes it wetland status. 

Literature Cited 

Anderson, J. R., E. E. Hardy, and J. 

T. Roach 1976. Land use and land 

cover classification system for use with 

remote sensing data. Geological Survey 

Professional Paper 964. A revision of 

the land use classification system as 

presented in US Geological Circular 

671. Washington, D.C.: U.S. Government 

Printing Offce. 

Dana, P. H. 1999. Map projection 

overview. http://www.colorado.edu/ 

geography/gcraft/notes/mapproj/ 

mapproj_f.html. 

Daubenmire, R. F. 1978. Plant geography, 

with special reference to North America. 

New York: Academic Press. 

Environmental Systems Research Institute, 

Inc. (ESRI). 1994. Understanding GIS: The 

Arc/Info method. Redlands, California. 


(FGDC). 1997. Vegetation classification 

standard. http://www.fgdc.gov/standards/ 

projects/FGDC-standards-projects/ 

vegetation/vegclass.pdf. 

Gabriel, H. W., and S. S. Talbot. 1984. 

Glossary of landscape and vegetation 

ecology for Alaska. Alaska Technical 

Report 10. U.S. Bureau of Land 

Management, U.S. Department of the 

Interior, Washington, D.C. 

Grossman, D. H., D. Faber-Langendoen, 

A. S. Weakley, M. Anderson, P. Bourgeron, 

R. Crawford, K. Goodin, S. Landal, K. 

Metzler, K. Pattterson, M. Pyne, M. Reid, 

and L. Sneddon. 1998. International 

classification of ecological communities: 

terrestrial vegetation of the United States. 

Volume I. The Nature Conservancy: 

Arlington, Virginia. 

Grossman, D. H., K. L. Goodin, X. Li, D. 

Faber-Langendoen, and M. Anderson. 

Developing and documenting a National 

Vegetation Classification Standard. 

1994. Prepared for the USGS-NPS 

Vegetation Mapping Program by The 

Nature Conservancy, Arlington Va., and 

Environmental Science Research Institute, 

Redlands, California. 

Grossman, D. H., K. L. Goodin, X. Li, D. 

Faber-Langendoen, M. Anderson, and 

R. Vaughan, Establishing standards for 

field methods and mapping procedures. 

1994. Prepared for the USGS-NPS 

Vegetation Mapping Program by The 

Nature Conservancy, Arlington Va., and 

Environmental Science Research Institute, 

Redlands, California. 

Rabchevsky, G. A., ed. 1984. Multilingual 

dictionary of remote sensing and 

photogrammetry. American Society of 

Photogrammetry: Falls Church, Virginia. 

Snyder, J. P. 1982. Map projections used by 

the U.S. Geological Survey. 2nd Edition. 

69


Washington, D.C.: U.S. Government 

Printing Offce. 

Stadelmann, M., A. Curtis, R. Vaughan, 

and M. Goodchild. 1994. Producing 

rigorous and consistent accuracy 

assessment procedures. Prepared for the 


by The Nature Conservancy, Arlington 

Va., and Environmental Science Research 

Institute, Redlands, California. 

Story, M., and R. G. Congalton. 1986. 

Accuracy assessment: A user’s perspective. 

Photogrammetric Engineering and 

Remote Sensing 52(3):397–399. 

70

Appendix A 

List of Petrified Forest National Park vegetation mapping project products 

This appendix lists the products developed for the Petrified Forest National Park vegetation 

mapping project. The report and appendices are available in hard copy and on the project 

DVD. The vegetation map database, field data locations and plant data, graphics, images, 

and metadata are also available on the DVD. This appendix lists each product, its file name 

on the DVD, and the format in which the product is available. The DVD is available with the 

hard copy report and through the Southern Colorado Plateau Network. These products are 

also available on the USGS-NPS Vegetation Mapping Program product pages (http://biology. 

usgs.gov/npsveg/products/pefo.html). 

Product/File Names 

Report 

peforpt.pdf. 

pefoquantclass.doc 

pefoveg.pdf. 

pefoveg_large.pdf. 

pefoplotsclass.pdf 

pefoplotsaa.pdf 

pefoplotspi.pdf. 

Description 

Full.report 

Graphics.of.quantitative.classification 

Low.resolution.map.graphic 

High.resolution.map.graphic 

Aerial.photography. 

pefocirmosaic.exe 

metapefocirmosaic.txt 

pefodoqq.exe 

metapefophotosdoqq.txt 

Aerial.photo.mosaic 

Metadata.for.aerial.photo.mosaic.in.text.format 

All.Digital.Ortho.Quarter.Quads 

Metadata.for.DOQQs.in.text.format 

Field.data 

pefodata.mdb. 

metapefodata.txt. 

pefofieldphotos.exe 

pefoplotfieldform.pdf 

pefoaafieldform.pdf 

Map.graphics.of.classification,.accuracy.assessment,.and.photointerpretation.plots 

Access.database.that.includes.all.classification.and.accuracy.assessment.field.data 

Metadata.for.classification.and.accuracy.assessment.field.data. 

in.text.format 

Field.photos:.classification.and.accuracy.assessment 

Classification.plots.field.form 

Accuracy.assessment.plots.field.form. 

Classification.spatial.data 

pefoplot.exe 

metapefofield.txt 

Classification.plots.shapefile.and.metadata 

Metadata.for.classification.plots 

Thematic.AA.points.spatial.data 

pefoaa.exe. 

Accuracy.assessment.plots.shapefile.and.metadata 

A1


Appendix A continued 

Product/File Names 

metapefoaa.txt. 

Description 

Metadata.for.accuracy.assessment.shapefile.in.text.format 

Park.boundary.spatial.data 

pefobdy.exe. 

metapefobdy.txt. 

Park.boundary.shapefile.and.metadata 

Metadata.for.park.boundary.in.text.format 

Project.boundary.spatial.data. 

pefoprjbdy.exe 

metapefoprjbdy.txt 

Project.boundary.shapefile.and.metadata 

Metadata.for.project.boundary.in.text.format 

Vegetation.map.spatial.data 

pefo.exe. 

metapefospatial.txt. 

Vegetation.map.shapefile.and.metadata 

Metadata.for.vegetation.maps.in.text.format 

Photointerpretation.sites.spatial.data 

pefophotoplots.exe 

metapefophotoplots.txt 

Photointerpretation.observation.locations.shapefile.and.metadata 

Photointerpretation.sites.shapefile.metadata.in.text.format. 

A2

Appendix B 

Relevé numbers 

This appendix lists the relevé numbers of ground-based observations for each plant 

community in this project. Although the 1993 database is not available through this 

project, data for the 2003 classification relevés and 2006 accuracy assessment observations 

are available as an Access database and mapped as a GIS shapefile. Images of the 2004 

classification relevés and 2006 accuracy assessment observations are also available. The 2004 

classification relevé number refers to the field PlotCode, found in the table, tblPlotDetails, in 

pefodata.exe. It is cross-walked to the field PlotCode, which is used to reference the relevé 

in all other classification tables in the database. The 2006 accuracy-assessment observation 

numbers refers to the field, PlotAACode, found in all four accuracy assessment tables in 

pefodata.exe. The photointerpreter’s observation locations are also mapped as a shapefile. 

Locations on the DVD for these products, and their corresponding metadata, can be found 

in Appendix A. The number for the photointerpreter’s observation locations refers to the 

field, PlotCode, in the pefophotoplots shapefile. 

B1

B2 

Appendix B 

Plant Community 2003 1993 AA 

Woodland . . . 

1 Juniperus monosperma./.Artemisia 

bigelovii.Woodland 

2 Pinus edulis.-.(Juniperus osteosperma)./.Bouteloua 

gracilis.Woodland 

3 Populus fremontii./.Ericameria nauseosa.Woodland 

PE-110,.PE-145 . A1,.A11,.A1-A,.A2,.A2-A,.A3,.A4,.A8,.A9,.A5,.F10,.F9 

PE-114 . . 

PE-124,.PE-139. . A1-S,.A2-S,.I17-S 

Shrubland . . . 

6 Artemisia filifolia.Colorado.Plateau. 


8 Ericameria nauseosa.Desert.Wash. 


4 Allenrolfea occidentalis.Shrubland. PE-080 . B14,.B15,.B21,.B22,.B3,.BB3,.FF7,.FF8 

5 Artemisia filifolia./.Bouteloua eriopoda.Shrubland 

PE-010,.PE-035,.PE-036,. . . 

PE-128 

PE-026,.PE-056,.PE-060,.PE- 

092,.PE-093,.PE-120,.PE-143,. 

PE-146 

PE-002,.PE-012,.PE-013,. 

PE-047 

7 Atriplex canescens./.Pleuraphis jamesii.Shrubland 

PE-008,.PE-024,.PE-109,.PE- 

111,.PE-126,.PE-129,.PE-037,. 

PE-140. 

6008,.6033,.6049,.6061,.6083,. 

7301 

B12-S,.B13-S,.B15-S,.B1-S,.B3-S,.B5-S,.B8-S,.B9-S,.C10,. 

C11,.C19,.C22,.C24,.C25,.C5-S,.C6-S,.E1,.H12,.I1-S,.J1,. 

K4,.N14,.N16,.N18,.N30,.N5,.T2,.U1 

6053,.6055,.6063,.6074,.6076 A6,.B11,.B12,.B17,.B2-S,.B4-S,.B7,.B8,.B9,.C12,.C12-S,. 

C13-S,.C14,.C17-S,.C18-S,.C19-S,.C20,.C22-S,.C28,.C6,. 

C8,.C8-S,.C9-S,.F12,.F2-S,.F3-S,.F7,.G21-S,.G7-S,.H10,. 

I11-S,.J1-S,.J2-S,.L1-S,.L5-S,.L9-S,.N21,.N22,.N24,.N25,. 

N26,.N29,.N3,.N4,.N6,.O4-S,.R12-S,.R13-S,.R5-S,.R8-S,. 

V3 

6037,.6040,.6043,.6058,.6078,. 

7148,.7170;.6080,.6082,.7159 

B25,.BB2,.BB24,.C1-S,.C20-S,.C21-S,.C23-S,.C24-S,.C27- 

S,.C2-S,.C3-S,.C4-S,.C7-S,.F12-S,.G4,.J5-S,.W9-S 

9 Forestiera pubescens.Shrubland . 6011 . 

10 Gutierrezia sarothrae.-.(Opuntia. PE-038,.PE-107 6001,.6018,.6020,.6023,.6025,. . 

spp.)./.Pleuraphis jamesii.Dwarfshrubland 

6028,.6035,.6045,.6048,.6073,. 

7083,.7014,.7252. 

11 Isocoma drummondii.-.Pleuraphis PE-112 7054,.7175,.7154 BB4,.D1,.D3,.E4,.FF5,.K21,.X9-S,.K3 

jamesii.Shrubland 

12 Iva acerosa.-.Sporobolus airoides. 


PE-116 . G5,.G6 

13 Krascheninnikovia lanata./.Boutel- PE-086 . B31-S,.C2,.E2,.P5,.P6,.P7 

oua gracilis.Dwarf-shrub.Herbaceous. 


14 Krascheninnikovia lanata.Dwarf- PE-137 . C3 

shrubland. 


Appendix B.continued 

B3 


15 Purshia stansburiana.-.Eriogonum PE-123,.PE-133,.PE-138,.PE- . A13,.F11,.F2,.F3,.F4,.F5,.F6 

corymbosum.Shrubland 

141,.PE-144 

16 Rhus trilobata.-.Ephedra.(viridis,.tor- PE-105,.PE-134,.PE-148 . H6-S,.Y1,.Y4-S,.Y7-S,.Y8-S 

reyana).Talus.Shrubland. 

17 Salix exigua./.Barren.Shrubland PE-006,.PE-127 . D1-S 

18 Salvia pachyphylla.Dwarf-shrubland PE-108,.PE-115 . J2,.J3,.J4,.J5,.J6,.J7 

19 Sarcobatus vermiculatus./.Atriplex . . B24,.FF1,.FF10,.FF11,.FF14,.FF19,.FF20,.FF26,.FF28,. 

obovata.Shrubland 

FF3,.FF30,.FF6,.FF9,.G12,.L8-S 

20 Sarcobatus vermiculatus./.Suaeda PE-066 . BB1-S,.BB2-S,.E2-S,.P19-S,.P20-S 

moquinii.Shrubland 

21 Suaeda moquinii.Shrubland PE-106 . E1-S 

22 Tamarix.spp..Temporarily.Flooded. PE-005,.PE-125 7128 BB25,.BB26,.F6-S,.F9-S,.G14,.F10-S 

Semi-natural.Shrubland 

Herbaceous . . . 

23 Atriplex obovata./.Sporobolus PE-014,.PE-022,.PE-033,.PE- 6012,.6047,.6057,.6060,.6070,. B1,.B2,.B6,.C14-S,.C16-S,.C17,.E5,.FF15,.FF16,.FF17,. 

airoides.-.Pleuraphis jamesii.Shrub. 040,.PE-048,.PE-050,.PE-070,. 6072,.7007,.7009,.7017,.7021,. FF18,.FF21,.FF23,.G1-S,.G2-S,.G8-S,.HH1,.I16-S,.K1,. 

Herbaceous.Vegetation PE-081,.PE-094,.PE-117,.PE- 7023,.7076,.7111,.7115,.7138,. K11-S,.K15,.L1,.L11,.L15,.L17,.L26,.L30,.L5,.M3-S,.M4- 

131,.PE-149 7173,.7281 S,.N2-S,.N3-S,.N6-S,.N7-S,.N8-S,.P11-S,.P12-S,.P13-S,. 

P14-S,.P15-S,.P16-S,.P17-S,.P18-S,.R14-S,.R6,.S10-S,. 

T10-S,.T15-S,.T17-S,.T18-S,.T19-S,.T21-S,.T2-S,.U12-S,. 

U13-S,.U15-S,.U4-S,.W8,.X19,.X21,.X4-S,.Y2-S 

24 Bouteloua eriopoda.-.Pleuraphis 

jamesii.Herbaceous.Vegetation 

25 Bouteloua gracilis.-.Pleuraphis jamesii.Herbaceous.Vegetation 

27 Calamovilfa gigantea.Desert.Wash. 

Shrub.Herbaceous.Vegetation 

29 Opuntia.whipplei.-.Sporobolus airoides.Shrub.Herbaceous.Vegetation 

PE-023,.PE-041,.PE-042,. 

PE-087 

7124 K6-S 

PE-004,.PE-068,.PE-099 6013,.6016,.6017,.6052,.7307,. C15-S,.C27,.E13,.G3-S,.I6-S,.N10-S,.N11-S,.N4-S,.P1,.P2,. 

7029,.7032,.7090,.7096,.7098,. P4,.P4-S,.R1-S,.R6-S,.T4-S,.T9-S 

7119,.7123,.7314. 

26 Bouteloua gracilis.Herbaceous.Vegetation 

PE-046,.PE-057,.PE-058,.PE- 

059,.PE-061,.PE-071,.PE-088,. 

PE-096,.PE-136 

6002,.6007,.6010,.6021,.6024,. 

6027,.6029,.6030,.6032,.6034,. 

7024,.7028,.7030,.7062,.7089,. 

7100,.7102,.7113,.7243,.7261,. 

7280 

PE-104,.PE-121,.PE-135 . . 

PE-097 . . 

B7-S,.P3 

Appendix B: Relevé numbers

B4 

Appendix B .continued 


30 Pleuraphis jamesii.-.Sporobolus airoides.Herbaceous.Vegetation 

PE-015,.PE-043,.PE-085,. 

PE-103 

6003,.6019,.6038,.6039,.6041,. 

6044,.6045,.6054,.6068,.6079,. 

7004,.7008,.7015,.7033,.7037,. 

7050,.7053,.7058,.7091,.7099,. 

7101,.7105,.7108,.7116,.7120,. 

7130,.7145,.7153,.7155 

E10,.E15,.E16,.E17,.E21,.E22,.E24,.E28,.E6,.E7,.E9,. 

FF22,.K3-S,.L21,.O10-S,.O2,.O3,.O8-S,.P10,.P7-S,.P9,. 

Q1,.R11,.R12,.R13,.R14,.R16-S,.R17,.R18,.R19,.R20,. 

R28,.R3,.R30,.R34,.R35,.R36,.R37,.R8,.S1,.S3,.S5,.S6,. 

T9,.X22 

31 Salsola tragus.Sand.Dune.Vegetation PE-016,.PE-130. . T10,.K12,.K17,.K18,.K20,.K26,.K30,.N1,.N11,.N12,.R2- 

S,.R3-S,.R9-S 

32 Sporobolus airoides.-.Bouteloua 

gracilis.Herbaceous.Vegetation 

PE-018,.PE-019,.PE-020,.PE- 

025,.PE-034,.PE-073,.PE-150. 

6015,.7002,.7039,.7087,.7131,. 

7293. 

B4,.B6-S,.C11-S,.CC1-A,.E12,.E25,.E3,.E8,.G10-S,.I14-S,. 

I15-S,.I3-S,.I4-S,.I8-S,.K12-S,.K13-S,.K14-S,.K16-S,.K1- 

S,.K4-S,.K9,.L10-S,.L2-S,.O2-S,.O3-S,.P21-S,.P2-S,.P8,. 

P8-S,.Q2-S,.R11-S,.R7-S,.S10,.S2,.S4,.T11,.T16-S,.T4,. 

U14-S,.U5-S,.U6-S 

33 Sporobolus airoides.Southern.Plains. PE-053,.PE-076 6022,.6046,.7003,. C18,.D2,.E11,.E14,.E18,.E19,.E20,.E23,.E31,.E32,.E33,. 

Herbaceous.Vegetation. 

E34,.E35,.FF12,.FF27,.FF36,.FF4,.L20,.L4-S,.L7-S,.M1-S,. 

M2-S,.O1-S,.O4,.O5,.O5-S,.O6-S,.O7-S,.O9-S,.P10-S,. 

P1-S,.P9-S,.R18-S,.R9,.T1,.T3 

34 Sporobolus coromandelianus.Herba- PE-067 . . 

ceous.Vegetation 

35 Sporobolus cryptandrus.Great.Basin. PE-065 . . 

Herbaceous.Vegetation 

Sparse . . . 

36 Atriplex obovata.Badland.Sparse. PE-021,.PE-028,.PE-039,.PE- 6036,.6059,.6067,.6071,.6077,. AA6,.BB12,.K2-S,.L10,.L13,.L14,.L6,.N5-S,.R25,.T11-S,. 

Vegetation 051,.PE-064,.PE-069,.PE-075,. 7010,.7012,.7036,.7042,.7047,. T12-S,.T13-S,.T14-S,.T20-S,.T22-S,.T7-S,.T8-S,.U3-S,.U7- 

PE-082,.PE-089,.PE-095,. 7084,.7132,.7137,.7147,.7156. S,.U9-S,.V11-S,.V12-S,.V2-S,.W1,.W10,.W10-S,.W12,. 

PE-119 

W12-S,.W15,.W19,.X11,.X17,.X6-S 

37 Ephedra.torreyana.-.Artemisia big- PE-009,.PE-011,.PE-030,.PE- 6004,.6005,.6031,.6042,.6050,. C15,.F1,.F8,.G5-S,.G6-S,.H18,.H19,.H23,.H25,.H27,. 

elovii.Sparse.Vegetation 031,.PE-052,.PE-062,.PE-077,. 6051,.6056,.6062,.6064,.6065,. H28,.H3,.H4,.H5,.H6,.H8,.H9,.I2-S,.I5-S,.I7-S,.K16,.L16,. 

PE-083,.PE-090,.PE-122,.PE- 6075,.7178. M1,.N2,.N8,.Q1-S,.S11-S,.S12-S,.S1-S,.S3-S,.S6-S,.S8-S,. 

132,.PE-142 

Y11-S,.Y12-S,.Y15-S,.Y29-S,.Y3-S,.Y6-S 

38 Eriogonum leptophyllum.Sparse. PE-001,.PE-003,.PE-007,.PE- 7056,.7060,.7164,.7066 V4,.H1-S,.H2-S,.S2-S,.S5-S,.T5-S,.W4,.W6,.Y13-S,.Y9-S 


045,.PE-084,.PE-100 

39 Zuckia brandegeei.Sparse.Vegetation PE-017,.PE-027,.PE-029,.PE- 7038,.7044,.7057,.7059,.7065,. H11,.H7,.L19,.L3,.S4-S,.T6-S,.U1-S,.V9-S,.W17,.W7-S,. 

032,.PE-044,.PE-049,.PE-054,. 7078,.7082,.7086,.7125,.7162,. I1,.T1-S 

PE-055,.PE-063,.PE-078,.PE- 7294,.7313. 

079,.PE-091,.PE-098,.PE-101,. 

PE-113,.PE-118,.PE-147 


Appendix C 

Global and local plant community descriptions 

C.1 Introduction 

The plant community descriptions present information on each association, alliance, and 

park special as it occurs in Petrified Forest NP (local) and as it has been found elsewhere 

(global) (NatureServe 2007). The plant communities are organized by life form–woodland, 

shrubland, herbaceous, and finally sparse. 

Following is a summary of the information provided by each description, in the order in 

which it occurs within each description: 

1. Scientific name for plant community 

o. Translated name for plant community assigned by NatureServe 

o. NatureServe Code: Community Element Global code (CEGL) assigned by 

NatureServe 

2. Summary: Global concept of plant community 

3. Classification 

o. Classification Confidence: The level of confidence in the classification, based 

on the quality and type of data used in the analysis, as well as the extent to 

which the entire (or potential) range of the element was considered. Values 

include: 1 = Strong, 2 = Moderate, and 3 = Weak. 

o. Classification Comments: Globally and locally 

o. Vegetation Hierarchy 

- Physiognomic Class: NVCS version 1 class 

- Physiognomic Subclass: NVCS version 1 subclass 

- Physiognomic Group: NVSC version 1 group 

- Physiognomic Subgroup: NVCS version 1 subgroup 

- Formation Name: NVCS version 1 formation name 

- Alliance Name: NVCS version 1 alliance name 

4. Ecological Systems Placement: Nature Serve-assigned ecological system 

5. NatureServe Conservation Status: NatureServe-assigned conservation status rank 

(G5 Secure/G4 Apparently secure/G3 Vulnerable/G2 Imperiled/GNR Not yet 

ranked) 

6. Distribution: Global and local distribution 

7. Environmental Setting 

o. USFWS Wetland System (Cowardin et al. 1979) 

o. Global and local environments of occurrence 

8. Vegetation 

o. Global and local descriptions 

o. Most Abundant Species: Global and local 

o. Other Noteworthy Species: Global and local 

9. Element Sources 

o. Authors of global and local descriptions 

o. References 

C1


Appendix C. Global and local plant community descriptions 

C.2.1. Juniperus monosperma / Artemisia bigelovii.Woodland............................................... C4 

C.2.2...Pinus edulis - (Juniperus osteosperma) / Bouteloua gracilis.Woodland.........................C7 

C.2.3...Populus fremontii / Ericameria nauseosa.Woodland....................................................C10 

C.3.1...Allenrolfea occidentalis Shrubland................................................................................ C13 

C.3.2...Artemisia filifolia / Bouteloua eriopoda.Shrubland......................................................C16 

C.3.3...Artemisia filifolia.Colorado.Plateau.Shrubland.............................................................C19 

C.3.4...Atriplex canescens / Pleuraphis jamesii.Shrubland........................................................C22 

C.3.5...Ericameria nauseosa.Desert.Wash.Shrubland................................................................ C25 

C.3.6...Forestiera pubescens Shrubland..................................................................................... C28 

C.3.7...Gutierrezia sarothrae.-.(Opuntia.spp.)./.Pleuraphis jamesii Dwarf-shrubland.............C31 

C.3.8...Isocoma drummondii - Pleuraphis jamesii Shrubland.[Park.Special]............................C34 

C.3.9...Iva acerosa - Sporobolus airoides.Shrubland.[Park.Special]..........................................C36 

C.3.10...Krascheninnikovia lanata / Bouteloua gracilis.Dwarf-shrub.Herbaceous....... 

Vegetation............................................................................................................................... .. C38 

C.3.11...Krascheninnikovia lanata.Dwarf-shrubland................................................................ C41 

C.3.12...Purshia stansburiana - Eriogonum corymbosum.Shrubland.......................................C44 

C.3.13...Rhus trilobata - Ephedra (viridis, torreyana).Talus.Shrubland....................................C46 

C.3.14...Salix exigua./.Barren.Shrubland.................................................................................... C49 

C.3.15...Salvia pachyphylla.Dwarf-shrubland.[Park.Special].....................................................C52 

C.3.16...Sarcobatus vermiculatus / Atriplex obovata.Shrubland.[Park.Special].......................C54 

C.3.17...Sarcobatus vermiculatus / Suaeda moquinii.Shrubland..............................................C56 

C.3.18...Suaeda moquinii.Shrubland.......................................................................................... C58 

C.3.19...Tamarix.spp..Temporarily.Flooded.Semi-natural.Shrubland.......................................C60 

C.4.1...Atriplex obovata / Sporobolus airoides - Pleuraphis jamesii.Shrub.Herbaceous. 

Vegetation............................................................................................................................... .. C63 

C.4.2...Bouteloua eriopoda - Pleuraphis jamesii.Herbaceous.Vegetation...............................C66 

C.4.3.. Bouteloua gracilis - Pleuraphis jamesii.Herbaceous.Vegetation..................................C69 

C.4.4...Bouteloua gracilis.Herbaceous.Vegetation.................................................................... C72 

C.4.5...Calamovilfa gigantea.Desert.Wash.Shrub.Herbaceous.Vegetation.............................C75 

C.4.6...Ericameria nauseosa / Bouteloua gracilis.Shrub.Herbaceous.Vegetation....................C77 

C.4.7...Opuntia whipplei - Sporobolus airoides.Shrub.Herbaceous.Vegetation..................... 

[Park.Special].............................................................................................................................. C80 

C.4.8...Pleuraphis jamesii - Sporobolus airoides.Herbaceous.Vegetation...............................C82 

C2

Appendix C: Global and local plant community descriptions 

C.4.9...Salsola tragus Sand.Dune.Vegetation.[Park.Special].................................................... C85 

C.4.10...Sporobolus airoides - Bouteloua gracilis.Herbaceous.Vegetation............................ C87 

C.4.11...Sporobolus airoides.Southern.Plains.Herbaceous.Vegetation................................... C90 

C.4.12.. Sporobolus coromandelianus.Herbaceous.Vegetation.[Park.Special]....................... C93 

C.4.13...Sporobolus cryptandrus.Great.Basin.Herbaceous.Vegetation................................... C95 

C.5.1...Atriplex obovata.Badland.Sparse.Vegetation.............................................................. C98 

C.5.2...Ephedra torreyana -.Artemisia.bigelovii.Sparse.Vegetation..................................... C101 

C.5.3.. Eriogonum leptophyllum Sparse.Vegetation............................................................. C104 

C.5.4...Zuckia brandegeei.Sparse.Vegetation........................................................................ C106 

Literature.Cited........................................................................................................................ C109 

C3


C.2 Woodland 

C.2.1. Juniperus monosperma / Artemisia bigelovii Woodland 


NatureServe common name 

NatureServe code 

One-seed.Juniper./.Bigelow’s.Sagebrush.Shrubland 

One-seed.Juniper./.Bigelow’s.Sagebrush.Woodland 

CEGL000705 

Summary: 

This woodland association ranges from southern Colorado to northern New Mexico and Arizona, 

and possibly extreme southern Utah. Stands occur in the mesas and hillslopes, piedmonts, canyons, 

escarpments, and other geographic breaks in the southern Colorado Plateau to foothills of 

the southern Rocky Mountains and breaks in the southwestern Great Plains. Elevation ranges from 

1520-2130 m (5000-7000 ft). Sites are on nearly level surfaces to steep, rocky slopes in canyons and 

on hillsides. Stands occur on all aspects except in elevational extremes where low-elevation stands 

are restricted to the more mesic north slopes; whereas high-elevation stands occur on southern 

aspects. Sites are typically dry with shallow, rocky, calcareous, alkaline soils. Soil textures range 

from sandy loam to clay soils typically derived from limestone, sandstone, or shale. The vegetation 

is characterized by a typically open (5-15% cover) to occasionally moderately dense evergreen, 

scale-leaved tree canopy 2-7 m tall composed of Juniperus monosperma. Sparse canopy stands 

have trees distributed in patches, resembling a savanna; whereas, in the moderately dense stands, 

the tree crowns touch. Occasional Pinus edulis trees may also be present. At higher elevations, 

Juniperus scopulorum may be present, and in the southern extent, Madrean evergreen woodland 

elements such as Juniperus deppeana and Juniperus coahuilensis (= Juniperus erythrocarpa) may 

be present but not codominant. The understory is typically a sparse and patchy dwarf-shrub layer 

dominated by Artemisia bigelovii. Other shrubs and dwarf-shrubs may be present, such as Atriplex 

canescens, Ephedra spp., Gutierrezia sarothrae, Krascheninnikovia lanata, Opuntia spp., Parryella 

filifolia, Purshia stansburiana, Yucca spp., and Mahonia fremontii, depending on geography. A 

sparse to moderately dense herbaceous layer dominated by perennial grasses may be present. The 

most abundant species are Bouteloua eriopoda, Bouteloua gracilis, Aristida spp., Pleuraphis jamesii 

(= Hilaria jamesii), Achnatherum hymenoides (= Oryzopsis hymenoides), Piptatherum micranthum 

(= Oryzopsis micrantha), Sporobolus spp., Hesperostipa comata, Hesperostipa neomexicana, and 

introduced annual grass Bromus tectorum. Many forb species can occur, but few have much cover. 

Classification confidence: 2-Moderate 

Classification comments: 

Globally. Stuever and Hayden (1997a) suggest that this association may occur in southern 

Utah; however, Welsh et al. (1993) states that all identifications of Juniperus monosperma in 

Utah are tentative. 

Petrified Forest National Park. The sparse total vegetation cover of these two relevés and 

the existence of a tree layer makes it diffcult to classify this association as a woodland community. 

However, the dominant species in both relevés was Juniperus monosperma, which 

had a distinct structural component not present in the adjacent vegetation communities. 

C5


Vegetation hierarchy: 

Physiognomic class I Woodland 

Physiognomic subclass I.A Evergreen.woodland 

Physiognomic group I.A.8 Temperate.or.subpolar.needle-leaved.evergreen.woodland 

Physiognomic subgroup I.A.8.N Natural/Semi-natural.temperate.or.subpolar.needle-leaved. 

evergreen.woodland 

Formation name I.A.8.N.c Rounded-crowned.temperate.or.subpolar.needle-leaved. 


Alliance name 

Juniperus monosperma Woodland.Alliance.(A.504),.Oneseed.Juniper.Woodland.Alliance 

Ecological systems placement: 

Ecological system unique ID 

CES304.767 

Ecological system name 

Colorado.Plateau.Pinyon-Juniper.Woodland 

NatureServe conservation status: 

Global rank. G5 (23-Feb-1994). 

Distribution: 

Globally. This juniper woodland association occurs in the southern Colorado Plateau, 

foothills of the southern Rocky Mountains, and it extends out on limestone and sandstone 

breaks in the southwestern Great Plains ranging from northeastern Arizona and northern New 

Mexico into southeastern Colorado and possibly extreme southern Utah. 

Petrified Forest National Park. Juniperus monosperma - Artemisia bigelovii Woodland was 

identified from two relevés on terrace landforms at Petrified Forest National Park. This 

association was sampled on top of Chinde Mesa and west of Dry Wash and southwest of 

Crystal Forest. 

Environmental summary: 

Globally. Stands occur in the mesas and hillslopes, piedmonts, canyons, escarpments, and 

other geographic breaks in the southern Colorado Plateau to the foothills of the southern 

Rocky Mountains and breaks in the southwestern Great Plains. Elevation ranges from 1520- 

2130 m (5000-7000 ft). Sites are on nearly level surfaces to steep, rocky slopes in canyons and 

on hillsides. Stands occur on all aspects except in elevational extremes where low-elevation 

stands are restricted to the more mesic north slopes; whereas high-elevation stands occur on 

southern aspects. Sites are typically dry with shallow, rocky, calcareous, alkaline soils. Soil textures 

range from sandy loam to clay soils typically derived from limestone, sandstone, or shale. 

Petrified Forest National Park. This association was sampled at 1732 and 1838 m (5680-6030 

ft) elevation. Slope is none to minimal (0-3%). Sandstone surface rocks were identified at one 

of the relevés. 

USFWS wetland system: Not applicable. 

Vegetation description: 

Globally. The vegetation is characterized by a typically open (5-15% cover) to occasionally 

moderately dense evergreen, scale-leaved tree canopy 2-7 m tall composed of Juniperus 

monosperma. Sparse canopy stands have trees distributed in patches, resembling a savanna; 

whereas, in the moderately dense stands, the tree crowns touch. Occasional Pinus edulis 

trees may also be present. At higher elevations, Juniperus scopulorum may be present, and 

in the southern extent, Madrean evergreen woodland elements such as Juniperus deppeana 

and Juniperus coahuilensis (= Juniperus erythrocarpa) may be present but not codominant. 

C6


The understory is typically a sparse and patchy dwarf-shrub layer dominated by Artemisia 

bigelovii. Other shrubs and dwarf-shrubs may be present, such as Atriplex canescens, Ephedra 

spp., Gutierrezia sarothrae, Krascheninnikovia lanata, Opuntia spp., Parryella filifolia, 

Purshia stansburiana, Yucca spp., and Mahonia fremontii, depending on geography. A sparse 

to moderately dense herbaceous layer dominated by perennial grasses may be present. The 

most abundant species are Bouteloua eriopoda, Bouteloua gracilis, Aristida spp., Dasyochloa 

pulchella, Pleuraphis jamesii (= Hilaria jamesii), Achnatherum hymenoides (= Oryzopsis hymenoides), 

Piptatherum micranthum (= Oryzopsis micrantha), Sporobolus spp., Hesperostipa 

comata, Hesperostipa neomexicana, and introduced annual grass Bromus tectorum. Many 

forb species can occur, but few have much cover. Common forbs include Chaetopappa 

ericoides, Chamaesyce fendleri, Cryptantha sp., Chaetopappa ericoides, Eriogonum corymbosum, 

Eriogonum jamesii, Lesquerella fendleri, and Zinnia grandiflora. 

Petrified Forest National Park. Two relevés were classified as Juniperus monosperma - Artemisia 

bigelovii Woodland with a total vegetation cover of 15 and 18%. The vegetation cover 

consisted of a tree stratum with 4 and 5% cover, a shrub stratum with 10 and 12% cover, 

and an herbaceous stratum with 0.5 and 2% cover. The species diversity for the relevés was 

22 and 24 species. The vegetation was dominated by Juniperus monosperma in the tree layer 

with 4 and 5% cover. Artemisia bigelovii has significant cover in the shrub layer with each 

relevé having 2% cover. 

Most abundant species: 

Stratum Global species PEFO species 

Tree.canopy Juniperus monosperma Juniperus monosperma 

Tall/short.shrub/ Artemisia bigelovii, Gutierrezia Artemisia bigelovii 

sapling 

sarothrae 

Herb.(field) Achnatherum hymenoides, Aristida N/A 

purpurea, Bouteloua eriopoda, 

Bouteloua gracilis, Bromus tectorum, 

Hesperostipa comata, Hesperostipa 

neomexicana 

Other noteworthy species: 

Global species 

Data are not available. 

PEFO species 


References: 

Bourgeron and Engelking 1994; Dick-Peddie 1993; Driscoll et al. 1984; Larson and Moir 1987; Shaw 

et al. 1989; Stuever and Hayden 1997a; Welsh et al. 1993; Western Ecology Working Group n.d. 

C7



C.2.2. Pinus edulis - (Juniperus osteosperma) / Bouteloua gracilis Woodland 




Pinus edulis.-.(Juniperus osteosperma)./.Bouteloua gracilis. 

Woodland.was.only.located.at.one.small.area..This.association. 

was.mapped.with.the.One-seed.Juniper./.Bigelow’s.Sagebrush. 

Shrubland.base.map.class. 

Two-needle.Pinyon.-.(Utah.Juniper)./.Blue.Grama.Woodland 

CEGL000778 

Summary: 

This woodland association is known from mountains and mesas in the southern Colorado Plateau, 

from the Mogollon Rim, extending north into southern Utah and probably western Colorado. 

Elevations normally range from 1700-2400 m (5575-7875 ft). Sites are variable but generally are 

relatively dry and rocky. Stands occur on flat to moderate slopes along drainages and on mesatops, 

on gentle to moderate (10-40%) rocky slopes of foothills, and at the bases of cinder cones. The 

substrates are variable and range from deep, coarse-textured soils derived from cinder to finertextured 

soils derived from sandstone, shale and limestone. The vegetation is characterized by an 

open to moderately dense tree canopy (10-65% cover) codominated by Pinus edulis and Juniperus 

osteosperma trees that are between 1 and 5 m tall. Pinus edulis may be present with relatively 

small cover in some stands. Juniperus deppeana may replace Juniperus osteosperma in southern 

stands. Other species of Juniperus, such as Juniperus scopulorum, may be present in higher elevation 

stands. Shrub cover is sparse (


Petrified Forest National Park. The one relevé classified as Pinus edulis - (Juniperus osteosperma) 

/ Bouteloua gracilis Woodland may need to be reassessed with additional data 

collected at Petrified Forest National Park and the Navajo Nation. This relevé was separated 

from Juniperus monosperma / Artemisia bigelovii Woodland (CEGL000705) based on codominance 

of Pinus edulis in the tree layer. However, the Juniperus monosperma / Artemisia 

bigelovii Woodland association does have similar characteristics to the relevé described 

here: it lacks cover of Bouteloua gracilis in the herbaceous layer and has a dominance of 

Artemisia bigelovii in the shrub layer. 



Physiognomic subclass I.A Evergreen.woodland 

Physiognomic group I.A.4 Temperate.or.subpolar.needle-leaved.evergreen.woodland 

Physiognomic subgroup I.A.8.N Natural/Semi-natural.temperate.or.subpolar.needle-leaved. 


Formation name I.A.4.N.a Natural/Semi-natural.temperate.or.subpolar.needle-leaved. 


Alliance name 

Pinus edulis - (Juniperus spp.) Woodland.Alliance.(A.516),. 

Two-needle.Pinyon.-.(Juniper.species).Woodland.Alliance 



CES304.767 


Colorado.Plateau.Pinyon-Juniper.Woodland 



Distribution: 

Globally. This woodland association is known from mountains and mesas in the southern 

Colorado Plateau and Mogollon Rim of northern Arizona and extends into southern Utah 

and probably into western Colorado and possibly into western New Mexico. 

Petrified Forest National Park. Pinus edulis - (Juniperus osteosperma) / Bouteloua gracilis 

Woodland occurred on one relevé. It was located on a terrace north of Petrified National Forest 

on the Navajo Nation. 


Globally. This woodland association is known from mountains and mesas in the southern 

Colorado Plateau, from the Mogollon Rim, extending north into southern Utah and 

probably western Colorado. Elevations normally range from 1700-2400 m (5575-7875 ft). 

Sites are variable but generally are relatively dry and rocky. Stands occur on flat to moderate 

slopes along drainages and on mesatops, on gentle to moderate (10-40%) rocky slopes 

of foothills, and at the bases of cinder cones. The substrates are variable and range from to 

deep, coarse-textured soils derived from cinder, to sandy loams derived from sandstone or 

fine-textured soils derived from limestone or shale. 

Petrified Forest National Park. This association occurs at an elevation of 1840 m (6030 ft) 

with a moderate slope of 7%. The relevé has mudstone surface rocks. 


C9



Globally. This plant association is characterized by an open to moderately dense tree 

canopy (10-65% cover) codominated by Pinus edulis and Juniperus osteosperma trees that 

are between 1 and 5 m tall. Pinus edulis may be present with relatively small cover in some 

stands. Juniperus deppeana may replace Juniperus osteosperma in southern stands. Other 

species of Juniperus, such as Juniperus scopulorum, may be present in higher elevation 

stands. Shrub cover is sparse (



C.2.3. Populus fremontii / Ericameria nauseosa Woodland 


NatureServe Common Name 

NatureServe Code 

Cottonwood./.Rubber.Rabbitbrush.Woodland 

Fremont.Cottonwood./.Rubber.Rabbitbrush.Woodland 

CEGL002465 

Summary: 

This common woodland association occurs on the high terraces of perennial streams and on the 

banks of intermittent washes throughout the Colorado Plateau on sites that are rarely subject to flooding. 

Sites are level to gently sloping and are located between 1165 and 2165 m (3825-7100 ft) elevation. 

Soils are poorly developed, well-drained sands and loamy sands derived from alluvium. Total 

vegetation cover ranges from 34 to 170%. The 10- to 15-m tall canopy is dominated by mature Populus 

fremontii trees that range in cover from 5 to 50%. Other trees, both riparian and upland, may be 

present with low cover in the canopy and subcanopy, including Populus angustifolia, Salix gooddingii, 

and Juniperus osteosperma. Young Populus and Salix are rare, because these stands are often at least 

2 m above the water table. The shrub layer is low to moderate in terms of species composition and 

cover. Ericameria nauseosa dominates or codominates the stratum, often with Artemisia tridentata 

ssp. tridentata. Other shrubs may be scattered through the stand, including Rhus trilobata, Sarcobatus 

vermiculatus, Opuntia spp., Forestiera pubescens, Atriplex canescens, and Fraxinus anomala. The exotic 

Tamarix chinensis may also be present. The herbaceous layer is diverse in terms of species composition, 

although many species are exotic and most reflect upland conditions. Common graminoids 

include Achnatherum hymenoides, Agrostis stolonifera, Bromus tectorum, Bromus japonicus, Elymus 

canadensis, Sporobolus spp., and Juncus balticus. Forbs commonly present include Ambrosia acanthicarpa, 

Artemisia campestris, Castilleja linariifolia, Equisetum hyemale, Lepidium montanum, Sphaeralcea 

spp., and Heterotheca villosa. 



Globally. Data are not available. 

Petrified Forest National Park. This plant community was restricted to a few small areas in 

the park and the park environs. In the riparian corridor, scattered cottonwood trees did occur, 

but these patches were not large enough and did not contain a high enough abundance of 

cottonwoods to be mapped as this association. The few cottonwoods remaining in the riparian 

corridor appearred to mostly be larger, older trees with little regeneration of seedlings. 



Physiognomic subclass I.B Deciduous.woodland 

Physiognomic group I.B.2 Cold-deciduous.woodland 

Physiognomic subgroup I.B.2.N Natural/Semi-natural.cold-deciduous.woodland 

Formation name I.B.2.N.b Temporarily.flooded.cold-deciduous.woodland 

Alliance name 

Populus fremontii.Temporarily.Flooded.Woodland.Alliance. 

(A.644),.Fremont.Cottonwood.Temporarily.Flooded. 

Woodland.Alliance 



CES306.821 


Rocky.Mountain.Lower.Montane-Foothill.Riparian.Woodland. 

and.Shrubland 

C11



Distribution: 

Global rank. GNR (24-Mar-2005). 

Globally. This association has been described from southeastern Utah. It is likely to be widespread 

throughout the Colorado Plateau. 

Petrified Forest National Park. Populus fremontii / Ericameria nauseosa Woodland was identified 

on two relevés in Petrified Forest National Park. This association occurred on a bajada, 

a drainage channel, a playa, and a talus slope. Relevés were sampled about 0.5 km west of the 

park road and north of the Puerco River, as well as in the northwestern corner of the park 

along the banks of Digger Wash. 


Globally. This common woodland association occurs on the high terraces of perennial 

streams and on the banks of intermittent washes throughout the Colorado Plateau. These 

habitats are rarely subject to flooding. Sites are level to gently sloping and are located between 

1165 and 2165 m (3825-7100 ft) elevation. Aspect is not important in determining the distribution 

of this association. Bare soil and litter cover most of the unvegetated surface. Soils are 

poorly developed, well-drained sands and loamy sands derived from alluvium. 

Petrified Forest National Park. This association occurred at elevations of 1630 and 1720 m 

(5340-5640 ft). The slope was low (1-4%). Substrates found within this association included 

various types of gravel. This association was restricted to wetland areas with intermittent or 

seasonal flooding. 

USFWS wetland system: Palustrine. 


Globally. This woodland association is common throughout the Colorado Plateau, where it 

occupies dry terraces along intermittent and perennial stream courses. Total vegetation cover 

ranges from 27 to 170%. The 10- to 15-m tall canopy is dominated by mature Populus fremontii 

trees that range in cover from 5 to 50%. Other trees, both riparian and upland, may be present 

with low cover in the canopy and subcanopy, including Populus angustifolia, Salix gooddingii, 

and Juniperus osteosperma. Young Populus and Salix are rare, because these stands are 

often at least 2 m above the water table. The shrub layer is low to moderate in terms of species 

composition and cover. Ericameria nauseosa dominates or codominates the stratum, often 

with Artemisia tridentata ssp. tridentata. Other shrubs may be scattered through the stand, 

including Rhus trilobata, Sarcobatus vermiculatus, Opuntia spp., Forestiera pubescens, Atriplex 

canescens, Fraxinus anomala, and in the southern extent Parryella filifolia and Isocoma drummondii. 

The exotic Tamarix chinensis may also be present. The herbaceous layer is diverse in 

terms of species composition, although many species are exotic, and most reflect upland conditions. 

Common graminoids include Achnatherum hymenoides, Agrostis stolonifera, Bromus 

tectorum, Bromus japonicus, Elymus canadensis, Sporobolus airoides, and Juncus balticus. Forbs 

commonly present include Ambrosia acanthicarpa, Artemisia campestris, Castilleja linariifolia, 

Equisetum hyemale, Lepidium montanum, Sphaeralcea spp., and Heterotheca villosa. 

Petrified Forest National Park. Two relevés were classified as Populus fremontii / Ericameria 

nauseosa Woodland with total vegetation cover of 27 and 61%. The vegetation cover consisted 

of a tree stratum with 10 and 50% cover, a shrub stratum with 3 and 10% cover, and an herbaceous 

stratum with 7 and 8% cover. The species diversity for this association was 13 and 34 

species. The vegetation was dominated by Populus fremontii in the tree layer with 10 and 50% 

cover. Ericameria nauseosa dominated the shrub layer with 0.5 and 2% cover. One relevé had 

a high cover of the non-native grass Bromus tectorum with 3% cover. 

C12




Tree.canopy Populus fremontii Populus fremontii 

Tall/short.shrub/ Atriplex canescens, Ericameria Ericameria nauseosa 

sapling 

nauseosa, Artemisia tridentata ssp. 

tridentata 

Herb.(field) Artemisia campestris, Achnatherum N/A 

hymenoides 



Bromus tectorum, Tamarix chinensis 

PEFO species 


References: 

Western Ecology Working Group n.d. 

C13


C.3 Shrubland 

C.3.1. Allenrolfea occidentalis Shrubland 




Iodine.Bush.Shrubland 

Iodinebush.Shrubland 

CEGL000988 

Summary: 

This is a sparsely vegetated shrubland found on seasonally wet, alkaline playas, intermittent floodplains, 

or along washes in saline overflow areas below 1680 m (5500 ft) elevation. The dominant 

species, and playa communities in general, are widely distributed throughout the Intermountain West, 

ranging from southeastern Oregon south to Texas. These shrublands or barrens are flat to extremely 

low-gradient, almost always in desert ecosystems with less than 18 cm (7 inches) of rain per year, and 

usually in areas with very poor drainage that flood during rare rainstorms. Playas and washes dominated 

by Allenrolfea occidentalis generally appear to be small, rare, and poorly understood throughout 

their range. Allenrolfea occidentalis dominates the shrub layer, but cover is often quite low, ranging 

from 20% to less than 1%. Most stands have barren playa forb understories, but grasses, including 

Leymus cinereus, Distichlis spicata (= ssp. stricta), Sporobolus airoides, and Sporobolus wrightii, and 

succulent forbs, such as Suaeda suffrutescens var. detonsa, Salicornia spp., and Nitrophila spp., are 

occasionally found. Most stands occur in a matrix of Sarcobatus vermiculatus- or Atriplex canescensdominated 

shrublands, and in small stands, either Sarcobatus vermiculatus or Atriplex canescens can 

occur throughout the community. 



Globally. This appears to be a distinct, widespread type. With additional studies throughout 

the range of this habitat, it is possible that the type may be split into a number of geographic 

communities based on associated forbs. However, current data indicate the type is very similar 

throughout at least the northern half of its range, where it occurs in a matrix composed largely 

of Sarcobatus vermiculatus salt desert scrub. In the southern part of its range, where it is 

slightly more common, it occurs in a matrix of Larrea tridentata or Ambrosia dumosa. This is a 

broadly defined type that may need to be subdivided by characteristics of the understory. Muldavin 

et al. (2000b) classified five different plant associations in the Tulerosa Basin in southern 

New Mexico. 

Petrified Forest National Park. This association had higher herbaceous cover than shrub 

cover. However, since only one relevé of this vegetation community was sampled, and the 

existing Allenrolfea occidentalis Shrubland already occurred in the NatureServe database, the 

relevé was retained under this association classification. If additional data are collected and 

the continual high herbaceous cover is sampled, than this association may need to be reclassified 

as a shrub herbaceous vegetation community. 


Physiognomic class III. Shrubland 

Physiognomic subclass III.A Evergreen.shrubland 

Physiognomic group III.A.5 Extremely.xeromorphic.evergreen.shrubland. 

Physiognomic subgroup III.A.5.N Natural/Semi-natural.extremely.xeromorphic.evergreen. 


Formation name III.A.5.N.b Facultatively.deciduous.extremely.xeromorphic.subdesert. 


Alliance name 

Allenrolfea occidentalis Shrubland.Alliance.(A.866),. 

Iodinebush.Shrubland.Alliance 

C14




CES304.781 

CES304.786 


Inter-Mountain.Basins.Wash 

Inter-Mountain.Basins.Playa 


Global rank. G3 (23-Oct-2002). This is a very widespread, but limited and somewhat rare, 

alkaline playa vegetation type. It is not well studied, and it is poorly protected, but generally 

most stands are not very threatened. Where water is available from adjacent mountains, these 

areas are often converted to agriculture. However, their limited threats require a G3 rank. If 

many additional sites are discovered in Nevada, it could become a G4, and if the types associated 

with Sarcobatus turn out to be distinct from those with Atriplex canescens, it could be 

ranked higher. Protection of some sites in Nevada is important to assure that it remains secure 

throughout its range. 

Distribution: 

Globally. This playa community is widely distributed throughout the Intermountain West, 

ranging from southeastern Oregon south to Texas. 

Petrified Forest National Park. Allenrolfea occidentalis Shrubland was identified from one 

relevé on the upper slope of a bajada in the northern wilderness, west of Black Forest, and 

also on an observation point on a saline overflow area along an intermittent wash flowing into 

Lithodendron Wash. Substrates were marine shales such as Chinle. 


Globally. This shrubland association occurs across arid and semi-arid portions of the western 

U.S. at elevations ranging from near sea level to 1680 m. Stands occur on the outer margins of 

broad intermittent floodplains and playas, or can form landscape mosaics with other saline 

communities in saline marshes or gypsum-influenced habitats. Bare soil covers most of the 

unvegetated surface, and there is very little litter. Soils are fine-textured and derived from alluvium. 

Petrified Forest National Park. This association occurred at 1680 m (5500 ft) elevation. The 

slope was minimal (1%). 



Globally. Allenrolfea occidentalis dominates the shrub layer, but the cover is often quite low, 

ranging from 20% to less than 1%. Most stands have barren playa forb understories, but 

grasses, including Leymus cinereus, Distichlis spicata (= ssp. stricta), Sporobolus airoides, and 

Sporobolus wrightii, and succulent forbs, such as Suaeda suffrutescens var. detonsa, Salicornia 

spp., and Nitrophila spp., are occasionally found. Most stands occur either in a shrubland 

matrix dominated by Sarcobatus vermiculatus or Atriplex canescens, or in small stands; either 

Sarcobatus vermiculatus or Atriplex canescens can occur throughout these small stand communities. 

In the southern extent of its range, scattered Isocoma drummondii, Iva acerosa, or 

Prosopis glandulosa may be present. Exotic species, such as occasional Tamarix spp., Bromus 

tectorum, or Salsola tragus, may occur in this community. 

C15


Petrified Forest National Park. Only one relevé was classified as Allenrolfea occidentalis 

Shrubland, with total vegetation cover of 19%. The vegetation cover consisted of a shrub 

stratum with 14% cover and an herbaceous stratum with 5% cover. This relevé had a species 

diversity of 16 species. The vegetation in the shrub layer was dominated by Allenrolfea occidentalis, 

with 6% cover, and the herbaceous layer was dominated by Sporobolus airoides, with 5% 

cover. 



Short.shrub/ Allenrolfea occidentalis Allenrolfea occidentalis 

sapling 

Herb.(field) N/A Sporobolus airoides 




PEFO species 


References: 

Bourgeron and Engelking 1994, Driscoll et al. 1984, Griffths 1902, Kagan et al. 2000, Muldavin et al. 

2000b, NVNHP 2003, ORNHP unpubl. data, Western Ecology Working Group n.d. 

C16



C.3.2. Artemisia filifolia / Bouteloua eriopoda Shrubland 




This.association.was.not.mapped.as.a.separate.unit..The. 

photointerpreters.were.not.able.to.distinguish.the.understory. 

grasses,.and.these.representive.relevés.were.combined.into. 

Sandsage.Colorado.Plateau.Shrubland.and.Torrey’s.Jointfir.–. 

Bigelow’s.Sagebrush.Shrubland.map.classes. 

Sandsagebrush./.Black.Grama.Shrubland 

CEGL001077 

Summary: 

This sand sagebrush shrubland association occurs in the northern Jornada del Muerto and Tulerosa 

basins in south-central New Mexico and at Petrified Forest National Park in the southern Colorado 

Plateau at 1416-1748 m (4646-5735 ft) elevation. Stands frequently occur on flat to rolling sandsheets 

or sandy plains, mesatops, lower hillslopes and dunes. Slopes range from 0-27%. Soils are often sandy, 

but range from fine sandy loams to silty-clay loams with an abrupt clay or caliche layer within 100 

cm of the surface. The vegetation is characterized by an open to moderately dense (10-30 % cover) 

short-shrub layer (



Physiognomic class III Shrubland 

Physiognomic subclass III.A. Evergreen.shrubland 

Physiognomic group III.A.4. Microphyllous.evergreen.shrubland 

Physiognomic subgroup III.A.4.N. Natural/Semi-natural.microphyllous.evergreen.shrubland 

Formation name III.A.4.N.a. Lowland.microphyllous.evergreen.shrubland 

Alliance name 

Artemisia filifolia.Shrubland.Alliance.(A.816),. 

Sandsagebrush.Shrubland.Alliance 



CES304.793 

CES304.775 


Southern.Colorado.Plateau.Sand.Shrubland 

Inter-Mountain.Basins.Active.and.Stabilized.Dune 


Global rank. G4 (17-Jul-2000). 

Distribution: 

Globally. This association is described from the south-central New Mexico and northeastern 

Arizona. 

Petrified Forest National Park. Artemisia filifolia / Bouteloua eriopoda Shrubland was 

sampled from four relevés located mostly on low slopes and sideslopes and on sand dunes and 

sandsheets within Petrified Forest National Park. These relevés were all located in the central 

neck area of Petrified Forest National Park—specifically, west of the park road, south of Interstate 

40 and south of the northern headquarters, and southeast of the northern headquarters 

and west of the NPS boundary. 


Globally. This sand sagebrush shrubland association occurs in the northern Jornada and Tulerosa 

basins in south-central New Mexico and at Petrified Forest National Park in the southern 

Colorado Plateau at 1416-1748 m (4646-5735 ft) elevation. Stands frequently occur on flat 

to rolling sandsheets or sandy plains, mesatops, lower hillslopes, and dunes. Northern Chihuahuan 

Desert stands are often found near the periphery of sandsheets or on deflated plains 

where sand deposits are thinner and soils more developed (Muldavin et al. 2000b). Slopes 

range from 2-11% in New Mexico and 0-27% in Arizona. Soils are often sandy, but range from 

fine sandy loams to silty-clay loams with an abrupt clay or caliche layer within 100 cm of the 

surface (Muldavin et al. 2000b). 

Petrified Forest National Park. This association occurred between the elevations of 1709 

and 1743 m (5615-5720 ft). Slopes ranged from none to moderate (0-27%, average 11%). 



Globally. The vegetation is characterized by an open to moderately dense short-shrub layer 

(


Achnatherum hymenoides, Chamaesyce fendleri, Cryptantha crassisepala, Ephedra torreyana, 

Eriogonum leptocladon, Ipomopsis longiflora, Machaeranthera canescens, Phacelia crenulata, 

Plantago patagonica, Senecio spartioides, Stephanomeria exigua, and Yucca angustissima. The 

introduced annual grass Bromus tectorum is common in some stands. 

Petrified Forest National Park. Four relevés were classified as Artemisia filifolia / Bouteloua 

eriopoda Shrubland, with total vegetation cover ranging from 28-37% (average 34%). The vegetation 

cover consisted of a shrub stratum with 9-18% cover (average 13%) and an herbaceous 

stratum with 16-28% cover (average 22%). The species diversity ranged from 26 and 45 species 

(average 34 species). The shrub layer was dominated by Artemisia filifolia and ranged from 

2 and 6% cover (average 4%). The herbaceous layer was dominated by Bouteloua eriopoda, 

ranging between 0.5 and 5% cover (average 4%) and Bouteloua gracilis, ranging between 2 and 

5% cover (average 4%). 



Short.shrub/ Artemisia filifolia Artemisia filifolia 

sapling 

Herb.(field) Bouteloua eriopoda, Bouteloua Bouteloua eriopoda, Bouteloua 

gracilis 

gracilis 



Bromus tectorum 

PEFO species 


References: 

Bourgeron and Engelking 1994, Dick-Peddie 1993, Driscoll et al. 1984, Muldavin and Mehlhop 1992, 

Muldavin et al. 2000b, Sims et al. 1976, Western Ecology Working Group n.d. 

C19



C.3.3. Artemisia filifolia Colorado Plateau Shrubland 




Sandsage.Colorado.Plateau.Shrubland 

Sand.Sagebrush.Colorado.Plateau.Shrubland 

CEGL002697 

Summary: 

This sand sagebrush shrubland association is widespread in the Colorado Plateau of Utah, Arizona, 

and probably New Mexico. It occurs on sandy, often somewhat disturbed sites on valley floors, stream 

terraces, stabilized dunes and sandsheets, benches, floodplains, and alluvial fans. Most sites are level 

to gently sloping, with a few on moderate slopes (up to 21%), and may be oriented to any aspect, 

although there is a slight tendency toward warmer southerly aspects. Elevations range from 1122 to 

1769 m (3680-5803 ft). Sand or bare soil cover most of the unvegetated ground surface, although 

biological soil crusts may have up to 40% cover. Soils are sandy and derived from local sandstones, 

alluvium, or eolian deposits. Total vegetation cover ranges broadly, from sparsely vegetated disturbed 

sites with less than 5% total cover to stable, well-developed communities with more than 50% cover. 

Regardless of cover, the vegetation is characterized by an open shrub canopy dominated by Artemisia 

filifolia that is usually mixed with other shrubs, especially Atriplex canescens, Ericameria nauseosa, and 

Opuntia spp. Less commonly, the shrub layer will include Vanclevea stylosa, Eriogonum leptocladon, 

or Sarcobatus vermiculatus. Coleogyne ramosissima, Ephedra viridis, and Ephedra torreyana are generally 

absent or have only trace cover. The herbaceous layer is moderate in terms of species composition 

and provides sparse to moderate cover. Graminoids that are consistently present include Achnatherum 

hymenoides and Bromus tectorum; some sites may also have Hesperostipa comata, Pleuraphis 

jamesii, Sporobolus cryptandrus, and Vulpia octoflora. Forbs vary among sites but are typical of sandy 

habitats, including Abronia fragrans, Lepidium montanum, Oenothera pallida, Salsola tragus, and 

Sphaeralcea parvifolia. Cryptogams may be absent or may provide up to 40% cover. 

Classification confidence: 1 - Strong. 


Globally. This association is distinguished from other Artemisia filifolia shrubland associations 

by its restriction to the Colorado Plateau, the somewhat mixed shrub canopy that usually 

includes Atriplex canescens, a poorly-developed herbaceous layer and often a number of species 

that indicate disturbance or somewhat alkaline conditions. This association also occurs 

in a broader range of habitats than other Artemisia filifolia types. However, Artemisia filifolia - 

Ephedra (torreyana, viridis) Shrubland is poorly defined, and many stands of Artemisia filifolia 

Colorado Plateau Shrubland contain one or the other species of Ephedra; it is possible that 

these two associations should be combined. 

Petrified Forest National Park. Artemisia filifolia Colorado Plateau Shrubland was distinguished 

from Artemisia filifolia / Bouteloua eriopoda Shrubland by a higher shrub cover and 

a diverse herbaceous layer that is not dominated by either Bouteloua eriopoda or Bouteloua 

gracilis. 

C20








Alliance name 


Artemisia filifolia.Shrubland.Alliance.(A.816),. 

Sandsagebrush.Shrubland.Alliance 


CES304.775 

CES304.793 





Global rank. GNR (14-Aug-2001). 

Distribution: 

Globally. This sand sagebrush shrubland association is widespread on sandy sites in the Colorado 

Plateau of Utah, Colorado, Arizona and New Mexico. 

Petrified Forest National Park. Artemisia filifolia Colorado Plateau Shrubland was identified 

from seven relevés within Petrified Forest National Park. All of these relevés occurred on 

sandy surfaces or sand dunes. They were sampled throughout the monument and included the 

northern wilderness area southeast of Pintado Point and west of Lithodendron Wash, west of 

Dry Wash and west of Crystal Forest, near The Flattops extending to the southern wilderness 

area, and south of Jim Camp Wash. 


Globally. This sand sagebrush shrubland association is widespread on sandy sites in the 

Colorado Plateau of Utah, Colorado, Arizona, and New Mexico. This common shrubland association 

occurs on sandy sites on valley floors, valley sides, stream terraces, stabilized dunes 

and sandsheets, benches, floodplains, and alluvial fans. Most sites are level to gently sloping, 

with a few on moderate slopes (up to 21%), and may be oriented to any aspect, although there 

is a slight tendency to occur on warmer southerly aspects. Elevations range from 1122 to 1769 

m (3680-5803 ft). Sand or bare soil covers most of the unvegetated ground surface, although 

cryptobiological soil crusts may have up to 40% cover. Soils are sandy and derived from local 

sandstones, alluvium, or eolian deposits. 

Petrified Forest National Park. This association occurred between 1622 and 1730 m (5525- 

5700 ft) elevation. Slope ranged from none to moderate (0-18%, average 7%). Only one relevé 

had any surface rocks—a mixture of basalt and sandstone. 



Globally. Total vegetation cover ranges broadly, from sparsely vegetated disturbed and alluvial 

terrace sites with less than 5% total cover to stable, well-developed communities with more 

than 50% cover. Regardless of cover, the vegetation is characterized by an open shrub canopy 

of Artemisia filifolia, usually mixed with other shrubs, especially Atriplex canescens, Ericameria 

nauseosa, and Opuntia spp. Less commonly, the shrub layer will include Vanclevea stylosa, 

Eriogonum leptocladon, or Sarcobatus vermiculatus. Coleogyne ramosissima, Ephedra viridis, 

C21


and Ephedra torreyana are generally absent or have relatively low cover (usually



C.3.4. Atriplex canescens / Pleuraphis jamesii Shrubland 




Four-wing.Saltbush./.Galleta.Shrubland 

Fourwing.Saltbush./.James’.Galleta.Shrubland 

CEGL001288 

Summary: 

This broadly defined shrubland association has been reported from the Colorado Plateau and Uinta 

Basin and may occur in the Chihuahuan Desert and eastern California. As defined, this association 

occurs on two distinct types of landforms: alluvial flats and stream terraces with fine-textured, alkaline, 

or saline silty clay loam soils, or on upland flats covered by eolian sand deposits. The vegetation 

is characterized by a sparse to moderately dense shrub layer (10-40% cover) dominated by Atriplex 

canescens with Pleuraphis jamesii dominating the herbaceous layer. Associated shrubs include Ericameria 

nauseosa, Ephedra torreyana, Chrysothamnus viscidiflorus, Krascheninnikovia lanata, Gutierrezia 

sarothrae, Artemisia bigelovii, or Opuntia polyacantha, depending on topographic position and 

substrate. Other graminoids include Achnatherum hymenoides and Sporobolus cryptandrus on sandy 

sites, and Bouteloua gracilis and Sporobolus airoides on fine-textured soil. Forbs generally have low 

cover and may include Sphaeralcea grossulariifolia and Chenopodium spp. Introduced or weedy species, 

such as Bromus tectorum, Descurainia pinnata, and Salsola kali, are common on some sites. 

Classification confidence: 2 - Moderate. 


Globally. As this association is currently defined, it is characterized only by the codominance 

of Atriplex canescens and Pleuraphis jamesii. Its relation to several similar associations is also 

unclear. Most of the information available suggests that the sparse shrub canopy is more typical 

and that this association should not be classified as a shrubland (Miller et al. 1977, Francis 

1986, Von Loh 2000). Because it has a wide distribution (from southern Great Plains to the 

Mojave Desert), stands occur in diverse habitats (clayey bottomland to sand dunes) and vary 

from a sparse to moderate shrub canopy. It is likely that, when more information becomes 

available and the needed classification work is completed, this association will be subdivided. 

The diagnostic species require warm sites with somewhat alkaline soils, so this association 

should be relatively widespread throughout the Colorado Plateau and western Great Plains. 

That it is not may reflect spotty sampling of the region, or it may indicate that this association 

has been mostly altered by grazing. This association may represent a form of Atriplex canescens 

/ Sporobolus airoides Shrubland that has been degraded by domestic livestock grazing. The 

concept of Atriplex canescens / Sporobolus airoides Shrubland includes Pleuraphis jamesii in 

the herbaceous layer. In addition, the species lists for related and equivalent communities cited 

in the References section include both Pleuraphis jamesii and Sporobolus airoides in the herbaceous 

layer. It is possible that these associations should be combined, as it appears they are 

distinguished primarily by which of the two grasses is dominant. It is possible that summerlong 

grazing has reduced or eliminated Sporobolus airoides from many stands in the Colorado 

Plateau, leaving Pleuraphis jamesii and Bouteloua gracilis as more grazing-resistant species. 

Distinguishing these two associations because of different intensities of historic grazing may 

not be ecologically valid. 

Petrified Forest National Park. Since Atriplex canescens / Pleuraphis jamesii Shrubland can be 

a degraded vegetation community with many dead annuals and a low cover of shrubs, this map 

class served as a catch-all in some cases to map many of the flat areas with a mixed herbaceous 

community and low shrub cover that includes a low cover of Atriplex canescens. 

C23





Physiognomic group III.A.5. Extremely.xeromorphic.evergreen.shrubland 

Physiognomic subgroup III.A.5.N. Natural/Semi-natural.extremely.xeromorphic.evergreen. 


Formation name III.A.5.N.b. Facultatively.deciduous.extremely.xeromorphic.subdesert. 


Alliance name 

Atriplex canescens Shrubland.Alliance.(A.869),.Fourwing. 

Saltbush.Shrubland.Alliance 



CES304.793 

CES304.775 

CES304.784 




Inter-Mountain.Basins.Mixed.Salt.Desert.Scrub 


Global rank. G3G4 (1-Feb-1996). 

Distribution: 

Globally. This association has been documented from the Colorado Plateau (Four Corners 

region) of southeastern Utah and southwestern Colorado. It is to be expected in adjacent 

northern Arizona and New Mexico, and probably occurs in the Chihuahuan Desert and 

eastern California. Because the habitat and the diagnostic species are relatively common in this 

region, the association should be widespread; grazing by sheep and cattle may have eliminated 

most stands. The sites used in this description have also been grazed heavily and show high 

cover by disturbance-tolerant herbaceous species. 

Petrified Forest National Park. Atriplex canescens / Pleuraphis jamesii Shrubland was identified 

from four relevés at Petrified Forest National Park. Two relevés occurred on rolling plains; 

the others on a sand dune and a low slope. The relevés were mainly located in the northern 

section of the park on Headquarters Mesa near Kachina Point, near the northern Visitor Center, 

and north of Interstate 40 west of the park road. The association was also located in the 

central neck section of the park north of the Puerco River. 


Globally. This shrubland association occurs in the Colorado Plateau and Uinta Basin of eastern 

Utah and western Colorado and may occur in the Chihuahuan Desert and eastern California. 

Elevation ranges from 300-1900 m. It occurs on two distinct types of landforms: upland 

sites such as sandsheets with coarse-textured soils, or lowland sites such as alluvial flats and 

stream terraces with fine-textured soils. Water tends to pond temporarily in both kinds of sites 

following heavy rainstorms or spring floods; thus salts tend to accumulate in the soils. Sites 

are generally level to gently sloping or may be in nearly undetectable shallow depressions. The 

upland soils are somewhat shallow eolian sands or sandy loams. Lowland sites typically have 

deep, alkaline, saline silty clay loams derived from alluvium. These substrates are generally 

less saline and occur higher in the floodplain than Atriplex canescens / Sporobolus airoides- or 

Atriplex confertifolia-dominated shrublands that prefer saline bottomland sites. 


and 1785 m (5456-5856 ft). Slope was minimal and ranged from none to 3% (average 1%). 

C24




Globally. This broadly defined shrubland association is characterized by a sparse to moderately 

dense canopy (10-40% cover) of shrubs dominated by Atriplex canescens, with a sparse 

to moderate graminoid layer that is dominated by Pleuraphis jamesii. Many stands have the 

appearance of a shrubby grassland and may form a mosaic with rabbitbrush, greasewood or 

shadscale shrublands. Associated shrubs may include Ericameria nauseosa, Ephedra torreyana, 

Ericameria nauseosa, Grayia spinosa, several species of Opuntia, Chrysothamnus 

viscidiflorus, Krascheninnikovia lanata, Gutierrezia sarothrae, and Artemisia bigelovii. Other 

graminoids include Achnatherum hymenoides and Sporobolus cryptandrus on sandy sites, and 

Bouteloua gracilis and Sporobolus airoides on fine-textured soils of lowland sites. Forbs generally 

have low cover and may include Astragalus nuttallianus, Cryptantha crassisepala, Descurainia 

pinnata, Mentzelia albicaulis, Phacelia crenulata, Sphaeralcea grossulariifolia, and Chenopodium 

spp. Introduced species such as Bromus tectorum, Erodium cicutarium, and Salsola kali 

are common on some sites. In many sites, the herbaceous layer is sparse because of a history of 

grazing or other disturbance. 

Petrified Forest National Park. Four relevés were classified as Atriplex canescens / Pleuraphis 

jamesii Shrubland. The total vegetation cover of these relevés varied between 25 and 30% 

(average 28%) with a shrub stratum of 4-8% cover (average 6%) and an herbaceous stratum 

of 18-26% cover (average 22%). Each relevé varied in species diversity between 21 and 30 

species (average 26 species). The shrub layer was relatively patchy, was dominated or codominated 

by Atriplex canescens, and varied between 1 and 6% cover (average 3%). In some of the 

relevés, other shrubs may codominate the association. Pleuraphis jamesii either dominated 

the herbaceous layer or occurred as an indicator species for this association, ranging from 1to 

12% cover (average 6%). Two of these relevés had a high cover of annuals and notable drought 

impacts. Phacelia crenulata covered 9% of one relevé, and Phacelia sp. had a high cover in two 

of the relevés (6 and 10%). 



Short.shrub/ Chrysothamnus viscidiflorus, Atriplex canescens 

sapling 

Ericameria nauseosa, Atriplex 

canescens, Gutierrezia sarothrae, 

Krascheninnikovia lanata 

Herb.(field) Achnatherum hymenoides, Pleuraphis jamesii 

Bouteloua gracilis, Pleuraphis jamesii, 

Sporobolus airoides, Sporobolus 

cryptandrus 



Bromus tectorum, Salsola kali 

PEFO species 


References: 

BLM 1979a, BLM 1979b, Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Diamond 1993, 

Driscoll et al. 1984, Francis 1986, Miller et al. 1977, Shute and West 1978, Soil Conservation Service 

1978, U.S. Bureau of Reclamation 1976, Von Loh 2000, Western Ecology Working Group n.d. 

C25



C.3.5. Ericameria nauseosa Desert Wash Shrubland 




Rubber.Rabbitbrush.Desert.Wash.Shrubland 

Rubber.Rabbitbrush.Desert.Wash.Shrubland 

CEGL002261 

Summary: 

This association is found in or near temporary watercourses on point bars, basin floors, and low 

stream terraces in western Colorado and eastern Utah. Stands have been found between 1189 and 

2104 m (3900-6900 ft) elevation. Sites are flat to gently sloping (


Distribution: 

Globally. This association has been found in western Colorado and eastern Utah. It is likely 

found in other places of the arid western U.S. 

Petrified Forest National Park. Ericameria nauseosa Desert Wash Shrubland was identified 

from eight relevés in Petrified Forest National Park. All of these relevés were associated with 

washes and occurred on bajadas, playas, and talus landforms. They were mostly located in the 

northern half of the project area, including east of Chinde Point in the northern wilderness 

area, southwest of Pintado Point near the Lithodendron Wash, the northwestern corner of the 

park near Digger Wash, and on the northern and eastern slopes of Chinde Mesa. The association 

also occurred in the central neck area of the park north of the Puerco River and south of 

Interstate 40 near the northern headquarters offce. 


Globally. This association is found in or adjacent to temporary watercourses on point bars, 

basin floors, and low stream terraces. Stands have been found between 1189 and 2104 m 

(3900-6900 ft) elevation. Sites are flat to gently sloping (




Tall/short.shrub/ Ericameria nauseosa Ericameria nauseosa 

sapling 

Herb.(field) Achnatherum hymenoides, Pleuraphis jamesii 

Bouteloua gracilis, Pleuraphis jamesii, 

Sporobolus airoides, Sporobolus 





PEFO species 


References: 


C28



C.3.6. Forestiera pubescens Shrubland 




Not.mapped 

Wild.Privet.Shrubland 

CEGL001168 

Summary: 

This shrubland association is reported from canyon bottoms, floodplains, sandy terraces along major 

rivers, and washes in southwestern Colorado, northeastern Arizona, and southeastern Utah. Elevation 

ranges from 1340 to 1680 m (4400-5500 ft). Stands typically form a narrow, but continuous, band 

about 3 m above the channel on streambanks and natural levees at the interface between the riparian 

zone and drier uplands. They occur on the outer edge of the active floodplain. Soils range from silty 

clays over clay loam to sandy loam derived from alluvium. This shrubland consists of a dense to open 

canopy of Forestiera pubescens, often with Atriplex canescens, Ericameria nauseosa, or Rhus trilobata, 

on the flat benches and floodplains adjacent to and above the river channel. There is often a mix of 

riparian and upland vegetation in these areas, with Salix exigua forming a dense band along the stream 

edge. This dense riparian shrubland can form a narrow, unfragmented, continuous cover that may 

alternate creekside to creekside, as part of the natural mosaic of the floodplain for one-tenth of a mile 

to several miles. Phragmites australis, a tall erect grass, or Sporobolus airoides often occur among the 

shrubs, with Artemisia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), or pinyon-juniper 

dominating the adjacent upland vegetation. The dominance or codominance Forestiera pubescens 

in the shrub layer characterizes this association. 



Globally. More survey and classification work is needed to clarify the concept of this association 

throughout its range. It may be possible to split into more associations based on understory 

dominants. 

Petrified Forest National Park. Data are not available. 



Physiognomic subclass III.B. Deciduous.shrubland 

Physiognomic group III.B.2. Cold-deciduous.shrubland 

Physiognomic subgroup III.B.2.N. Natural/Semi-natural.cold-deciduous.shrubland 

Formation name III.B.2.N.d. Temporarily.flooded.cold-deciduous.shrubland 

Alliance name 

Forestiera pubescens.Temporarily.Flooded.Shrubland. 

Alliance.(A.969),.Wild.Privet.Temporarily.Flooded. 

Shrubland.Alliance 



CES306.821 




C29



Global rank. G1G2 (30-Nov-1998). The Forestiera pubescens riparian shrubland has not been 

documented outside of a few locations in Colorado. It probably occurs in Utah, Arizona, and 

New Mexico, although not in any great abundance. Indications of its possible presence are 

inferred from (1) the Flora of Utah, which lists fourteen collections of Forestiera pubescens 

from sandy terraces along the Colorado and San Juan rivers, and smaller tributaries in Emery, 

Garfield, Grand, Kane, San Juan, and Wayne counties (Welsh et al. 1987), and (2) Arizona 

floras that list Forestiera pubescens as Forestiera neomexicana (a synonym), but do not record 

the number or location of the collections. Livestock grazing is limited in this plant association 

due to the dense shrub cover, and Forestiera pubescens is not very palatable to livestock. 

Distribution: 

Globally. This association is known from Colorado in the San Miguel/Dolores River Basin. 

Petrified Forest National Park. This association occurred adjacent to the Puerco River west 

of U.S. Highway 191. 


Globally. This shrubland association is reported from canyon bottoms, floodplains, sandy 

terraces along major rivers, and washes in southwestern Colorado, northeastern Arizona, and 

southeastern Utah. Elevation ranges from 1340 to 1680 m (4400-5500 ft). Stands typically 

form a narrow, but continuous, band about 3 m above the channel on streambanks and natural 

levees at the interface between the riparian zone and drier uplands. They occur on the outer 

edge of the active floodplain. Soils range from silty clays over clay loam to sandy loam derived 

from alluvium.. 

Petrified Forest National Park. This association occurred in a valley bottom at 1503 m (4930 

ft) elevation. The site was a level, intermittently flooded area adjacent to the Puerco River. The 

substrate was a sandy loam soil. 



Globally. This shrubland consists of a dense to open canopy of Forestiera pubescens, often 

with Atriplex canescens, Ericameria nauseosa, or Rhus trilobata, on the flat benches and floodplains 

adjacent to and above the river channel. There is often a mix of riparian and upland 

vegetation in these areas, with Salix exigua mixing or forming a dense band along the stream 

edge. This dense riparian shrubland can form a narrow, unfragmented, continuous cover that 

may alternate creekside to creekside, as part of the natural mosaic of the floodplain for onetenth 

of a mile to several miles. Phragmites australis, a tall erect grass, or Sporobolus airoides 

often occur among the shrubs. Common forbs include Descurainia pinnata, Chenopodium 

album, and Stanleya pinnata. The invasive, exotic shrub Tamarix chinensis may be present to 

codominant in some stands. Artemisia tridentata, Ericameria nauseosa, or pinyon-juniper 

often dominate the adjacent upland vegetation. This appears to be a flood-tolerant association 

which may be excluded from grazing due to the density of shrub cover. 

Petrified Forest National Park. Only one relevé was classified as Forestiera pubescens Shrubland, 

with total vegetation cover of 56%. The vegetation cover consisted of 37% cover in the 

shrub stratum and 19% cover in the herbaceous stratum. The species diversity was low, with 

only six species. The shrub layer was characterized by Forestiera pubescens with 12% cover and 

with common associates Atriplex canescens (7% cover) and Ericameria nauseosa (14% cover). 

The herbaceous layer was dominated by Sporobolus airoides with 18% cover. 

C30



Stratum 

Tall.shrub/sapling 

Short.shrub/ 

sapling 

Herb.(field) 


Forestiera pubescens 

N/A 

N/A 

PEFO species 

Forestiera pubescens 

Ericameria nauseosa 

Sporobolus airoides 




PEFO species 


References: 

Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Carsey et al. 2003a, Driscoll et al. 1984, 

Kittel and Lederer 1993, Kittel et al. 1999b, Welsh et al. 1987, Western Ecology Working Group n.d. 

C31



C.3.7. Gutierrezia sarothrae - (Opuntia spp.) / Pleuraphis jamesii Dwarf-shrubland 




Snakeweed.–.(Prickly.Pear)./.Galleta.Dwarf-shrubland 

Snakeweed.-.(Prickly-pear.species)./.James’.Galleta.Dwarfshrubland 

CEGL002690 

Summary: 

This dwarf-shrubland was described from Utah and northern Arizona where it occurs on level to 

gently sloping hillslopes, plateaus and bluffs. Aspects are reported from the southeast, south, and 

southwest. Soils are variable, but tend to be fine-textured and may occur over gravel and cobbles. 

Disturbance may be important in maintaining the vegetation community as some stands have been 

created by chaining of trees and improper grazing by livestock. This broadly defined association 

is characterized by an open dwarf-shrub canopy (10-30% cover) that is dominated by Gutierrezia 

sarothrae, frequently with Opuntia spp. and an herbaceous layer with Pleuraphis jamesii present to 

abundant (1-30% cover). Some stands have a diverse woody layer that includes low cover of several 

shrub species and occasional Pinus edulis or Juniperus osteosperma trees. The herbaceous layer is typically 

dominated by graminoids with several species present including Pleuraphis jamesii, Achnatherum 

hymenoides, Aristida purpurea, Bouteloua gracilis, Elymus elymoides, Hesperostipa comata, or Pascopyrum 

smithii. There is usually only sparse cover of native forbs like Chamaesyce spp. or Sphaeralcea 

coccinea. Introduced species such as Bromus tectorum or Salsola kali may dominate the herbaceous 

layer of some disturbed stands. 

Classification confidence: 3 - Weak. 


Globally. This broadly defined dwarf-shrubland includes stands that could also be classified 

as a dwarf-shrub herbaceous association. 

Petrified Forest National Park. Gutierrezia sarothrae tended to be a rather ubiquitous species 

that occurred with notable cover in many associations. These two relevés were classified 

as this specific association due to their high cover of Gutierrezia sarothrae without any other 

dominant or diagnostic shrubs in the shrub layer. 


Physiognomic class IV Dwarf-shrubland 

Physiognomic subclass IV.B. Deciduous.dwarf-shrubland 

Physiognomic group IV.B.2. Cold-deciduous.dwarf-shrubland 

Physiognomic subgroup IV.B.2.N. Natural/Semi-natural.cold-deciduous.dwarf-shrubland 

Formation name IV.B.2.N.a. Cespitose.cold-deciduous.dwarf-shrubland 

Alliance name 

Gutierrezia sarothrae.Dwarf-Shrubland.Alliance.(A.2528),. 

Snakeweed.Dwarf-shrubland.Alliance 



CES304.788 


Inter-Mountain.Basins.Semi-Desert.Shrub-Steppe 

C32



Distribution: 

Global rank. GNR (26-Jul-2001). 

Globally. This association is described from Utah and northern Arizona, but is likely more 

widespread throughout the semi-arid western U.S. 

Petrified Forest National Park. Gutierrezia sarothrae - (Opuntia spp.) / Pleuraphis jamesii 

Dwarf-shrubland was identified from two relevés in Petrified Forest National Park. One relevé 

was sampled on a sand dune/sandsheet and the other on a midslope with talus. One of the 

relevés was sampled south of Interstate 40 and south of the northern headquarters offce and 

the other was sampled in the southwestern corner of the northern wilderness area, west of 

Wildhorse Wash. 


Globally. This association is described from Utah and northern Arizona where it occurs on 

level to gently sloping hillslopes, plateaus, and bluffs. Elevations range from 1350 to 2000 m. 

Aspects are reported from the southeast, south, and southwest. Soils are variable, but tend to 

be fine-textured and may occur over gravel and cobbles. Disturbance may be important in 

maintaining this vegetation community as some stands may have been created by chaining of 

trees and improper grazing by livestock. 

Petrified Forest National Park. This association occurred at elevations of 1700 and 1720 m 

(5650 and 5590 ft). The slopes of these relevés were moderate at 3 and 13%. 



Globally. This broadly defined association is characterized by an open dwarf-shrub canopy 

(10-30% cover) dominated by Gutierrezia sarothrae, frequently with Opuntia spp. and an herbaceous 

layer with Pleuraphis jamesii present to abundant (0-30% cover). Some stands have 

a diverse woody layer that includes low cover of Artemisia nova, Atriplex canescens, Atriplex 

confertifolia, Chrysothamnus viscidiflorus, Coleogyne ramosissima, Ephedra spp., Eriogonum 

spp., Grayia spinosa, Lycium pallidum, Purshia tridentata, or occasional Pinus edulis or Juniperus 

osteosperma trees. The herbaceous layer is typically dominated by graminoids with several 

species present including Pleuraphis jamesii, Achnatherum hymenoides, Aristida purpurea, 

Bouteloua gracilis, Elymus elymoides, Hesperostipa comata, or Pascopyrum smithii. There is usually 

only sparse cover of native forbs like Chamaesyce spp. or Sphaeralcea coccinea; however, 

introduced species such as Bromus tectorum, Erodium cicutarium, Sisymbrium altissimum, or 

Salsola kali may dominate the herbaceous layer of some disturbed stands. 

Petrified Forest National Park. Two relevés were classified Gutierrezia sarothrae - (Opuntia 

spp.) / Pleuraphis jamesii Dwarf-shrubland with total vegetation cover of 16 and 28%. The 

vegetation cover consisted of the shrub stratum with 11 and 16% cover and the herbaceous 

stratum with 5 and 12% cover. Species diversity was 26 and 34 species. The vegetation in the 

shrub layer was dominated by Gutierrezia sarothrae with 3 and 14% cover. The Opuntia sp. 

shrubs covered just 0.5% in both relevés. Pleuraphis jamesii was a significant species in the 

herbaceous layer with 3% cover in both relevés. 



Short.shrub/ Gutierrezia sarothrae Gutierrezia sarothrae 

sapling 

Herb.(field) Pleuraphis jamesii Pleuraphis jamesii 

C33





PEFO species 


References: 

Cogan et al. 2004, Stubbendieck et al. 1992, USFS 1937, Von Loh et al. 2002, Western Ecology Working 

Group n.d. 

C34



C.3.8. Isocoma drummondii - Pleuraphis jamesii Shrubland [Park Special] 




Drummond.Goldenweed.-.Galleta.Shrubland 

Drummond’s.Jimmyweed.-.James’.Galleta.Shrubland.[Park. 

Special] 

Park.Special 

Summary: 

This Isocoma drummondii dominated sand deposit association has only been described from Petrified 

Forest National Park. Until further inventory is completed, there is no global information. 




Petrified Forest National Park. This community type was newly described during the community 

classification process of this project. One relevé was sampled; however, the unique 

species composition did not allow this relevé to be placed into any of the existing NVCS communities. 

Since we only had one relevé of this unique community type and three relevés in a 

similar community type during an earlier classification effort (Thomas et al. 2003), we did not 

have enough data to develop a new NVCS association. Therefore, this community type was 

described as a unique local community type or a park special until further data are collected. 


Physiognomic class N/A N/A 

Physiognomic subclass N/A N/A 

Physiognomic group N/A N/A 

Physiognomic subgroup N/A N/A 

Formation name N/A N/A 

Alliance name 

N/A 



CES304.775 




Global rank. Data are not available. 

Distribution: 

Globally. This association has only been described from Petrified Forest National Park. Until 

further inventory is completed, there is no global information. 

Petrified Forest National Park. Only one relevé was sampled of Isocoma drummondii - 

Pleuraphis jamesii Shrubland (Park Special). It was located on a sand dune/sandsheet north of 

Petrified Forest National Park on the eastern slopes of Chinde Mesa. 

C35





Petrified Forest National Park. This community type occurred at 1761 m (5776 ft) elevation. 

There was not a significant slope (1%). Surface rocks consisted of mudstone. 





Petrified Forest National Park. One relevé was classified as Isocoma drummondii - Pleuraphis 

jamesii Shrubland (Park Special), with total vegetation cover of 13%. The vegetation cover 

consisted of 8% cover in the shrub stratum and 5% cover in the herbaceous stratum. The species 

diversity was 15 species for this relevé. The vegetation in the shrub layer was dominated by 

Isocoma drummondii with 3% cover, and the vegetation in the herbaceous layer was dominated 

by Pleuraphis jamesii with 1% cover. 



Short.shrub/ N/A Isocoma drummondii 

sapling 

Herb.(field) N/A Pleuraphis jamesii 




PEFO species 

Atriplex confertifolia, Sporobolus 


References: 

Thomas et al. 2003. 

C36



C.3.9. Iva acerosa - Sporobolus airoides Shrubland [Park Special] 




Copperweed.-.Alkali.Sacaton.Shrubland 

Copperweed.-.Alkali.Sacaton.Shrubland.[Park.Special] 

Park.Special 

Summary: 

This Iva acerosa dominated wash association has only been described from Petrified Forest National 

Park. Until further inventory is completed, there is no global information. 




Petrified Forest National Park. This community type was newly described during the 

community classification process of this project. Only one relevé was sampled; however, the 

unique species composition did not allow this relevé to be placed into any of the existing 

NVCS communities. Since we only had one relevé of this unique community type and three 

relevés in a similar community type during an earlier classification effort (Thomas et al. 2003), 

we did not have enough data to develop a new NVCS association. Therefore, this community 

type was described as a unique local community type or a park special until further data are 

collected. 







Alliance name 

N/A 



CES304.781 





Distribution: 



Petrified Forest National Park. Iva acerosa - Sporobolus airoides Shrubland (Park Special) 

was sampled at one relevé within Petrified Forest National Park. This relevé was located in a 

wash that has periodic streamflow on a bajada-like landform on the southwestern slopes of 

Chinde Mesa. 

C37





Petrified Forest National Park. This association occurred at 1790 m (5860 ft) elevation with 

little slope (5%). This relevé had a presence of mudstone surface rocks. 





Petrified Forest National Park. Only one relevé was classified as Iva acerosa - Sporobolus 

airoides Shrubland (Park Special), with total vegetation cover of 30%. This vegetation cover 

consisted of 20% cover in the shrub stratum and 10% cover in the herbaceous stratum. The 

species diversity for this relevé was 26 species. The vegetation in the shrub layer was dominated 

by Iva acerosa with 8% cover. Parryella filifolia also had a fairly high cover in the shrub 

layer with 4% cover. Sporobolus airoides dominated the herbaceous cover (7% cover). 



Short.shrub/ N/A Iva acerosa, Parryella filifolia 

sapling 





PEFO species 

Atriplex confertifolia, Hymenoxys 

richardsonii 

References: 


C38



C.3.10. Krascheninnikovia lanata / Bouteloua gracilis Dwarf-shrub Herbaceous Vegetation 




Winter-fat./.Blue.Grama.Dwarf-shrubland 

Winter-fat./.Blue.Grama.Dwarf-shrub.Herbaceous.Vegetation 

CEGL001321 

Summary: 

This widespread, open dwarf-shrub type is found in the western Great Plains from eastern Wyoming, 

western Kansas, Colorado, and New Mexico to the Colorado Plateau and semi-desert mountains in 

the northern Chihuahuan Desert. This shrub herbaceous association occurs on alluvial flats, plains, 

mesas, and desert mountains. Stands occupy flat to gentle slopes between 1630 and 2080 m (5360- 

6820 ft) elevation. Ground cover is largely bare soil. In Colorado Plateau stands, there is often significant 

cover of biotic crusts (to 30% cover). The sometimes rocky soils are typically shallow, alkaline, 

calcareous and loamy or clayey in soil texture and are derived from shale or alluvium. The vegetation 

is characterized by an open dwarf-shrub canopy of Krascheninnikovia lanata and an understory 

dominated by Bouteloua gracilis. Other shrubs may be present with very low cover, including Artemisia 

nova, Atriplex spp., Ephedra viridis, Gutierrezia sarothrae, Opuntia imbricata, and Opuntia polyacantha. 

Associated graminoids present may include Achnatherum hymenoides, Aristida purpurea, 

Elymus elymoides, Hesperostipa comata, Muhlenbergia torreyi, Pascopyrum smithii, Pleuraphis jamesii, 

Sporobolus airoides, and Sporobolus cryptandrus. Forb cover is typically low but may be diverse. 




Petrified Forest National Park. Although Gutierrezia sarothrae had higher cover than Krascheninnikovia 

lanata, it was not chosen as the species determined to drive the community 

description since it tends to be a ubiquitous species throughout the park. 


Physiognomic class V Herbaceous.Vegetation 

Physiognomic subclass V.A. Perennial.graminoid.vegetation 

Physiognomic group V.A.8. Temperate.or.subpolar.grassland.with.a.sparse.dwarfshrub.layer 

Physiognomic subgroup V.A.8.N. Natural/Semi-natural.temperate.or.subpolar.grassland. 

with.a.sparse.dwarf-shrub.layer 

Formation name V.A.8.N.a. Short.temperate.or.subpolar.lowland.grassland.with.a. 

sparse.needle-leaved.or.microphyllous.dwarf-shrub.layer 

Alliance name 

Krascheninnikovia lanata Dwarf-Shrub.Herbaceous. 

Alliance.(A.1565),.Winter-fat.Dwarf-shrub.Herbaceous. 

Alliance 



CES304.788 





C39


Distribution: 

Globally. This widespread, open dwarf-shrub type is found in the western Great Plains from 

western Kansas and eastern Colorado, to semi-desert mountains (Oscura and San Andres 

mountains) in south-central New Mexico and Colorado Plateau (northern Arizona and southern 

Utah). This association is likely more widespread since its dominant/diagnostic species are 

common in the western U.S. 

Petrified Forest National Park. Krascheninnikovia lanata - Bouteloua gracilis Dwarf-shrub 

was identified from one relevé at Petrified Forest National Park. This one relevé occurred on a 

sand dune/sandsheet and was located in the central neck of the park in the open plains. 


Globally. This widespread, open dwarf-shrub type is found in the western Great Plains 

from eastern Wyoming, western Kansas, Colorado, and New Mexico semi-desert mountains 

(Oscura and San Andres mountains in south-central New Mexico) and Colorado Plateau. This 

shrub herbaceous association occurs on alluvial flats, plains, mesas, and desert mountains. 

Stands occupy flat to gentle slopes between 1630 and 2080 m (5360-6820 ft) elevation. Ground 

cover is largely bare soil. In Colorado Plateau stands, there is often significant cover of biotic 

crusts (to 30% cover). The sometimes rocky soils are typically shallow, alkaline, calcareous 

and loamy or clayey in soil texture and are derived from shale or alluvium (Francis 1986, Lauver 

et al. 1999, Muldavin et al. 2000b). In Kansas, stands occur in areas with sparse vegetation 

on uplands and flats. Soils are shallow, rocky, and alkaline (Lauver et al. 1999). 

Petrified Forest National Park. This association occurred at an elevation of 1717 m (5633 ft). 

The slope was minimal (2%). 



Globally. The vegetation contains an open shrub and graminoid layer. The dwarf-shrub layer 

is about 0.5 m tall, containing annual stems from a woody rootstock, and microphyllous leaves. 

The dominant dwarf-shrub is Krascheninnikovia lanata. The sparse to dense herbaceous layer 

is dominated by Bouteloua gracilis. Other shrubs may be present with very low cover, including 

Artemisia nova, Atriplex spp., Ephedra viridis, Gutierrezia sarothrae, Opuntia imbricata, and 

Opuntia polyacantha. Associated graminoids present may include Achnatherum hymenoides, 

Aristida purpurea, Elymus elymoides, Hesperostipa comata, Muhlenbergia torreyi, Pascopyrum 

smithii, Pleuraphis jamesii, Sporobolus airoides, and Sporobolus cryptandrus (Francis 1986, 

Muldavin et al. 2000b). Forb cover is typically low but may be diverse. Common species in 

the Colorado Plateau are Chaetopappa ericoides, Cryptantha crassisepala, Gilia leptomeria, 

Helianthus petiolaris, Machaeranthera canescens, Mentzelia albicaulis, Plantago patagonica, 

Senecio spartioides, and Sphaeralcea coccinea; Glandularia bipinnatifida is the most constant in 

mountains of south-central New Mexico. In Kansas, Stanleya pinnata, a subshrubby perennial 

from a woody base, can be over 1 m tall and is often present; Echinacea angustifolia and Liatris 

punctata often codominate with Bouteloua gracilis in the herbaceous layer. Exotic annual grass 

Bromus tectorum is frequently present in disturbed stands. 

Petrified Forest National Park. Only one relevé was classified as Krascheninnikovia lanata 

- Bouteloua gracilis Dwarf-shrub, with total vegetation cover of 26%. This vegetation cover 

consisted of 13% cover in the shrub stratum and 13% cover in the herbaceous stratum. The 

species diversity was 23 species. The vegetation in the shrub layer was dominated by Krascheninnikovia 

lanata with 5% cover and Gutierrezia sarothrae with 6% cover. The herbaceous 

layer was dominated by Bouteloua gracilis with 5% cover. 

C40



Stratum 

Short.shrub/ 

sapling 

Herb.(field) 



Bouteloua gracilis 

PEFO species 


Bouteloua gracilis 




PEFO species 


References: 

BIA 1979, Bourgeron and Engelking 1994, Driscoll et al. 1984, Francis 1986, Johnston 1987, Lauver et 

al. 1999, Muldavin and Mehlhop 1992, Muldavin et al. 1998d, Muldavin et al. 2000b, Soil Conservation 

Service 1978, Western Ecology Working Group n.d. 

C41



C.3.11. Krascheninnikovia lanata Dwarf-shrubland 




Krascheninnikovia lanata.Dwarf-shrubland.was.not.mapped. 

as.a.separate.map.class.because.it.lacked.a.definable. 

photosignature.and.had.only.one.representative.relevé..This. 

one.location.was.incorporated.within.the.map.class.Four-wing. 

Saltbush./.Galleta.Shrubland.. 

Winter-fat.Dwarf-shrubland 

CEGL001320 

Summary: 

This association is known from Colorado Plateau west into the Great Basin and northern Mojave 

Desert and east into the northern panhandle of Texas and is likely to be more widespread in similar 

habitats in the southwestern Great Plains. It is an alkaline dwarf-shrub association that occurs primarily 

on sandsheets, slopes, and plains often on eolian deposits near canyon walls and in alkaline flats in 

and around playas and along washes. Sites are flat to steep (up to 40% slope) and occur between 800 

and 1770 m (2620-5800 ft) elevation. Soils are rapidly drained loamy sands or sandy loams derived 

from alluvium from a variety of parent materials and sandstones that have eroded and been redeposited 

by wind and water. It occurs on low to high levels of soil salinity and alkalinity. Total vegetation 

cover ranges from 5 to 45% and is characterized by the dwarf-shrub Krascheninnikovia lanata 

with cover between 5 and 30%. In southern Nevada, scattered Ambrosia dumosa, Atriplex polycarpa, 

Larrea tridentata, Lycium andersonii, Sphaeralcea ambigua, and Suaeda moquinii (= Suaeda fruticosa) 

may be present. The herbaceous layer is poorly developed but may contain tufts of the grass 

Achnatherum hymenoides. Forbs commonly present include Eriogonum spp., Opuntia polyacantha, 

Oenothera pallida, Plantago patagonica, and Sphaeralcea parvifolia. Biological soil crusts may provide 

up to 45% cover. Introduced annuals Bromus tectorum, Bromus rubens, and Salsola tragus may be 

abundant on some sites. 



Globally. This is a broadly defined association that includes stands from the Colorado Plateau, 

Great Basin, and northern Mojave Desert characterized by the dominance of Krascheninnikovia 

lanata without a notable herbaceous layer. The herbaceous layer is typically absent 

or sparse or dominated by introduced species such as Bromus tectorum or Salsola tragus. This 

is a very-small-patch association as presently defined from Lake Meredith National Recreation 

Area, Texas. The concept will need further review to determine if it is a viable association 

or should be considered as patches within a broader association. 

Petrified Forest National Park. Only one relevé was sampled of this association. More 

samples are needed to fully characterize this association at the park. 


Physiognomic class IV Dwarf-shrubland 

Physiognomic subclass IV.A. Evergreen.dwarf-shrubland 

Physiognomic group IV.A.2. Extremely.xeromorphic.evergreen.dwarf-shrubland 

Physiognomic subgroup IV.A.2.N. Natural/Semi-natural.extremely.xeromorphic.evergreen. 

dwarf-shrubland 

Formation name IV.A.2.N.a. Extremely.xeromorphic.evergreen.subdesert.dwarfshrubland 

Alliance name 

Krascheninnikovia lanata.Dwarf-Shrubland.Alliance. 

(A.1104),.Winter-fat.Dwarf-shrubland.Alliance 

C42




CES304.775 




Distribution: 

Global rank. G5? (23-Feb-1994). 

Globally. This association is known from the Colorado Plateau west into the Great Basin and 

northern Mojave Desert. 

Petrified Forest National Park. Krascheninnikovia lanata Dwarf-shrubland was identified 

from one relevé. It was located on a sand dune/sandsheet at Petrified Forest National Park 

northwest of Pilot Rock. 


Globally. This association is known from the Colorado Plateau west into the Great Basin and 

northern Mojave Desert and in the panhandle of Texas. It is an alkaline dwarf-shrub association 

that occurs primarily on sandsheets, slopes, and plains often on eolian deposits near 

canyon walls and in alkaline flats in and around playas and along washes. Sites are gentle to 

steep (up to 40% slope) and occur between 800 and 1770 m (2620-5800 ft) elevation. Soils are 

rapidly drained loamy sands from alluvium derived from a mixture of rocks such as granodiorite, 

quartzite, latite, limestone, and basalt in southern Nevada (Faden 1977) and sandy loams 

derived from Navajo and Entrada sandstones in southeastern Utah that have eroded and been 

redeposited by wind and water. It occurs on low to high levels of soil salinity and alkalinity. 

In Texas, this community occurs on shallow soils on ridges and on footslopes along the Canadian 

River. In general, the soils are redbed-derived and shallow in nature. It would seem that 

this shrub is able to grow on a variety of soils but prefers the shallower, rocky areas. It is often 

found growing in association with other shrubs but may grow alone in small colonies. When 

this community is found, it is never extensive and rarely occupies more than a third of an acre. 

There is usually some evidence of deer browsing on this species, and in areas where it is accessible, 

domestic livestock will browse it as well. 

Petrified Forest National Park. This association occurred at 1770 m (5800 ft) elevation. 



Globally. On the Colorado Plateau, total vegetation cover ranges from 5 to 45% and is characterized 

by the dwarf-shrub Krascheninnikovia lanata with cover between 5 and 30%. In 

southern Nevada, scattered Ambrosia dumosa, Atriplex polycarpa, Larrea tridentata, Lycium 

andersonii, Sphaeralcea ambigua, and Suaeda moquinii (= Suaeda fruticosa) may be present 

(Faden 1977). The herbaceous layer is poorly developed but may contain tufts of the grass 

Achnatherum hymenoides. Forbs commonly present include Eriogonum spp., Opuntia polyacantha, 

Oenothera pallida, Plantago patagonica, and Sphaeralcea parvifolia. Biological soil 

crusts provide up to 45% cover. Introduced annuals Bromus tectorum, Bromus rubens, and 

Salsola tragus may be abundant on some sites. 

In Texas, this small community is dominated by Krascheninnikovia lanata, with some other 

short shrubs also being present in lesser amounts. Associated shrubs present in the community 

include Dalea formosa, Mimosa borealis, Atriplex canescens, and occasionally small 

Prosopis glandulosa. The community gives the appearance of being droughty and forbs are few. 

Tetraneuris scaposa, Gutierrezia sarothrae, Chaetopappa ericoides (= Leucelene ericoides), Paronychia 

jamesii, and Eriogonum longifolium are the most common. The most common grasses 

C43


are Aristida purpurea, Hesperostipa neomexicana (= Stipa neomexicana), Bouteloua gracilis, and 

Bouteloua curtipendula. 


Dwarf-shrubland, with total vegetation cover of 34%. This vegetation cover consisted of 31% 

cover in the shrub stratum and 3% cover in the herbaceous stratum. The species diversity was 

15 species. The vegetation in the shrub layer was dominated by Krascheninnikovia lanata, with 

30% cover. 



Short.shrub/ Krascheninnikovia lanata Krascheninnikovia lanata 

sapling 




PEFO species 


References: 

Bourgeron and Engelking 1994, Driscoll et al. 1984, Faden 1977, Mitchell et al. 1966, NVNHP 2003, 


C44



C.3.12. Purshia stansburiana - Eriogonum corymbosum Shrubland 




Cliff-rose.–.Crispleaf.Buckwheat.Shrubland 

Stansbury’s.Cliffrose.-.Crispleaf.Wild.Buckwheat.Shrubland 

CEGL004011 

Summary: 

This shrubland association is only known from Petrified Forest National Park. The summary that 

follows is derived from data from five relevés. This association occurs on lower slopes, midslopes, terraces, 

and mesas between 1740 and 1920 m (5700-6290 ft) elevation. Slope ranges from none to steep 

(0-22%) (average 9%). Most of the stands have basalt surface rocks, and one has sandstone surface 

rocks. Total vegetation cover ranges from 15 to 24% cover (average 18%). The vegetation is characterized 

by an open shrub layer codominated by Purshia stansburiana and Eriogonum corymbosum, with 

an open to sparse herbaceous stratum (0.5-6% cover). Species diversity ranges from 20 to 24 species. 

Other shrubs are often present with low cover, such as Artemisia bigelovii, Atriplex canescens, Ephedra 

torreyana, Ephedra viridis, Brickellia oblongifolia, and Gutierrezia sarothrae. Common grasses 

and forbs present include Chamaesyce fendleri, Chamaesyce parryi, Cryptantha crassisepala, Phacelia 

crenulata, Elymus elymoides, and exotic annual grass Bromus rubens. 





Petrified Forest National Park. One relevé lacked coverage of Eriogonum corymbosum; however, 

it had similar composition and structure to the other relevés in this association and had a 

significant cover of Purshia stansburiana. This relevé was included in this association for this 

classification effort; however, with additional classification efforts, it may be reclassified. 







Alliance name 

Purshia.(stansburiana, mexicana).Shrubland.Alliance. 

(A.833),.(Stansbury’s.Cliffrose,.Mexican.Cliffrose). 




CES304.765 

CES304.789 


Colorado.Plateau.Mixed.Bedrock.Canyon.and.Tableland 

Inter-Mountain.Basins.Shale.Badland 


Global rank. GNR (14-Feb-2007). 

C45


Distribution: 

Globally. This association is known only from Petrified Forest National Park in northeastern 

Arizona. It likely occurs elsewhere on the Colorado Plateau. 

Petrified Forest National Park. Purshia stansburiana - Eriogonum corymbosum Shrubland 

was identified from five relevés within Petrified Forest National Park. This association occurred 

on various landforms, including lower slopes, midslopes, terraces, and mesas. It was 

located north of Pintado Point on the slopes of Headquarters Mesa, south of Tawa Point near 

the park road, on the northwest slopes of Pilot Rock, on top of Pilot Rock, west of Dry Wash, 

and west of Crystal Forest. 





and 1920 m (5700-6290 ft). Slope ranges from none to steep (0-22%, average 9%). Most of the 

relevés had basalt surface rocks and one had sandstone surface rocks. 



Globally. Five relevés were classified as Purshia stansburiana - Eriogonum corymbosum 

Shrubland, with total vegetation cover varying between 15 and 24% cover (average 18%). This 

vegetation cover consisted of a shrub stratum with 10-18% cover and an herbaceous stratum 

with 0.5-6% cover (average 3%). The species diversity ranged from 20 to 24 species (average 

22 species). The vegetation was dominated in the shrub layer by Purshia stansburiana with 0.5- 

5% cover (average 3%) and Eriogonum corymbosum with 0-3% cover (average 1%). 


Dwarf-shrubland, with total vegetation cover of 34%. This vegetation cover consisted of 31% 

cover in the shrub stratum and 3% cover in the herbaceous stratum. The species diversity was 

15 species. The vegetation in the shrub layer was dominated by Krascheninnikovia lanata, with 

30% cover. 



Tall.shrub/sapling Purshia stansburiana Purshia stansburiana 

Short.shrub/ N/A Eriogonum corymbosum 

sapling 




PEFO species 


References: 


C46



C.3.13. Rhus trilobata - Ephedra (viridis, torreyana) Talus Shrubland 




Three-leafed.Sumac.-.Mormon.Tea.Talus.Shrubland 

Skunkbush.-.(Mormon-tea,.Torrey’s.Joint-fir).Talus.Shrubland 

CEGL003776 

Summary: 

This Colorado Plateau mixed shrub assemblage occurs on steep, rocky colluvial slopes and bedrock 

canyon rims associated with mesas, canyons, benches, ravines, hills, hogbacks, escarpments, and 

valley sides. Slopes are typically moderate and range from level to steep (0-70%), occur between 1238 

and 1700 m (4000-5580 ft) elevation, and tend to occur on southerly to westerly aspects (less often 

east-facing slopes). Soils are shallow and rocky and range from rapidly drained clay loams to sandy 

loams derived from shales and sandstones. It tends to be slightly more mesic than most other talus 

type vegetation. Total vegetation cover is sparse, not exceeding 25%. It is characterized by a scattered 

mixture of shrubs, among which Rhus trilobata var. trilobata and Ephedra torreyana or Ephedra viridis 

are conspicuous and either dominant or codominant. As many as ten other species of shrubs may 

also be present, including Amelanchier utahensis, Artemisia bigelovii, Atriplex confertifolia, Brickellia 

microphylla, Chrysothamnus viscidiflorus, Coleogyne ramosissima, Ericameria nauseosa, Eriogonum 

corymbosum, and Philadelphus microphyllus. Fraxinus anomala is absent, and if Pinus edulis or Juniperus 

osteosperma are present, cover is less than 1%. Herbaceous cover is sparse and variable. Biological 

soil crust formation is rare on these active slopes. 




Petrified Forest National Park. This map class was photointerpreted based on the environmental 

characteristics of the talus slopes, assuming that the three shrub species uniquely 

characterized this habitat type. 






Formation name III.B.2.N.a. Temperate.cold-deciduous.shrubland 

Alliance name 

Rhus trilobata.Shrubland.Alliance.(A.3569),.Skunkbush. 




CES304.765 





C47


Distribution: 

Globally. This association is known from Arches National Park but likely is widespread in the 

canyonlands of the Colorado Plateau in eastern Utah. 

Petrified Forest National Park. Rhus trilobata - Ephedra (viridis, torreyana) Talus Shrubland 

was identified at three relevés on talus slopes within Petrified Forest National Park. The relevés 

were located on talus slopes. This association was recorded from two main locations: one location 

south of Blue Mesa near the Blue Mesa Road and the other north of Jasper Forest in the 

southwestern corner of the park. 


Globally. This Colorado Plateau mixed shrub assemblage occurs on steep, rocky colluvial 

slopes and bedrock canyon rims associated with mesas, canyons, benches, ravines, hills, 

hogbacks, escarpments, and valley sides. Slopes are typically moderate and range from level 

to steep (0-70%), occur between 1238 and 1700 m (4000-5580 ft) elevation, and tend to occur 

on southerly to westerly aspects (less often east-facing slopes). Soils are shallow and range 

from rapidly drained clay loams to sandy loams. Parent materials include shales (Moenkopi 

and Chinle) and sandstones (Cedar Mountain, Navajo, and Wingate). Most of the unvegetated 

surface is covered by gravel, talus, bedrock and large rocks, and occasionally petrified wood. 

There is little dead wood, biological soil crust, or litter. It tends to be slightly more mesic than 

most other talus type vegetation. 

Petrified Forest National Park. Elevation ranged from 1680 to 1700 m (5500-5580 ft). All of 

the relevés were sampled on steep slopes that varied between 45 and 50% (average 47%), with 

variable aspects ranging from an easterly to a southwestern direction. The talus in all of the 

relevés was composed of sandstone. One relevé also had a low cover of surface rocks consisting 

of petrified wood. 



Globally. This shrubland association has sparse to low cover of vegetation, not exceeding 

25% total cover. It is characterized by a scattered mixture of shrubs, among which Rhus 

trilobata var. trilobata and Ephedra torreyana or Ephedra viridis are conspicuous and either 

dominant or codominant. As many as ten other species of shrubs may also be present, including 

Amelanchier utahensis, Artemisia bigelovii, Atriplex confertifolia, Brickellia microphylla, 

Chrysothamnus viscidiflorus, Coleogyne ramosissima, Ericameria nauseosa, Eriogonum corymbosum, 

and Philadelphus microphyllus. Fraxinus anomala is absent or has trace cover, and if 

Pinus edulis or Juniperus osteosperma are present, cover is less than 1%. The herbaceous layer 

may include many species but never provides more than a few percent cover. Achnatherum 

hymenoides, Aristida purpurea, Elymus elymoides, Pleuraphis jamesii, Leymus salinus, and 

exotic annual grasses Bromus rubens or Bromus tectorum are common grasses. Forb compositions 

are variable with frequent species including Artemisia ludoviciana, Chaetopappa ericoides, 

Cryptantha crassisepala, Stanleya pinnata, and Plantago patagonica. Biological soil crust 

formation is rare on these active slopes. 

Petrified Forest National Park. Three relevés were classified as Rhus trilobata - Ephedra (viridis, 

torreyana) Talus Shrubland, with total vegetation cover ranging from 8 to 21% (average 

15%). This vegetation cover consisted of a shrub layer with 6-12% cover (average 9%) and 

an herbaceous layer with 2-9% cover (average 6%). The species diversity ranged from 19 to 

31 species (average 26 species). The vegetation was composed of three indicator shrub species: 

Rhus trilobata, Ephedra viridis, and Ephedra torreyana. Each of these shrub species may 

or may not be present, and their relative proportions to one another varied depending on the 

environmental conditions. In these three relevés, Rhus trilobata ranged from 0 to 2% cover 

(average 1%), Ephedra viridis ranged from 1 to 4% cover (average 3%), and Ephedra torreyana 

ranged from 0 to 0.5% cover (average



Stratum 

Tall.shrub/sapling 

Short.shrub/ 

sapling 


Amelanchier utahensis, Rhus 

trilobata var. trilobata 

N/A 

PEFO species 

N/A 

Rhus trilobata, Ephedra torreyana, 

Ephedra viridis 




PEFO species 


References: 


C49



C.3.14. Salix exigua / Barren Shrubland 




Coyote.Willow.Shrubland 

Coyote.Willow./.Barren.Shrubland 

CEGL001200 

Summary: 

This riparian shrubland is common in the Rocky Mountains, Colorado Plateau, and Great Basin. It is 

composed of nearly pure stands of Salix exigua, with few other species. Exposed gravel, cobbles, or 

sand characterize the ground cover, but an undergrowth of a few, scattered forbs and grasses is usually 

present. This association occurs within the annual flood zone of rivers on point bars, islands, sand or 

cobble bars, and streambanks. 



Globally. In the western Great Plains this association includes stands composed of intermediates 

between Salix interior (= Salix exigua ssp. interior) and Salix exigua (= Salix exigua ssp. 

exigua) (Dorn 1997, G. Kittel pers. comm. 2001). Until recently these taxa were combined at 

the species level (Kartesz 1999). More information on the distribution of introgression between 

Salix interior (= Salix exigua ssp. interior) and Salix exigua (= Salix exigua ssp. exigua) is 

needed to fully understand the ranges of these two species. 

Petrified Forest National Park. The understory of this association was sparse but not totally 

barren. This association may be better classified under a different association classification. 

Currently, the classification is based on pre-existing NVCS association nomenclature and 

might be better classified with additional sampling of Salix exigua communities at Petrified 







Formation name III.B.2.N.d. Temporarily.flooded.cold-deciduous.shrubland 

Alliance name 

Salix.(exigua, interior).Temporarily.Flooded.Shrubland. 

Alliance.(A.947),.(Coyote.Willow,.Sandbar.Willow). 

Temporarily.Flooded.Shrubland.Alliance 



CES306.821 





Global rank. G5 (15-Jun-2001). 

C50


Distribution: 

Globally. This riparian shrubland association is common along waterways of all sizes at lower 

to middle elevations in the Great Basin, Colorado Plateau and Rocky Mountains extending 

out into the western Great Plains along major rivers. 

Petrified Forest National Park. Salix exigua / Barren Shrubland occurred at two relevés 

within Petrified Forest National Park on bajada, playa, and talus landforms. Both these relevés 

were sampled from the same area in the central neck area of the park. The relevés were located 

south of the railroad tracks on the northern edge of the Puerco River, east of the park road, 

and along the corridor of Dead Wash. 


Globally. This riparian shrubland is common in the Rocky Mountains, Colorado Plateau, 

and Great Basin. Elevation ranges from 780-2600 m. This association occurs within the annual 

flood zone of rivers on point bars, islands, sand or cobble bars, and on streambanks occurring 

along a wide variety of stream reaches, from moderately sinuous and moderate-gradient 

reaches. It can form large, wide stands on mid-channel islands in larger rivers or narrow 

stringer bands on small, rocky tributaries. Substrates are typically coarse alluvial deposits of 

sand, silt and, cobbles that are highly vertically stratified from flooding scour and deposition, 

often consisting of alternating layers of finer textured soil with organic material over coarser 

alluvium. Occasionally, this association occurs on deep pockets of sand. The lack of soil development 

and high ground cover of coarse alluvial material are key indicators for this association. 

Petrified Forest National Park. This association occurred at 1630 and 1640 m (5330-5370 ft) 

elevation. Slope was none to slight (0-1%). 



Globally. This riparian association is characterized by a sparse to dense, tall-shrub (1.5-3 

m) canopy composed of Salix exigua, with ground cover of exposed gravel, cobbles, or sand. 

Salix exigua may be the only shrub in the community, or other shrubs and trees may be present 

with relatively low cover, including Alnus incana, Ericameria nauseosa, Rhus trilobata, Salix 

monticola, Salix ligulifolia (= Salix eriocephala var. ligulifolia), Salix irrorata, Salix lucida, Abies 

lasiocarpa, Acer negundo, Populus angustifolia, Populus deltoides, Populus fremontii, and Salix 

gooddingii. A sparse herbaceous layer may be present among the bare soil, gravel, cobbles, or 

boulders, consisting of a wide variety of forbs and graminoids. Mentha arvensis and species of 

Carex, Eleocharis, Juncus, Schoenoplectus, and Equisetum are often present. Introduced species, 

such as Elaeagnus angustifolia, Tamarix spp., Bromus tectorum, Bromus inermis, Elymus 

repens (= Elytrigia repens), Poa pratensis, Agrostis stolonifera (and other exotic forage species), 

Taraxacum offcinale, Conyza canadensis, and Lepidium latifolium have been reported from 

some stands. 

Petrified Forest National Park. Two relevés were classified as Salix exigua / Barren Shrubland, 

with total vegetation cover of 25 and 32%. This vegetation cover consisted of low tree 

cover (0.5%) in one relevé and none in the other, a dominant shrub cover with 20 and 30% 

cover, and a low herbaceous cover of 2 and 5% within the herbaceous stratum. The species 

diversity for the association was 20 and 24 species. The vegetation in the shrub layer was dominated 

by Salix exigua, which had 18 and 22% cover. Ericameria nauseosa had some cover in 

both relevés with 3 and 4% cover. 

C51




Tall.shrub/sapling Salix exigua Salix exigua 



Bromus tectorum, Melilotus 

officinalis, Tamarix chinensis, 

Xanthium strumarium 

PEFO species 


References: 

Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Carsey et al. 2003a, Christy 1973, Cogan 

et al. 2004, Cowardin et al. 1979, Culver et al. 1996, Dorn 1997, Driscoll et al. 1984, Durkin et al. 

1995b, Hall and Hansen 1997, Hansen et al. 1995, Hansen et al. 2004b, IDCDC 2005, Johnston 1987, 

Jones and Walford 1995, Kagan et al. 2004, Kittel and Lederer 1993, Kittel et al. 1994, Kittel et al. 

1995, Kittel et al. 1996, Kittel et al. 1999a, Kovalchik 1987, Manning and Padgett 1995, Muldavin et 

al. 2000a, Padgett 1981, Padgett et al. 1988b, Padgett et al. 1989, Richard et al. 1996, Tuhy and Jensen 

1982, Von Loh et al. 2002, Western Ecology Working Group n.d. 

C52



C.3.15. Salvia pachyphylla Dwarf-shrubland [Park Special] 




Blue.Sage.Dwarf-shrubland 

Rose.Sage.Dwarf-shrubland.[Park.Special] 

Park.Special 

Summary: 

This Salvia pachyphylla dominated badland association has only been described from Petrified Forest 

National Park. Until further inventory is completed, there is no global information. 




Petrified Forest National Park. With only two relevés of Salvia pachyphylla Dwarf-shrubland 

(Park Special) sampled, there was not enough data to develop a new NVCS association for 

this community type. Until additional data are collected, this type will be retained as a Petrified 

Forest National Park Special. However, it is not likely that this community will be sampled 

in areas outside of the NPS boundary since Salvia pachyphylla has a restricted range and is 

isolated to a few small locations in northern Arizona. 







Alliance name 

N/A 



CES304.789 





Distribution: 



Petrified Forest National Park. Salvia pachyphylla Dwarf-shrubland (Park Special) occurred 

on two relevés within Petrified Forest National Park. They were located on mid- and lower 

slopes of Chinde Mesa. 




C53



elevation. The slopes were steep (29-38%) with northeastern and northwestern orientations. 

Both relevés had mudstone surface rocks. 





Petrified Forest National Park. Two relevés were classified as Salvia pachyphylla Dwarfshrubland 

(Park Special), with total vegetation cover of 11 and 19%. This vegetation cover 

consisted of a tree stratum of 2% cover in both relevés, a shrub stratum with 9 and 14% cover, 

and an herbaceous stratum with 0.5 and 3% cover. The species diversity was 20 and 23 species. 

The vegetation in the shrub layer was dominated by Salvia pachyphylla, with 3 and 4% cover. 



Tall.shrub/sapling Data are not available. Salvia pachyphylla 


Global species 

Data are not available. 

PEFO species 

Achnatherum hymenoides, 

Artemisia bigelovii, Bromus 

tectorum, Chaetopappa ericoides, 

Chamaesyce fendleri, Cordylanthus 

wrightii, Cryptantha sp., Ephedra 

torreyana, Eriogonum corymbosum, 

Gutierrezia sarothrae, Hesperostipa 

neomexicana, Juniperus 

monosperma, Parryella filifolia, 

Pleuraphis jamesii, Rhus trilobata, 

Yucca angustissima 

References: 


C54



C.3.16. Sarcobatus vermiculatus / Atriplex obovata Shrubland [Park Special] 




Greasewood./.New.Mexico.Saltbush.Shrubland 

None.assigned.yet 

Not.applicable 

Summary: 



Classification comments: 


Petrified Forest National Park. Data are not available. 







Alliance name 

N/A 



CES304.789 





Distribution: 



Petrified Forest National Park. Sarcobatus vermiculatus / Atriplex obovata Shrubland (Park 

Special) was identified in the field during the photointerpretors’ reconnaissance. Subsequently 

it was documented on 15 accuracy assessment observation sites. However, it was mapped on 

only three map units, two of which are in the park. 




Petrified Forest National Park. This vegetation community occurred at elevations from 1639 

m (5377 ft) to 1682 m (5518 ft). 


C55



Globally. This association has only been described from Petrified Forest National Park. Until further inventory is 

completed, there is no global information. 

Petrified Forest National Park. Fifteen accuracy assessment relevés were identified as Sarcobatus vermiculatus 

/ Atriplex obovata Shrubland. Cover of Sarcobatus vermiculatus ranged from 5 to 25%. Co-dominant plants were 

the dwarf native shrub Atriplex obovata (cover 1 to 25%) and the native grass Sporobolus airoides (cover 1 to 75%). 

Species diversity among the relevés ranged from 3 to 9 species. Sarcobatus vermiculatus was co-dominant with the 

native dwarf-shrub Atriplex obovata. The association was found generally on saline and alkaline soils and in areas 

with periodic sheet flow, often near a wash system. 



Shrub.(field) Data are not available. Sarcobatus vermiculatus 




PEFO species 

Atriplex obovata, Sporobolus 

airoides, Suaeda moquinii 

References: 


C56



C.3.17. Sarcobatus vermiculatus / Suaeda moquinii Shrubland 




Greasewood./.Shrubby.Seepweed.Shrubland 

Black.Greasewood./.Shrubby.Seepweed.Shrubland 

CEGL001370 

Summary: 

This shrubland association is reported from the Colorado Plateau and Columbia Basin. Sites are 

generally flat to gently sloping saline valley bottoms and toeslopes, river floodplains, and playas at 

elevations ranging from 1620 to 1680 m (5315-5500 ft). Soils are deep, saline, alkaline clay loams. The 

vegetation has a generally sparse shrub layer (


Petrified Forest National Park. Sarcobatus vermiculatus / Suaeda moquinii Shrubland was 

identified from only one relevé in Petrified Forest National Park. The one relevé of this community 

type occurred in a valley bottom and drainage channel located in the central neck area 

of the park, between the railroad tracks and the Puerco River. 


Globally. This shrubland association is reported from the Colorado Plateau and Columbia 

Basin. Sites are generally flat to gently sloping saline valley bottoms and toeslopes, along intermittent 

washes, floodplains, and playas at elevations ranging from 1620 to 1680 m (5315-5500 

ft). Soils are deep, saline, alkaline clay loams. 

Petrified Forest National Park. The elevation and slope of this association are not available 

or recorded. This association occurred in a wetland environment with seasonal or intermittent 

flooding. 



Globally. The vegetation has a generally sparse shrub layer (



C.3.18. Suaeda moquinii Shrubland 




Suaeda moquinii.Shrubland.was.not.mapped.as.a.unique. 

association..The.photointerpreters.were.not.able.to. 

distinguish.this.association.on.the.aerial.photography.and.had. 

only.one.ground-sampled.relevé.as.reference..This.association. 

was.mapped.as.an.inclusion.with.the.surrounding.vegetation;. 

the.single.relevé.was.included.with.the.Greasewood./.Shrubby. 

Seepweed.Shrubland.. 

Shrubby.Seepweed.Shrubland 

CEGL001991 

Summary: 

These shrublands occur in desert basins or playas in Nevada, Arizona, and southern and eastern 

California. Sites are generally flat to gently sloping saline valley bottoms, floodplains and playas, saline 

seeps, and along intermittent washes at elevations ranging from sea level to 1640 m (5381 ft). Soils are 

deep, saline, alkaline clay loams. The vegetation has a generally sparse shrub layer that is less than 1.5 

m tall and strongly dominated by Suaeda moquinii with scattered Atriplex polycarpa, Atriplex canescens, 

Allenrolfea occidentalis, or Sarcobatus vermiculatus in some stands. The sparse herbaceous layer 

may include the forbs Bassia hyssopifolia and Salicornia maritima (= Salicornia europaea). Graminoids 

are not abundant except for Distichlis spicata and occasional Sporobolus airoides or Sporobolus 

cryptandrus. The adjacent shrublands are dominated by Sarcobatus vermiculatus or Atriplex spp. 




Petrified Forest National Park. Although Distichlis spicata has higher cover than Suaeda 

moquinii, Suaeda moquinii was determined to be more diagnostic of this community than Distichlis 

spicata, and a new association based on this one relevé that would include both Suaeda 

moquinii and Distichlis spicata was not developed due to the paucity of data. 






Formation name III.B.2.N.c. Intermittently.flooded.cold-deciduous.shrubland 

Alliance name 

Suaeda moquinii.Intermittently.Flooded.Shrubland. 

Alliance.(A.941),.Shrubby.Seepweed.Intermittently. 

Flooded.Shrubland.Alliance 



CES304.786 

CES304.780 


Inter-Mountain.Basins.Playa 

Inter-Mountain.Basins.Greasewood.Flat 



C59


Distribution: 

Globally. This broadly defined shrubland association occurs in saline overlow areas in bottomlands 

in the Great Basin, Mojave, Colorado, and Sonoran deserts, and in the southern part 

of the Great Central Valley of California. The species occurs throughout the western U.S., so 

this type may be more widespread. 

Petrified Forest National Park. Suaeda moquinii Shrubland was identified from one relevé 

along the flats adjacent to the Puerco River in Petrified Forest National Park. 


Globally. These shrublands occur in desert basins or playas in Nevada, Arizona, and southern 

and eastern California. Sites are generally flat to gently sloping saline valley bottoms, floodplains 

and playas, saline seeps, and along intermittent washes at elevations ranging from sea 

level to 1640 m (5381 ft). Soils are deep, saline, alkaline clay loams derived from alluvium. 

Petrified Forest National Park. This association occurred at an elevation of 1640 m (5381 ft). 

The site was a flat, intermittently flooded area adjacent to the Puerco River. 

USFWS wetland system: Lacustrine. 


Globally. This association is characterized by a sparse to open shrub layer less than 1.5 m tall 

that is strongly dominated by Suaeda moquinii sometimes with scattered Atriplex polycarpa, 

Atriplex canescens, Allenrolfea occidentalis, or Sarcobatus vermiculatus. The sparse herbaceous 

layer may include the forbs Bassia hyssopifolia and Salicornia maritima (= Salicornia europaea). 

Graminoids are not abundant except for Distichlis spicata and occasional Sporobolus 

airoides or Sporobolus cryptandrus. 

Petrified Forest National Park. Only one relevé was classified as Suaeda moquinii Shrubland, 

with total vegetation cover of 17%. This vegetation cover consisted of 2% cover in the shrub 

stratum and 15% cover in the herbaceous stratum. The species diversity was low with only 

four species. The shrub layer was dominated by Suaeda moquinii with 6% cover, and the herbaceous 

layer was dominated by Distichlis spicata with 8% cover. 



Short.shrub/ Suaeda moquinii Suaeda moquinii 

sapling 

Herb.(field) Distichlis spicata Distichlis spicata 




PEFO species 


References: 

Bourgeron and Engelking 1994, Donnelly et al. 2006, Driscoll et al. 1984, Faden 1977, NVNHP 2003, 


C60



C.3.19. Tamarix spp. Temporarily Flooded Semi-natural Shrubland 




Tamarisk.Shrubland 

Salt-cedar.species.Temporarily.Flooded.Semi-natural. 


CEGL003114 

Summary: 

This broadly defined association is composed of shrublands which form moderately dense to dense 

thickets on banks of larger streams across the western Great Plains, interior and southwestern U.S., 

and northern Mexico. Stands are dominated by introduced species of Tamarix, including Tamarix ramosissima, 

Tamarix chinensis, Tamarix gallica, and Tamarix parviflora. Tamarix spp. were introduced 

from the Mediterranean and have become naturalized in various sites, including salt flats and other 

saline habitats, springs, and especially along streams and regulated rivers, where it replaces the native 

vegetation, such as shrublands dominated by species of Salix or Prosopis or woodlands of Populus 

spp. A remnant herbaceous layer may be present, depending on the age and density of the shrub layer, 

although in many cases this layer also consists of aggressive exotic species such as Lepidium latifolium. 

Tamarix species have become a critical nuisance along most large rivers in the semi-arid West and, 

because of permanent changes in flood regimes and the diffculty of removing trees, reflect irreversibly 

changed vegetation on many sites. 



Globally. This is a broadly defined plant association that is composed of many diverse Tamarix 

spp.-dominated vegetation communities from a wide variety of environments. Muldavin 

et al. (2000a) described 8 community types that will be reviewed as possible USNVC associations. 

Petrified Forest National Park. This association was dominated by the non-native invasive 

species Tamarix spp. These species are currently invading southwestern riparian systems. This 

map class should be re-evaluated regularly to assess changes in the distribution of this community 

type. Although this map class only occurred in a few polygons, this does not mean 

that Tamarix spp. do not occur in other locations in the project area. The association was 

only mapped in areas larger than the minimum mapping unit and in areas where Tamarix spp. 

dominated the species cover. During the classification field work, this species was identified as 

Tamarix chinensis; however, since the taxonomy of this species is not well-known and appropriate 

keys have not been developed to identify it, we used only the genus level to classify these 

relevés into an association. 






Formation name III.A.4.N.c. Temporarily.flooded.microphyllous.shrubland 

Alliance name 

Tamarix.spp..Semi-Natural.Temporarily.Flooded. 

Shrubland.Alliance.(A.842),.Salt-cedar.species.Seminatural.Temporarily.Flooded.Shrubland.Alliance 

C61




CES306.821 

CES306.821 







Global rank. GNA (invasive) (24-Jul-2001). 

Distribution: 

Globally. This semi-natural shrubland is found along drainages in the semi-arid western 

Great Plains, interior and southwestern U.S. and northern Mexico, from central and eastern 

Montana, south to Colorado, western Oklahoma and Texas, west to California. 

Petrified Forest National Park. Tamarix spp. Semi-natural Temporarily Flooded Shrubland 

was identified from two relevés in Petrified Forest National Park. These relevés occurred on 

bajada and talus landforms in the central neck area of the park along the northern edges of the 

Puerco River, both east and west of the park road. 


Globally. These widespread shrublands are common along larger streams, rivers, and around 

playas in the western U.S. and Mexico. Elevation ranges from 75 m below sea level to 1860 

m. Tamarix spp. have become naturalized in various sites including riverbanks, floodplains, 

basins, sandbars, side channels, springs, salt flats, and other saline habitats. Stands grow especially 

well along regulated rivers where flood-regenerated native species such as Populus are 

declining and the absence of regular scouring floods allows Tamarix seedlings to become established. 

Substrates are commonly thin sandy loam soil over alluvial deposits of sand, gravel, 

or cobbles. 


elevation. Slope ranged from none to low (0-4%). Both of these relevés occurred in areas with 

intermittent or seasonal flooding. 



Globally. This semi-natural shrubland occurs along streams, rivers, and playas where it forms 

a moderate to dense tall-shrub layer that is solely or strongly dominated by species of Tamarix, 

including Tamarix ramosissima, Tamarix chinensis, Tamarix gallica, and Tamarix parviflora. 

Other shrubs may include species of Salix (especially Salix exigua) and Prosopis, Rhus trilobata, 

and Sarcobatus vermiculatus but with low cover (if shrub species are codominant, then the 

stand is classified as a natural shrubland). Scattered Acer negundo, Salix amygdaloides, Populus 

spp., or Elaeagnus angustifolia trees may also be present. Depending on stand age and density 

of the shrub layer, an herbaceous layer may be present. Associated native species include 

Distichlis spicata and Sporobolus airoides, and introduced species include Agrostis gigantea, 

Agrostis stolonifera, and Poa pratensis. Introduced herbaceous species such as Polypogon 

monspeliensis, Conyza canadensis, Lepidium latifolium, and others have been reported from 

shrublands in this association. 

C62


Petrified Forest National Park. Two relevés were classified as Tamarix spp. Semi-natural 

Temporarily Flooded Shrubland, with total vegetation cover of 35 and 39%. This vegetation 

cover consisted of a tree stratum with 0 and 13% cover, a shrub stratum with 19 and 30% 

cover, and an herbaceous stratum of 5 and 7% cover. The species diversity for these two 

relevés was 12 and 23 species. The vegetation was dominated in the shrub and tree layer by the 

non-native invasive shrubs Tamarix spp., with a combined cover of 31 and 30%. 



Tall.shrub/sapling Tamarix chinensis, Tamarix gallica, Tamarix chinensis 

Tamarix parviflora, Tamarix 

ramosissima 



Bromus tectorum, Lepidium 

latifolium, Poa pratensis 

PEFO species 


References: 

Baalman 1965, Carsey et al. 2003a, Cogan et al. 2004, Cowardin et al. 1979, Hansen et al. 1995, Hansen 

et al. 2004b, Hoagland 2000, Holland 1986b, MTNHP 2002b, Muldavin et al. 2000a, NVNHP 

2003, Nachlinger and Reese 1996, Ortenberger and Bird 1933, Paysen et al. 1980, Sawyer and Keeler- 

Wolf 1995, Smith 1989, Stevens and Shannon 1917, Szaro 1989, Ungar 1968, Von Loh et al. 2002, 

Ware and Penfound 1949, Western Ecology Working Group n.d. 

C63


C.4 Herbaceous 

C.4.1. Atriplex obovata / Sporobolus airoides - Pleuraphis jamesii Shrub Herbaceous 





New.Mexico.Saltbush./.Alkali.Sacaton.-.Galleta.Shrub. 


New.Mexico.Saltbush./.Alkali.Sacaton.-.James’.Galleta.Shrub. 


CEGL001775 

Summary: 

This association occurs on alluvial flats in the southern Colorado Plateau in northwestern New 

Mexico and adjacent Arizona at 1680-1811 m (5570-5940 ft) elevation. Slopes are minimal and range 

from 0 to 6%. Soils are typically shallow, alkaline, and calcareous and are derived from alluvium. Soil 

texture ranges from fine sandy loam to silty clay loam. Ground cover is largely bare soil, sometimes 

with high cover of surface rock, including basalt, gravel, and petrified wood. The vegetation is characterized 

by an open dwarf-shrub canopy of Atriplex obovata with a grassy understory dominated by 

Pleuraphis jamesii and Sporobolus airoides. Other shrubs may be present with very low cover, including 

Atriplex confertifolia, Gutierrezia sarothrae, Krascheninnikovia lanata, Opuntia imbricata, Opuntia 

polyacantha, and Sarcobatus vermiculatus. Associated graminoids may include Elymus elymoides, 

Muhlenbergia torreyi, Schedonnardus paniculatus, and Sporobolus cryptandrus. Forb cover is typically 

low but may be diverse. 








Physiognomic group V.A.7. Temperate.or.subpolar.grassland.with.a.sparse.shrub. 

layer 


with.a.sparse.shrub.layer 

Formation name V.A.7.N.e Medium-tall.temperate.or.subpolar.grassland.with.a. 

sparse.needle-leaved.or.microphyllous.evergreen.shrub. 

layer 

Alliance name 

Sporobolus airoides.-.(Pleuraphis jamesii).Shrub. 

Herbaceous.Alliance.(A.1532),.Alkali.Sacaton.-.(James’. 

Galleta).Shrub.Herbaceous.Alliance 



CES304.788 

CES304.784 



Inter-Mountain.Basins.Mixed.Salt.Desert.Scrub 


Global rank. GU (23-Feb-1994). 

C64


Distribution: 


Petrified Forest National Park. Atriplex obovata / Sporobolus airoides - Pleuraphis jamesii 

Shrub Herbaceous Vegetation occurred on twelve relevés. They were located mostly on or 

near sandsheets/sand dunes or near areas with sheetflow drainage or drainage channels. This 

association was sampled throughout the entire extent of the park, including the northern 

wilderness area west of the Black Forest, southwest of Chinde Mesa, and near Lithodendron 

Wash. It was also sampled from the Blue Mesa area, south of Newspaper Rock, southwest of 

Agate Bridge, and west of Crystal Forest and Dry Wash. 


Globally. This association occurred between the elevations of 1640 and 1750 m (5370-5790 

ft). Slopes of the relevés were minimal and ranged from 0 to 6% (average 2%). Rock substrates 

found within this association included basalt, gravel, and petrified wood. At one relevé, the 

presence of desert pavement on the surface was recorded. 


elevation. Slope ranged from none to low (0-4%). Both of these relevés occurred in areas with 

intermittent or seasonal flooding. 



Globally. The vegetation is characterized by an open dwarf-shrub canopy (





PEFO species 


References: 

Bourgeron and Engelking 1994, Driscoll et al. 1984, Francis 1986, Western Ecology Working Group 

n.d. 

C66



C.4.2. Bouteloua eriopoda - Pleuraphis jamesii Herbaceous Vegetation 




Black.Grama.–.Galleta.Herbaceous.Vegetation 

Black.Grama.-.James’.Galleta.Herbaceous.Vegetation 

CEGL001751 

Summary: 

This Colorado Plateau desert grassland has been documented from the upper Rio Puerco watershed 

in northwestern New Mexico, in north-central Arizona and southeastern Utah, and extends south 

to central New Mexico at Sevilleta National Wildlife Refuge. Stands occur on flat to gently sloping 

plains, basin floors, mesatops, and less often on steeply sloping mesa sides. Substrates are variable and 

include loam to clay-loam soils derived from basalt outcrop, shale, clay and sandstone, and coarser 

textured soils derived from black cinders and sandstone. Bouteloua eriopoda and Pleuraphis jamesii 

(= Hilaria jamesii) dominate the low to moderate herbaceous cover. Associates include low cover of 

Aristida purpurea, Bouteloua gracilis, Hesperostipa neomexicana (= Stipa neomexicana), Muhlenbergia 

porteri, Sporobolus airoides, and Sporobolus cryptandrus. Shrubs are few and scattered and may 

include Atriplex canescens, Ephedra torreyana, Ephedra viridis, Ericameria nauseosa, and Gutierrezia 

sarothrae. 



Globally. Limited quantitative documentation exists for this type, outside of plots taken at 

Capitol Reef National Park, near the northern end of the association’s range. 

Petrified Forest National Park. The four relevés grouped into this association were characterized 

by Bouteloua eriopoda in the herbaceous stratum. In relevés with low total vegetation 

cover, the cover of Bouteloua eriopoda was also proportionally low. Pleuraphis jamesii was 

entirely absent in one relevé; therefore the classification of this relevé may need to be reconsidered. 




Physiognomic group V.A.5. Temperate.or.subpolar.grassland 

Physiognomic subgroup V.A.5.N. Natural/Semi-natural.temperate.or.subpolar.grassland 

Formation name V.A.5.N.e. Short.sod.temperate.or.subpolar.grassland 

Alliance name 

Bouteloua eriopoda.Herbaceous.Alliance.(A.1284),.Black. 

Grama.Herbaceous.Alliance 



CES304.787 


Inter-Mountain.Basins.Semi-Desert.Grassland 


Global rank. G3 (14-Nov-2005). This transitional Colorado Plateau-Chihuahuan Desert 

grassland has had its range significantly reduced by the impacts of livestock grazing over the 

last 150 years, particularly during years of extreme drought. Few examples remain that have 

not been significantly impacted by grazing and altered fire regimes. Overall, high-quality occurrences 

are not likely to exceed 50 in number. Inventory of potential occurrences in both the 

C67


Chihuahuan Desert and Colorado Plateau ecoregions is needed. The range of this association 

is not likely to extend much further north than southern Utah, as Bouteloua eriopoda is known 

only from the Colorado River drainage (including the Virgin River) south of Moab. 

Distribution: 

Globally. This Colorado Plateau association is known from the upper Rio Puerco watershed 

in northwestern New Mexico, Wupatki National Monument and Petrified Forest National 

Park in north-central Arizona, and scattered small sites at Capitol Reef National Park in southeastern 

Utah. It extends south to the Sevilleta National Wildlife Refuge in central New Mexico 

in the transition zone with the northern Chihuahuan Desert. 

Petrified Forest National Park. Bouteloua eriopoda - Pleuraphis jamesii Herbaceous Vegetation 

was identified from four relevés in Petrified Forest National Park. These relevés occurred 

on the lower and midslopes of hills and on sandsheets and sand dunes. This association was 

identified in the central neck section of the park, specifically located east of the park road and 

north of the unpaved maintenance road, and east of the park road north of the Puerco River 

and south of the Borrow Pit road. 


Globally. This Colorado Plateau desert grassland has been documented from the upper Rio 

Puerco watershed in northwestern New Mexico, in north-central Arizona, and from a single 

station in southeastern Utah. Elevations range from 1455-1830 m (4770-6000 ft) at the southern 

end of the range and at 1275 m on a south-facing slope in Utah. Stands occur on flat to 

gently sloping plains, basin floors, or steeply sloping mesa sides. Substrates are variable and include 

weakly developed Entisols and Entisol-Mollisol complexes often with loam to clay-loam 

soils derived from basalt outcrop, shale, clay and sandstone, and coarser textured soils derived 

from black cinders and sandstone. 

Petrified Forest National Park. This association’s elevation ranged from 1660 to 1690 m 

(5540-5550 ft). It occurred on low slopes ranging from 3 to 4% (average 4%). One of the relevés 

was surrounded by small washes. 



Globally. This association is characterized by Bouteloua eriopoda and Pleuraphis jamesii (= 

Hilaria jamesii) codominating an open to moderately dense perennial graminoid layer. Associates 

include low cover of Aristida purpurea, Bouteloua gracilis, Hesperostipa neomexicana 

(= Stipa neomexicana), Muhlenbergia porteri, Sporobolus airoides, Sporobolus cryptandrus, 

and Sporobolus flexuosus. Forb cover and diversity are low. Scattered shrubs and dwarf-shrub 

may be present, including Atriplex canescens, Ephedra torreyana, Ephedra viridis, Ericameria 

nauseosa, and Gutierrezia sarothrae (Francis 1986). The presence of Bouteloua eriopoda and 

Muhlenbergia porteri, and its occurrence at Sevilleta National Wildlife Refuge, suggests that 

this grassland is transitional to Chihuahuan Desert grasslands that begin over 100 miles to the 

south. 

Petrified Forest National Park. The relevés classified as Bouteloua eriopoda - Pleuraphis 

jamesii Herbaceous Vegetation had total vegetation covers ranging from 15 to 30%. This vegetation 

cover consisted of a moderate shrub layer ranging from 5 to 22% cover (average 12%) 

and a significant herbaceous stratum ranging from 8 to 17% cover (average 13%). The species 

diversity for this association varied between 32 and 38 species (average 35 species). The 

vegetation was mainly dominated by herbaceous species and was typically characterized by 

the dominance or codominance of Bouteloua eriopoda and Pleuraphis jamesii. Bouteloua eriopoda’s 

cover ranged from 1 to 10% (average 6%) and Pleuraphis jamesii had a 0 to 4% cover 

(average 1%). The shrub layer had a low cover of Gutierrezia sarothrae in all relevés, ranging 

from 0.5 to 2% (average 1%). 

C68



Stratum 

Short.shrub/ 

sapling 

Herb.(field) 


Atriplex obovata 

Pleuraphis jamesii 

PEFO species 

Atriplex obovata 

Bouteloua eriopoda, Pleuraphis 

jamesii 




PEFO species 


References: 

Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Driscoll et al. 1984, Francis 1986, Hansen 

et al. 2004b, Muldavin et al. 1998d, Western Ecology Working Group n.d. 

C69



C.4.3. Bouteloua gracilis - Pleuraphis jamesii Herbaceous Vegetation 




Blue.Grama.-.Galleta.Herbaceous.Vegetation 

Blue.Grama.-.James’.Galleta.Herbaceous.Vegetation 

CEGL001759 

Summary: 

These grasslands occur on alluvial flats, mesas, and plains in the semi-arid southwestern Great Plains 

and the Colorado Plateau in southeastern Colorado, New Mexico, northern Arizona and southern 

Utah. Elevation ranges from 1625-1890 m (5330-5654 ft) on the Colorado Plateau and extends 

below 1525 m (5000 ft) in the southwestern Great Plains. Sites are flat to undulating, with shallow to 

moderately deep, loam to silty clay loam-textured soil. Stands are codominated by the graminoids 

Bouteloua gracilis and Pleuraphis jamesii (= Hilaria jamesii). These short and medium-tall perennial 

bunch grasses may form a sod-like ground cover with patches of bare ground, especially where grazing 

by livestock encourages a prostrate growth form. Canopy cover is relatively sparse to moderately 

dense (20-80% cover). Other grasses include Buchloe dactyloides, Muhlenbergia torreyi, Sporobolus 

cryptandrus, Aristida spp., Achnatherum hymenoides (= Oryzopsis hymenoides), Pascopyrum smithii, 

Hesperostipa comata (= Stipa comata), or Hesperostipa neomexicana (= Stipa neomexicana). Forb cover 

is generally sparse but may be diverse. Characteristic species include Sphaeralcea coccinea, Grindelia 

squarrosa, Cryptantha spp., Machaeranthera pinnatifida, Ratibida spp., and Zinnia grandiflora. Scattered 

dwarf-shrubs, shrubs, and cacti, such as Gutierrezia sarothrae, Artemisia bigelovii, Artemisia 

frigida, Krascheninnikovia lanata, Prosopis glandulosa, Yucca glauca, Opuntia imbricata, and Opuntia 

polyacantha, are not uncommon. Codominance of Bouteloua gracilis and Pleuraphis jamesii distinguishes 

this vegetation from several closely related grasslands. 



Globally. More classification and survey work are needed to distinguish this type from closely 

related grasslands over its relatively broad geographic range, and to inventory its extent and 

condition. 

Petrified Forest National Park. This association tends to have low total vegetation cover 

and correspondingly low total herbaceous cover. Bouteloua gracilis consistently occurred in 

every relevé but with low cover (



Global rank. G3 (14-Nov-2005). G2G4 (15-Oct-1999). Historically, most sites supporting this 

association have been converted to dryland or to irrigated cropland in the plains. Overgrazing 

by livestock has changed some of these grasslands to sparse desert grasslands or desert 

scrubland. In addition, the reduction of fire frequency, either by livestock grazing the fine 

fuels that carry fires or by active suppression, has allowed the invasion of trees and shrubs. 

Loss to urban development has been significant in recent decades. Urban development and 

transformation to pinyon/juniper woodlands or desert grassland/scrubland are continuing the 

negative trend. More classification and survey work are needed to distinguish this type from 

closely related grasslands over its relatively broad geographic range and to inventory its extent 

and condition. 

Distribution: 

Globally. These grasslands are found in the southern shortgrass steppe of southeastern Colorado 

and eastern New Mexico, and alluvial flats and mesas of the Colorado Plateau in New 

Mexico and Utah, south to Sevilleta National Wildlife Refuge in central New Mexico. 

Petrified Forest National Park. Bouteloua gracilis - Pleuraphis jamesii Herbaceous Vegetation 

was identified from three relevés within Petrified Forest National Park. Sites occurred on 

a plateau and on sand dunes/sandsheets in the central neck section of the park, south of Blue 

Mesa along the main park road and Dry Wash, and northwest of Jim Camp Wash and the Giant 

Logs. 


Globally. These grasslands occur on alluvial flats, mesas, and plains in the semi-arid southwestern 

Great Plains and the Colorado Plateau in southeastern Colorado, New Mexico, 

northern Arizona and southern Utah. Elevation ranges from 1625-1890 m (5330-5654 ft) on 

the Colorado Plateau and extends below 1525 m (5000 ft) in the southwestern Great Plains. 

Sites are flat to undulating, with shallow to moderately deep, loam to silty clay loam-textured 

soil. 

Petrified Forest National Park. The association occurred between the elevations of 1664 and 

1725 m (5459-5654 ft), with zero to moderate slope (0-16%, average 6%). Only one stand had 

any surface rocks, including desert pavement and petrified wood. 



Globally. This association is characterized by an open to moderately dense (20-80% cover) 

herbaceous layer that is codominated by the graminoids Bouteloua gracilis and Pleuraphis 

jamesii (= Hilaria jamesii). These short and medium-tall perennial bunch grasses may form 

a sod-like ground cover with patches of bare ground, especially where grazing by livestock 

encourages a prostrate growth form. Other grasses include Buchloe dactyloides, Muhlenbergia 

torreyi, Sporobolus cryptandrus, Aristida spp., Achnatherum hymenoides (= Oryzopsis hymenoides), 

Pascopyrum smithii, Hesperostipa comata (= Stipa comata), or Hesperostipa neomexicana 

(= Stipa neomexicana). Forb cover is generally sparse but may be diverse. Characteristic species 

include Sphaeralcea coccinea, Grindelia squarrosa, Cryptantha spp., Machaeranthera pinnatifida, 

Ratibida spp., and Zinnia grandiflora. Scattered dwarf-shrubs, shrubs, and cacti, such 

as Gutierrezia sarothrae, Artemisia bigelovii, Artemisia frigida, Krascheninnikovia lanata, Prosopis 

glandulosa (southern stands), Yucca glauca, Opuntia imbricata, and Opuntia polyacantha, 

are not uncommon. Codominance of Bouteloua gracilis and Pleuraphis jamesii distinguishes 

this vegetation from several closely related grasslands. 

C71


Petrified Forest National Park. Three relevés were classified as Bouteloua gracilis - Pleuraphis 

jamesii Herbaceous Vegetation, with total vegetation cover varying between 10 and 24% 

(average 16%). The vegetation cover consisted of low cover in the shrub stratum of 2-3% 

(average 3%) and a moderate herbaceous stratum of 8-21% cover (average 14%). The species 

diversity for this association ranged from 18 to 27 species (average 23 species). The vegetation 

was codominated by Bouteloua gracilis, ranging from 1 to 3% cover (average 2%), and Pleuraphis 

jamesii, ranging from 2 to 15% cover (average 8%). In one stand, the annual forb Plantago 

patagonica had 5% cover. 


Stratum 

Herb.(field) 


Bouteloua gracilis, Pleuraphis jamesii 

PEFO species 

Bouteloua gracilis, Pleuraphis jamesii 




PEFO species 


References: 

Beavis et al. 1982, Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Dick-Peddie 1993, 

Driscoll et al. 1984, Francis 1986, Johnston 1987, Muldavin et al. 1998d, Rogers 1953, Shaw et al. 1989, 

Soil Conservation Service 1978, Terwilliger et al. 1979a, Van Pelt 1978, Western Ecology Working 

Group n.d. 

C72



C.4.4. Bouteloua gracilis Herbaceous Vegetation 

Base map class 

NatureServe common name 

NatureServe code 

Blue.Grama.Herbaceous.Vegetation 

Blue.Grama.Herbaceous.Vegetation,.Blue.Grama.Shortgrass. 

Prairie 

CEGL001760 

Summary: 

This minor plant association is reported from Arizona, Colorado, New Mexico, Utah, and Wyoming. 

Sites are flat to gently sloping and include plains, plateaus, and montane meadows. Substrates are 

variable and range from coarse-textured soils derived from sand, gravel, granite or cinder to silty clay 

loam prairie soils. The vegetation is characterized by a moderate to dense (25-80% cover) herbaceous 

layer that is strongly dominated by the warm-season, perennial shortgrass Bouteloua gracilis. 

Associated grasses are Bouteloua curtipendula, Elymus elymoides, Muhlenbergia spp., Pascopyrum 

smithii, Pleuraphis jamesii (= Hilaria jamesii), Sporobolus cryptandrus, and the introduced annual grass 

Bromus tectorum. Forb cover is sparse. Scattered Ericameria nauseosa shrubs and an occasional Pinus 

edulis, Juniperus spp., or Pinus ponderosa tree (in montane stands) may be present. 



Globally. This is a low-confidence association. There are many other associations in the 

Bouteloua gracilis Herbaceous Alliance (A.1282). This association often represents degraded 

montane grasslands and Bouteloua gracilis-dominated grasslands that lack other diagnostic 

species. Bouteloua gracilis is often able to persist after other species are eliminated because it is 

an extremely drought- and grazing-tolerant species. 

Petrified Forest National Park. Bouteloua gracilis, the defining nominal species, has a wide 

cover range and does not have to dominate the herbaceous cover for relevés to be classified as 

this association. However, Bouteloua gracilis is considered the most diagnostic species in the 

herbaceous layer and was used to aggregate these relevés into one association classification. 






Formation name V.A.5.N.e. Short.sod.temperate.or.subpolar.grassland 

Alliance name 

Bouteloua gracilis.Herbaceous.Alliance.(A.1282),.Blue. 

Grama.Herbaceous.Alliance 



CES304.787 




Global rank. G4Q (23-Feb-1994). 

C73


Distribution: 

Globally. This minor plant association occurs in Arizona, Colorado, New Mexico, Utah, and 

Wyoming. 

Petrified Forest National Park. Bouteloua gracilis Herbaceous Vegetation was identified 

from nine relevés located in Petrified Forest National Park and its environs on upper, mid, 

and lower slopes, as well as on sand dunes/sandsheets and talus slopes. The association was 

located outside the park on private land northwest of Pilot Rock, north of Old Route 66 in the 

northern wilderness area and southwest of Alley Way Tank, north of Interstate 40 and east of 

the northern headquarters offces, near and southwest of Agate House Ruins, on the streambank 

of Cottonwood Wash, south of Cottonwood Wash and south of old Highway 180, east of 

the park road in the East Fork Wash, and west of Rainbow Forest. 


Globally. This minor plant association is reported from Arizona, Colorado, New Mexico, 

Utah and Wyoming. Elevation ranges from 1660-2705 m (5420-8875 ft). Sites are flat to moderately 

sloping and include plains, plateaus, and montane meadows and parks. Substrates are 

variable and range from coarse-textured soils derived from sand, gravel, granite or cinder to 

silty clay loam prairie soils. Montane Bouteloua gracilis-dominated grasslands included in this 

association are typically the result of heavy grazing by wildlife and/or livestock that select out 

less grazing-tolerant mid grasses. 


57670 ft) elevation. Slopes ranged from low to steep (1to 38%, average 10%). Over a third of 

the relevés had some surface rocks of rounded gravel and petrified wood. 



Globally. This association is characterized by a moderate to dense (10-80% cover) herbaceous 

layer that is strongly dominated by the warm-season, perennial shortgrass Bouteloua 

gracilis. Associated grasses are Achnatherum hymenoides, Bouteloua curtipendula, Elymus 

elymoides, Koeleria macrantha, Muhlenbergia montana, Muhlenbergia richardsonis, Muhlenbergia 

torreyi, Pascopyrum smithii, Pleuraphis jamesii (= Hilaria jamesii), Sporobolus cryptandrus, 

and the introduced annual grass Bromus tectorum. Forb cover is sparse. Associated forbs 

include Artemisia carruthii, Artemisia dracunculus, Eriogonum spp., and Sphaeralcea coccinea. 

Scattered Ericameria nauseosa shrubs and an occasional Juniperus spp., Pinus edulis, or Pinus 

ponderosa tree (in montane stands) may be present. 

Petrified Forest National Park. Nine relevés were classified as Bouteloua gracilis Herbaceous 

Vegetation, with total vegetation cover ranging from 12 to 29% (average 20%). The vegetation 

cover consisted of a shrub stratum with 1-11% cover (average 4%) and an herbaceous stratum 

with 9-22% cover (average 16%). The species diversity for this association ranged from 13 to 

39 species (average 26 species). The herbaceous layer was either dominated by or had a significant 

proportion of cover from Bouteloua gracilis, ranging from 2 to 13% cover (average 8%). 

Phacelia crenulata, an annual species, had significant cover (5%) in two relevés. The shrub 

Chrysothamnus greenei had fairly significant cover of 4 and 5% in two relevés. 



Herb.(field) Bouteloua gracilis Bouteloua gracilis 

C74





PEFO species 


References: 

Bourgeron and Engelking 1994, Bradley et al. 1992, CONHP unpubl. data 2003, Driscoll et al. 1984, 

Dwyer and Pieper 1967, Fisser 1970, Fisser et al. 1965, Hansen et al. 2004a, Hansen et al. 2004c, Muldavin 

et al. 2000b, Pieper 1968, Western Ecology Working Group n.d., Williams 1961, Zimmerman 

1967 

C75



C.4.5. Calamovilfa gigantea Desert Wash Shrub Herbaceous Vegetation 




Giant.Sandreed.Desert.Wash.Shrub.Herbaceous.Vegetation 

Big.Sandreed.Desert.Wash.Shrub.Herbaceous.Vegetation 

CEGL004012 

Summary: 

This vegetated wash association occurs at Petrified Forest National Park in northern Arizona and 

likely occurs elsewhere in the southern Colorado Plateau. Elevations at the national park range from 

1650 to 1680 m (5400-5500 ft). Stands occur in or near gently sloping washes that experience periodic 

streamflow. The substrate is mixed alluvium, sometimes with a surface layer of rocks derived from 

sandstone, petrified wood, and mixed gravel. The vegetation cover is characterized by a relatively diverse 

(21 to 42 species) and open canopy that ranges from 17 to 23% total cover. The vegetation cover 

is composed of an open herbaceaous layer (9-14% cover) dominated by the tall graminoid, Calamovilfa 

gigantea (5-9% cover). Scattered shrubs such as Ericameria nauseosa (2-3% cover) are present, 

with total shrub cover of 6-9%. 




Petrified Forest National Park. This association had a similar composition and environment 

as Ericameria nauseosa Desert Wash Shrubland (CEGL002261), except that it had a higher 

cover of the grass Calamovilfa gigantea. 






Formation name V.A.5.N.a. Tall.sod.temperate.or.subpolar.grassland 

Alliance name 

Calamovilfa gigantea.Herbaceous.Alliance.(A.2680),.Big. 

Sandreed.Herbaceous.Alliance 



CES304.781 




Global rank. GNR (14-Feb-2007) 

Distribution: 

Globally. This association has only been described from Petrified Forest National Park in 

northeastern Arizona and likely occurs elsewhere in the Painted Desert of the southern Colorado 

Plateau. Until further inventory is completed, there is no global information. 

C76


Petrified Forest National Park. Calamovilfa gigantea Desert Wash Shrub Herbaceous Vegetation 

was identified from three relevés in Petrified Forest National Park. All of these relevés 

occurred in or near washes that experience periodic streamflow. Stands were sampled west of 

Dry Wash and north of Jasper Forest, north of Cottonwood Wash and south of Agate House 

Ruins, and south of Agate Bridge and west of the main park road. 





and 1680 m (5400-5500 ft). The slope of every relevé was minimal (1%). In two relevés, surface 

rocks were present and consisted of sandstone, petrified wood, and mixed gravel. 





Petrified Forest National Park. Three relevés were classified as Calamovilfa gigantea Desert 

Wash Shrub Herbaceous Vegetation, with total vegetation cover between 17 and 23% (average 

20%). This vegetation cover consisted of a shrub stratum varying between 6 and 9% (average 

8%) and an herbaceous stratum varying between 9 and 14% (average 12%). The species diversity 

for this association varied between 21 and 42 species (average 32 species). The herbaceous 

layer was dominated by Calamovilfa gigantea with 5-9% cover (average 7%) and the shrub 

layer was dominated by Ericameria nauseosa with 2-3% cover (average 3%). 



Herb.(field) N/A Calamovilfa gigantea 




PEFO species 


References: 


C77



C.4.6. Ericameria nauseosa / Bouteloua gracilis Shrub Herbaceous Vegetation 




Rubber.Rabbitbrush./.Blue.Grama.Shrub.Herbaceous. 


Rubber.Rabbitbrush./.Blue.Grama.Shrub.Herbaceous. 


CEGL003495 

Summary: 

This shrub herbaceous association occurs on valley floors, swales, and alluvial flats in the southern 

and central part of the Colorado Plateau. Its presence generally indicates disturbance, and it may 

represent degraded forms of other grassland, shrubland, or woodland communities. Stands occupy 

gentle to moderate slopes (2-13%) between 1635 and 2010 m (5360-6600 ft) elevation. Aspect 

does not affect the distribution of this association. Litter and bare soil cover most of the unvegetated 

surface. Parent materials are variable and include sandstones and shale that have eroded and been redeposited 

as alluvium or windblown sediments (loess). Soils are well-drained and fine-sandy or silty 

in texture. Total vegetation cover ranges from 10 to 65%, roughly equally divided between the shrub 

and herbaceous layers. The vegetation is characterized by an open short-shrub canopy of Ericameria 

nauseosa that ranges in cover from 5 to 25% and an understory dominated by Bouteloua gracilis that 

ranges in cover from 5 to 35%. Other shrubs may be present with very low cover, including Tetradymia 

canescens, Atriplex spp., Gutierrezia sarothrae, and Opuntia polyacantha. Associated graminoids 

present include the bunch grasses Achnatherum hymenoides, Aristida purpurea, Pascopyrum smithii, 

Pleuraphis jamesii, Sporobolus airoides, Sporobolus cryptandrus, and Muhlenbergia pungens. Only scattered 

forbs are present. 



Globally. Former CEGL001738 and CEGL001739 were lumped into this new association; 

separation of these two types by subspecies of Ericameria nauseosa was not supported by the 

data in Francis (1986). 

Petrified Forest National Park. This map class was distinguished from Ericameria nauseosa 

Desert Wash Shrubland (CEGL002261) by its restriction to upland areas. This association also 

tended to have a proportionally higher herbaceous cover, as well as no codominance by other 

shrub species. 




Physiognomic group V.A.7. Temperate.or.subpolar.grassland.with.a.sparse.shrub. 

layer 


with.a.sparse.shrub.layer 

Formation name V.A.7.N.j. Short.temperate.or.subpolar.grassland.with.a.sparse. 

microphyllous.evergreen.shrub.layer 

Alliance name 

Ericameria nauseosa.Shrub.Short.Herbaceous.Alliance. 

(A.1546),.Rubber.Rabbitbrush.Shrub.Short.Herbaceous. 

Alliance 

C78




CES304.775 

CES304.765 

CES304.788 






Distribution: 

Global rank. GNR (14-Apr-2003). 

Globally. This association has been documented from widely scattered sites in southern 

Utah, northern Arizona, from the upper Rio Puerco watershed in northern New Mexico 

(Francis 1986), Petrified Forest National Park in northeastern Arizona, and is likely to occur 

across the central part of the Colorado Plateau. 

Petrified Forest National Park. Ericameria nauseosa / Bouteloua gracilis Shrub Herbaceous 

Vegetation was identified from two relevés on sand dunes/sandsheets and on a talus surface 

within Petrified Forest National Park. They were located south of Newspaper Rock and south 

of The Haystacks. 


Globally. This shrub herbaceous association occurs on valley floors, swales and alluvial flats 

in the central part of the Colorado Plateau. Stands occupy gentle to moderate slopes (2-13%) 

between 1635 and 2010 m (5360-6600 ft) elevation. Aspect does not control the distribution 

of this association. Litter and bare soil cover most of the unvegetated surface. Parent materials 

are variable and include sandstones and shale that have eroded and been re-deposited as 

alluvium or windblown sediments. Soils are well-drained and fine-sandy or silty in texture. 


elevation. Slopes were minimal (2-4%). 



Globally. The total vegetation cover ranges from 10 to 65%, roughly equally divided between 

the shrub and herbaceous layers. The vegetation is characterized by a short-shrub canopy 

of Ericameria nauseosa that ranges in cover from 5 to 25% and an understory dominated by 

Bouteloua gracilis that ranges in cover from 5 to 35%. Other shrubs may be present with very 

low cover, including Tetradymia canescens, Atriplex canescens, Atriplex confertifolia, Gutierrezia 

sarothrae, and Opuntia polyacantha. Associated graminoids present include the bunch 

grasses Achnatherum hymenoides, Aristida purpurea, Pascopyrum smithii, Sporobolus airoides, 

Sporobolus cryptandrus, and Muhlenbergia pungens. Only scattered forbs are present, such as 

Chaetopappa ericoides, Ipomopsis longiflora, and Senecio spartioides. 

Petrified Forest National Park. The two relevés classified as Ericameria nauseosa / Bouteloua 

gracilis Shrub Herbaceous Vegetation had total vegetation cover of 23 and 24%. This vegetation 

cover was composed of 8 and 9% cover in the shrub stratum and 14 and 16% cover in the 

herbaceous stratum. The species diversity was 35 and 36 species. The shrub layer was dominated 

by Ericameria nauseosa with low shrub cover of 1 and 3%; the herbaceous layer was 

dominated by Bouteloua gracilis with 1 and 5% cover. 

C79




Short.shrub/ Ericameria nauseosa Ericameria nauseosa 

sapling 

Herb.(field) Bouteloua gracilis Bouteloua gracilis 




PEFO species 


References: 

Francis 1986, Hansen et al. 2004a, Western Ecology Working Group n.d. 

C80



C.4.7. Opuntia whipplei - Sporobolus airoides Shrub Herbaceous Vegetation [Park Special] 




Whipple.Cholla.-.Alkali.Sacaton.Shrub.Herbaceous.Vegetation 

Rattail.Cholla.-.Alkali.Sacaton.Shrub.Herbaceous.Vegetation. 

[Park.Special] 

Park.Special 

Summary: 

This Opuntia whipplei dominated sand deposit association has only been described from Petrified 

Forest National Park. Until further inventory is completed, there is no global information. 




Petrified Forest National Park. This vegetation community was only sampled from one 

location. Since this community is unique to the NVCS and has yet to be sampled with enough 

frequency during this project or at other locations, we were not able to assign it a NVCS association 

status. Until additional data are collected, this vegetation will be retained as a unique 

local assemblage or a park special vegetation type. 







Alliance name 

N/A 



CES304.775 





Distribution: 



Petrified Forest National Park. Opuntia whipplei - Sporobolus airoides Shrub Herbaceous 

Vegetation (Park Special) was sampled from one relevé. It occurred on a sand dune/sandsheet 

located west of the Rainbow Forest in Petrified Forest National Park. 




C81


Petrified Forest National Park. This vegetation community was sampled at an elevation of 

1696 m (5564 ft) on a flat surface. The surface rocks contained a trace of petrified wood. 





Petrified Forest National Park. Only one relevé was classified as Opuntia whipplei - Sporobolus 

airoides Shrub Herbaceous Vegetation (Park Special), with total vegetation cover of 

13%. This vegetation cover consisted of 4% cover in the shrub stratum and 9% cover in the 

herbaceous stratum. The species diversity of this stand was 13 species. In the shrub layer, the 

vegetation was dominated by Opuntia whipplei with 3% cover, and in the herbaceous layer, it 

was dominated by Sporobolus airoides with 4% cover. 



Short.shrub/ N/A Opuntia whipplei 

sapling 




N/A 

PEFO species 


References: 


C82



C.4.8. Pleuraphis jamesii - Sporobolus airoides Herbaceous Vegetation 




Galleta.–.Alkali.Sacaton.Herbaceous.Vegetation 

James’.Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation 

CEGL001778 

Summary: 

This once-extensive grassland of the northern Chihuahuan Desert, Colorado Plateau, and Great 

Basin has been described in New Mexico from White Sands Missile Range and the upper Rio Puerco 

watershed, as well as in north-central Arizona and southeastern Utah. It has, however, experienced 

significant declines throughout its range. It primarily occurs in swales within open valley bottoms 

and alluvial flats, although sandsheets and dunes also can support the association. Sites are on level 

to gentle slopes (




CES304.787 




Global rank. G2G3 (14-Nov-2005). This once-extensive grassland of the Great Basin and 

Chihuahuan Desert ecoregions has been described in New Mexico from the Upper Rio 

Puerco watershed and White Sands Missile Range, as well as isolated areas in north-central 

Arizona and southeastern Utah. It has experienced significant declines throughout its range. 

Remaining examples that have not been negatively impacted by grazing and/or invaded by 

shrubs are rare. However, this grassland is probably more widespread than is documented and 

hence the rank of G2G3. 

Distribution: 

Globally. This once-extensive grassland of the northern Chihuahuan Desert, Colorado 

Plateau, and Great Basin is reported in New Mexico from White Sands Missile Range and the 

upper Rio Puerco watershed. More recently, it has been documented in north-central Arizona 

and southeastern Utah. It has experienced significant declines throughout its range. 

Petrified Forest National Park. Pleuraphis jamesii - Sporobolus airoides Herbaceous Vegetation 

was identified from three relevés within Petrified Forest National Park and from one 

relevé south of Dry Wash Tanks on Arizona State Land. This association occurred on various 

landforms, including sideslopes, lower slopes, plateaus, and sand dunes/sandsheets. These 

stands were identified from these three locations: near the park road and north of Dry Wash; 

in the central neck area of the park and east of the park road; and west of Blue Mesa and south 

of Dry Wash Tanks. 


Globally. This grassland association is described in New Mexico from White Sands Missile 

Range and the upper Rio Puerco watershed, as well as in north-central Arizona and southeastern 

Utah. It primarily occurs in swales within open valley bottoms and alluvial flats, although 

sandsheets and dunes also can support the association. Sites are on level to gentle slopes 

(


herbaceous species, such as Achnatherum hymenoides, Chaenactis stevioides, Cryptantha sp., 

Cymopterus newberryi, Bouteloua gracilis, Ipomopsis gunnisonii (= Gilia gunnisonii), Lappula 

occidentalis, Muhlenbergia porteri, Muhlenbergia pungens, Muhlenbergia torreyi, Pascopyrum 

smithii, Plantago patagonica, Scleropogon brevifolius, Sphaeralcea coccinea, and Sporobolus 

cryptandrus, may be present with low cover (Francis 1986, Muldavin et al. 2000b). Biological 

soil crusts may be extensive in undisturbed examples of this association. 

Petrified Forest National Park. Four relevés were classified as Pleuraphis jamesii - Sporobolus 

airoides Herbaceous Vegetation. The total vegetation cover of these stands ranged from 13 to 

18% (average 15%) and consisted of a shrub stratum with 1 to 6% cover (average 3%) and an 

herbaceous stratum with 10-15% cover (average 12%). The species diversity ranged from 17 

to 33 species (average 25 species). The vegetation was codominated in the herbaceous layer 

by Pleuraphis jamesii with 2-4% cover (average 3%) and Sporobolus airoides with 2-8% cover 

(average 4%). 



Herb.(field) Pleuraphis jamesii, Sporobolus Pleuraphis jamesii, Sporobolus 

airoides 

airoides 




PEFO species 


References: 

Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Driscoll et al. 1984, Francis 1986, Hansen 

et al. 2004b, Muldavin et al. 1998b, Muldavin et al. 2000b, West et al. 1972, Western Ecology Working 

Group n.d. 

C85



C.4.9. Salsola tragus Sand Dune Vegetation [Park Special] 




Russian.Thistle.Sand.Dune.Vegetation 

Prickly.Russian-thistle.Sand.Dune.Vegetation.[Park.Special] 

Park.Special 

Summary: 

This Salsola tragus dominated sand deposit association has only been described from Petrified Forest 

National Park. Until further inventory is completed, there is no global information. 




Petrified Forest National Park. This vegetation was designated as a Park Special vegetation 

community and has not yet been assigned NVCS association status. This is due to the lack of 

data collected, as well as the dominant species in this association being an annual non-native 

herbaceous forb. The dominance of Salsola tragus in these communities varies seasonally and 

annually. Although this species is an annual species and may vary significantly in cover, Salsola 

tragus is the dominant species on these relevés and no other species has significant cover or is 

a good indicator for these sand dune communities. 







Alliance name 

N/A 



CES304.775 





Distribution: 



Petrified Forest National Park. Salsola tragus Sand Dune Vegetation (Park Special) occurred 

on two relevés within Petrified Forest National Park. This community type was identified 

on talus/sand dune landforms. These two relevés were sampled west of the main park road, 

northeast of Jasper Forest and west of the Lithodendron Wash and Pintado Point in the northern 

wilderness area. 

C86





Petrified Forest National Park. This vegetation community occurred at about 1660 m (5430- 

5460 ft) elevation. Slope was none to low (0-5.3%). 





Petrified Forest National Park. Two relevés were classified as Salsola tragus Sand Dune 

Vegetation (Park Special), with total vegetation cover of 14 and 18%. The vegetation cover 

consisted of 3 and 4% cover in the shrub stratum and 10 and 15% cover in the herbaceous 

stratum. The species diversity was 21 and 30 species. The vegetation in the herbaceous layer 

was dominated by the non-native herbaceous forb Salsola tragus with 4 and 9% cover. No 

other species had significant cover in either the shrub or herbaceous layers. 



Herb.(field) Data are not available. Salsola tragus 




PEFO species 

Achnatherum hymenoides, 

Atriplex obovata, Chamaesyce 

fendleri, Ericameria nauseosa, 

Gutierrezia sarothrae, Isocoma 

drummondii, Pleuraphis jamesii, 

Senecio spartioides, Sporobolus 

airoides, Townsendia annua, Yucca 

angustissima 

References: 


C87



C.4.10. Sporobolus airoides - Bouteloua gracilis Herbaceous Vegetation 




Alkali.Sacaton.–.Blue.Grama.Herbaceous.Vegetation 

Alkali.Sacaton.-.Blue.Grama.Herbaceous.Vegetation 

CEGL001686 

Summary: 

This grassland association occurs in basins in the northern Chihuahuan Desert in south-central New 

Mexico and in the southern Colorado Plateau in northwestern New Mexico and northern Arizona 

at 1570 to 2240 m (5160-7370 ft) elevation. Stands occur on gently sloping (



Distribution: 

Global rank. GNRQ (23-Feb-1994). 

Globally. This grassland association occurs in the northern Jornada del Muerto and Tulerosa 

basins in south-central New Mexico and in the southern Colorado Plateau in the upper 

Rio Puerco watershed in northwestern New Mexico and at Petrified Forest National Park in 

northern Arizona. 

Petrified Forest National Park. Sporobolus airoides - Bouteloua gracilis Herbaceous Vegetation 

was identified from seven relevés within Petrified Forest National Park. This association 

occurred on lower slopes, sand dunes/sandsheets, and terraces. It was located both north 

and west of the Blue Mesa road towards the main park road and was also identified south of 

Newspaper Rock approximately 2 m west of the main park road, west of the southern wilderness 

area, and south of the Crystal Forest and east of the main park road 


Globally. This grassland association occurs in basins in the northern Chihuahuan Desert in 

south-central New Mexico and in the southern Colorado Plateau in northwestern New Mexico 

and northern Arizona at 1570 to 2240 m (5160-7370 ft) elevation. Stands occur on gently 

sloping (




Herb.(field) Bouteloua gracilis, Sporobolus Bouteloua gracilis, Sporobolus 

airoides 

airoides 



Salsola kali ssp. tragus 

PEFO species 


References: 

Bourgeron and Engelking 1994, Driscoll et al. 1984, Francis 1986, Muldavin and Mehlhop 1992, Muldavin 

et al. 2000b, Western Ecology Working Group n.d. 

C90



C.4.11. Sporobolus airoides Southern Plains Herbaceous Vegetation 




Alkali.Sacaton.Herbaceous.Vegetation 

Alkali.Sacaton.Southern.Plains.Herbaceous.Vegetation,.Alkali. 

Sacaton.Southern.Plains.Grassland 

CEGL001685 

Summary: 

This alkali sacaton mesic grassland community is found in the southwestern Great Plains, on the 

Colorado Plateau, in the southwestern United States, and adjacent Mexico. Stands occur on slightly 

to moderately saline, nearly level bottomlands and terraces. Additional moisture from washes and 

sheetflow runoff are important for most stands. Substrates are shallow, moderately well- to poorly 

drained, silty clay soils formed in alluvium. The community is dominated by medium-tall and short 

grasses. Sporobolus airoides is a dominant, often accompanied by Symphyotrichum subulatum (= Aster 

subulatus), Pascopyrum smithii, Buchloe dactyloides, Distichlis spicata, Hordeum jubatum, and Bouteloua 

gracilis. Scattered shrubs, such as Atriplex spp. or Sarcobatus vermiculatus, may be present. Forb 

cover is also minor. 



Globally. Compare this association with Sporobolus airoides - Bouteloua gracilis Herbaceous 

Vegetation (CEGL001686) and Pleuraphis jamesii - Sporobolus airoides Herbaceous Vegetation 

(CEGL001778). Stands in Montana are placed with Sporobolus airoides Northern Plains 

Herbaceous Vegetation (CEGL002274), which occurs in the northwestern Great Plains, and 

this type is restricted to the southwestern Great Plains and southwestern United States. In the 

southeastern Plains see Distichlis spicata - (Hordeum jubatum, Poa arida, Sporobolus airoides) 

Herbaceous Vegetation (CEGL002042). 







Formation name V.A.5.N.d. Medium-tall.bunch.temperate.or.subpolar.grassland 

Alliance name 

Sporobolus airoides.Herbaceous.Alliance.(A.1267),.Alkali. 

Sacaton.Herbaceous.Alliance 



CES304.781 

CES304.775 

CES304.787 





C91



Global rank. G3Q (9-Apr-1998). The number of occurrences is unknown. The community 

is reported from Arizona, Colorado (S3), Kansas, New Mexico (S2), Texas, Utah, and Mexico 

and may occur in California. The community is found on slight to moderately saline, nearly 

level bottomland and terraces with alluvial silty clay soils. 

Distribution: 

Globally. This alkali sacaton mesic grassland community is found in the southwestern Great 

Plains, Colorado Plateau, and elsewhere in the southwestern United States and Mexico, ranging 

from Kansas and Colorado south to Texas, New Mexico and west to Arizona, Utah, and 

possibly California. 

Petrified Forest National Park. Sporobolus airoides Southern Plains Herbaceous Vegetation 

was identified from two relevés within Petrified Forest National Park. They were located 

in a drainage channel and on a sand dune/sandsheet. These two relevés were sampled east 

of Lithodendron Wash and west of Lacey Point and east of Newspaper Rock and east of the 

main park road. 


Globally. This grassland community occurs on alluvial toeslopes and flats, terraces, floodplain 

depressions, and sandy streambanks and washes in bottomlands throughout the southern 

Great Plains and Colorado Plateau. Additional moisture from washes and sheetflow runoff 

are important for most stands. Elevations range from below 1000 m (3050 ft) to over 2000 m 

(6100 ft). Sites are typically flat to gently sloping but may be as steep as 30% slope. Soils are 

shallow to moderately deep, moderately well- to poorly drained, alkaline, and often saline with 

sandy, silty or clay soils (Francis 1986, Johnston 1987, Kittel et al. 1999a, Lauver et al. 1999, 

Von Loh et al. 2002). Other parent materials include lavaflow, cinders, relict Pleistocene river 

cobbles, and sandstone. 

Petrified Forest National Park. This association was sampled at 1640 and 1650 m (5360-5400 

ft) elevation. Both stands had no slope. 



Globally. This association is characterized by a sparse to moderately dense (15-75% cover), 

medium-tall graminoid layer dominated by Sporobolus airoides. Associated species include 

Achnatherum hymenoides, Symphyotrichum subulatum (= Aster subulatus), Buchloe dactyloides, 

Distichlis spicata, Hordeum jubatum, Bouteloua gracilis, Panicum obtusum, Pleuraphis jamesii, 

Sphaeralcea spp., Sporobolus cryptandrus, and Pascopyrum smithii (Francis 1986, Johnston 

1987, Kittel et al. 1999a, Lauver et al. 1999, Von Loh et al. 2002). Scattered shrubs may be 

present, such as Atriplex canescens, Atriplex confertifolia, Ephedra spp., Ericameria nauseosa, 

Gutierrezia sarothrae, or Sarcobatus vermiculatus. Total shrub cover is low (



Stratum 

Herb.(field) 


Sporobolus airoides 

PEFO species 





PEFO species 


References: 

Aldous and Shantz 1924, Bourgeron and Engelking 1994, CONHP unpubl. data 2003, Carsey et al. 

2003a, Driscoll et al. 1984, Francis 1986, Hansen et al. 2004b, Johnston 1987, Kittel and Lederer 1993, 

Kittel et al. 1999b, Lauver et al. 1999, Lindauer 1970, Soil Conservation Service 1978, Steward 1982, 

Von Loh et al. 2002, Western Ecology Working Group n.d. 

C93



C.4.12. Sporobolus coromandelianus Herbaceous Vegetation [Park Special] 




Sporobolus coromandelianus.Herbaceous.Vegetation.(Park. 

Special).was.not.mapped.because.only.one.relevé.was. 

sampled.of.this.unique.community.type..This.vegetation. 

community.could.not.be.identified.on.the.aerial.photography;. 

therefore.the.single.relevé.was.included.in.the.New.Mexico. 

Saltbush./.Galleta.-.Alkali.Sacaton.Shrub.Herbaceous. 

Vegetation.map.class.. 

Target.Dropseed.Herbaceous.Vegetation.[Park.Special] 

Park.Special 

Summary: 





Petrified Forest National Park. This vegetation was only sampled from one location. Sporobolus 

coromandelianus can be either an annual or a perennial species and does not commonly 

occur at Petrified Forest National Park. This vegetation has not been seen elsewhere 

and has not received NVCS association status. If this community is sampled in other locations 

and additional data are collected, then this community type will be elevated to NVCS association 

status. Since Sporobolus coromandelianus is rare at Petrified Forest National Park, it would 

be useful to relocate this relevé and re-identify this grass to ensure the correct species identification. 

It is unlikely that the cover for this species is as high as recorded for this relevé. 







Alliance name 

N/A 



CES304.775 





Distribution: 



C94


Petrified Forest National Park. Sporobolus coromandelianus Herbaceous Vegetation (Park 

Special) was identified from one relevé within Petrified Forest National Park. This one relevé 

was located on a sand dune/sandsheet east of the main park road and Dry Wash and south of 

Blue Mesa. 




Petrified Forest National Park. This vegetation community occurred at an elevation of 1650 

m (5420 ft) with no slope. 





Petrified Forest National Park. Only one relevé was classified as Sporobolus coromandelianus 

Herbaceous Vegetation (Park Special), with total vegetation cover of 20%. The vegetation 

cover consisted of a shrub stratum with 3% cover and an herbaceous stratum with 17% cover. 

The species diversity for this relevé was 25 species. The vegetation in the herbaceous layer was 

dominated by Sporobolus coromandelianus with 8% cover. 



Herb.(field) Data are not available. Sporobolus coromandelianus 




PEFO species 


References: 


C95



C.4.13. Sporobolus cryptandrus Great Basin Herbaceous Vegetation 




Not.mapped..Sporobolus cryptandrus.Great.Basin.Herbaceous. 

Vegetation.is.known.from.only.one.location.and.was. 

indistinguishable.on.the.aerial.photography..This.one.location. 

was.mapped.with.the.Alkali.Sacaton.Herbaceous.Vegetation. 

map.unit.. 

Sand.Dropseed.Great.Basin.Herbaceous.Vegetation 

CEGL002691 

Summary: 

This plant association is described from the Uinta Basin and Colorado Plateau where it occurs on 

alluvial terraces of major rivers, sandy upper stream terraces along intermittent washes, and on 

sand deposits on mesas and plains. Elevation ranges from 1226 to 1630 m. Soils are loamy sands and 

sandy loams derived from alluvium, eolian deposits, or sandstone residuum. Sites have generally 

been disturbed by flooding, shifting sands, livestock grazing, or human recreation. The vegetation is 

dominated by the warm-season perennial graminoid Sporobolus cryptandrus. Hesperostipa comata (= 

Stipa comata), Pleuraphis jamesii, Sporobolus contractus, Sporobolus giganteus, or Equisetum variegatum 

frequently occur in low abundance. Low cover of native forbs such as Sphaeralcea grossulariifolia 

or Chamaesyce fendleri may be present. The introduced annual grass Bromus tectorum and several 

other exotic species such as Bromus rigidus, Salsola kali, Helianthus annuus, Sisymbrium altissimum, 

or Tribulus terrestris may be present to abundant, especially on disturbed riparian stands. Occasional 

Brickellia spp. or other shrubs may occur, but they are not dense enough to form a shrub layer. 



Globally. The association is broadly defined to include Sporobolus cryptandrus-dominated 

stands from both riparian and sandy upland sites. This plant association is similar to the 

threatened, regionally endemic Sporobolus cryptandrus plant associations from the Columbia 

Basin and lower Snake River that have declined significantly due to loss of habitat from 

hydroelectric dam construction and conversion of land to cultivation. Many of the riparian 

stands in these associations are in poor condition because of past management and invasion of 

introduced species. 

Petrified Forest National Park. Although only one relevé was sampled, this community has 

already been described from other locations and is a previously described vegetation association. 

Therefore, this vegetation was classified as an NVCS association. 






Formation name V.A.5.N.d. Medium-tall.bunch.temperate.or.subpolar.grassland 

Alliance name 

Sporobolus cryptandrus.Herbaceous.Alliance.(A.1252),. 

Sand.Dropseed.Herbaceous.Alliance 

C96




CES304.775 

CES304.787 





Distribution: 

Global rank. GNR (26-Jul-2001). 

Globally. The association is found on terraces of large rivers in the Colorado Plateau and 

Uinta Basin and likely occurs elsewhere in the southwestern U.S. 

Petrified Forest National Park. Sporobolus cryptandrus Great Basin Herbaceous Vegetation 

was sampled from just one relevé. It occurred on a sand dune/sandsheet located just east of 

the NPS boundary in the central neck of Petrified Forest National Park, south of the railroad 

tracks and north of the Puerco River. 


Globally. This grassland is described from the Uinta Basin and Colorado Plateau where it 

occurs on alluvial terraces of large rivers, sandy upper stream terraces along intermittent 

washes, and on sand deposits on mesas and plains. Elevation ranges from 1226-1630 m. Sites 

are flat to gently sloping valley bottoms, plains or plateaus. Soils are loamy sands and sandy 

loams derived from alluvium, eolian deposits, or sandstone residuum. Biological soil crusts are 

generally present and may provide up to 30% cover. Stands have generally been disturbed by 

flooding, shifting sands, livestock grazing, or human recreation. 

Petrified Forest National Park. This association occurred at an elevation of 1630 m (5350 ft) 

with no slope. 



Globally. This plant association is found on alluvial terraces of large rivers and on sand 

deposits on mesas and plains. The sparse to moderately dense (10-30% cover) herbaceous 

layer is characterized by the dominance of the warm-season perennial graminoid Sporobolus 

cryptandrus. Hesperostipa comata (= Stipa comata), Pleuraphis jamesii, Sporobolus contractus, 

Sporobolus giganteus, or Equisetum variegatum may occur in low abundance. Low cover of 

native forbs, such as Abronia fragrans, Chamaesyce fendleri, Plantago patagonica, Sphaeralcea 

grossulariifolia, Sphaeralcea parvifolia, or the succulent Opuntia polyacantha may be present. 

The widespread introduced annual grass Bromus tectorum and several other exotic species 

such as Bromus rigidus, Salsola kali, Helianthus annuus, Sisymbrium altissimum, or Tribulus 

terrestris may be present to abundant, especially on disturbed riparian stands. An occasional 

Brickellia spp. or other shrubs may occur, but they are not dense enough to form a shrub layer. 

Moss is important in some stands. 

Petrified Forest National Park. Only one relevé was classified as Sporobolus cryptandrus 

Great Basin Herbaceous Vegetation, with total vegetation cover of 73% consisting of low 

cover of shrubs (3%) and high herbaceous cover (70%). The species diversity was low with 

7 species. The vegetation in the herbaceous layer was almost solely dominated by Sporobolus 

cryptandrus with 70% cover. 

C97




Herb.(field) Sporobolus cryptandrus Sporobolus cryptandrus 




PEFO species 


References: 

Cogan et al. 2004, Cowardin et al. 1979, USFS 1937, Von Loh et al. 2002, Western Ecology Working 

Group n.d. 

C98


C.5 Sparse 

C.5.1. Atriplex obovata Badland Sparse Vegetation 




New.Mexico.Saltbush.Badlands.Sparse.Vegetation 

New.Mexico.Saltbush.Badland.Sparse.Vegetation 

CEGL002928 

Summary: 

This sparsely vegetated badland association occurs in the southern Colorado Plateau in northern 

Arizona between the elevations of 1300 and 1741 m (4265-5712 ft). Sites are flat to gently sloping and 

range between 0 and 9% (average 3%). Substrates are clays derived from shale. Many of the stands 

have some cover of surface rocks, including sandstone, basalt, desert pavement, and petrified wood. 

The vegetation cover is characterized by sparse total vegetation cover (


Distribution: 

Globally. This association is currently known from Arizona. 

Petrified Forest National Park. Atriplex obovata Badland Sparse Vegetation was identified 

from twelve relevés and occurred mostly on plateaus and sand dunes/sandsheets within Petrified 

Forest National Park. A few relevés were located near or in a drainage channel, on a flat 

plain, or in an area with talus. This association ranged the entire extent of the project boundary, 

including the northern wilderness area between Wildhorse Wash and Lithodendron 

Wash, south of Lithodendron Wash and north of Chinde Point, north of Old Route 66 and 

northwest of Alley Way Tank, southwest of Blue Mesa, northeast of The Flattops, east of Dry 

Wash and Agate Bridge, east of The Haystacks, south of Cottonwood Wash, and northwest of 

the Crystal Forest. 


Globally. This sparsely vegetated badland association occurs in the southern Colorado Plateau 

in northern Arizona between the elevations of 1300 and 1741 m (4265-5712 ft). Sites are 

flat to gently sloping and range between 0 and 9% (average 3%). Substrates are clays derived 

from shale. Many of the stands have some cover of surface rocks, including sandstone, basalt, 

desert pavement, and petrified wood (Hansen et al. 2004b). 


and 1741 m (5348-5712 ft) with no or a low slope ranging between 0 and 9% (average 3%). 

Many of the stands have some cover of surface rocks, including sandstone, basalt, desert pavement, 

and petrified wood. 



Globally. The vegetation is characterized by sparse total cover (




Salsola kali ssp. tragus 

PEFO species 


References: 

Hansen et al. 2004b, Western Ecology Working Group n.d. 



PEFO species 


References: 


C101


C.5 Sparse 

C.5.2. Ephedra torreyana - Artemisia bigelovii Sparse Vegetation 




Torrey’s.Jointfir.–.Bigelow’s.Sagebrush.Sparse.Vegetation 

Torrey’s.Joint-fir.-.Bigelow.Sagebrush.Sparse.Vegetation 

CEGL002350 

Summary: 

This Colorado Plateau association has been described from Petrified Forest National Park in northern 

Arizona and Capitol Reef National Park in southeastern Utah, where it is widespread. Stands occur on 

plateaus, mesas, ridges, hills, cliffs, rocky colluvial slopes, benches, terraces, and near drainage channels 

that are gently sloping to steep (3-50%) between 1402 and 1915 m elevation on all aspects. The 

unvegetated surface has moderate to high cover of gravel and low to moderate cover of large rocks 

and litter. Cryptogams are typically absent, but one stand has 75% cover. Parent materials include 

sandstones and shale. Soils are rapidly drained and variable in texture, including loams, sands, and 

clays, but are unified by a coating of fine to coarse gravels composed of sandstone, shale, basalt, or 

petrified wood. The vegetation is typically sparse (

Appendix C: Global and Local Plant Community Descriptions 


Distribution: 


Globally. This association occurs in Petrified Forest National Park in northern Arizona 

and Capitol Reef National Park in southeastern Utah. It is likely to occur on suitable habitat 

throughout the central Colorado Plateau. 

Petrified Forest National Park. Ephedra torreyana - Artemisia bigelovii Sparse Vegetation 

was sampled from twelve relevés. It occurred throughout the park, mostly on terraces, cliffs 

and plateaus, near drainage channels, on rocky slopes, rock piles, and sandy surfaces. Two of 

the stands occurred on midslopes. This association occurred throughout the entire project 

area, with relevés sampled from north of the Lithodendron Wash at Pilot Rock in the northern 

wilderness area, to the central neck of the park, The Flattops, and near Jim Camp Wash in the 

southern part of the park. 


Globally. This Colorado Plateau association has been described from Petrified Forest National 

Park in northern Arizona and Capitol Reef National Park in southeastern Utah, where 

it is widespread. Stands occur on plateaus, mesas, ridges, hills, cliffs, rocky colluvial slopes, 

benches, terraces, and near drainage channels that are gently sloping to steep (3-50%) between 

1402 and 1915 m elevation. Aspect is not an important factor in determining the distribution 

of this association. The unvegetated surface has moderate to high cover of gravel and 

low to moderate cover of large rocks and litter. Cryptogams are typically absent, but one stand 

had 75% cover. Parent materials include sandstones and shale of the Summerville, Entrada, 

Curtis, Chinle, Carmel, Salt Wash Member and Emery formations. Soils are rapidly drained 

and variable in texture, including loams, sands, and clays, but are unified by a coating of fine to 

coarse gravels composed of sandstone, shale, basalt, or petrified wood. 


6170 ft) elevation. Slopes ranged from none to steep (0-43%, average 8%). Several of the relevés 

had surface rocks that consisted of sandstone, basalt, various gravel, and petrified wood. 



Globally. This vegetation association is typically sparse (


Petrified Forest National Park. Ten relevés were classified as Ephedra torreyana - Artemisia 

bigelovii Sparse Vegetation, with total vegetation cover ranging from 10 to 40% (average 20%). 

The vegetation cover consisted of 9-20% within the shrub stratum (average 13%) and


C.5 Sparse 

C.5.3. Eriogonum leptophyllum Sparse Vegetation 




Slender.Buckwheat.Sparse.Vegetation 

Slenderleaf.Wild.Buckwheat.Sparse.Vegetation 

CEGL004013 

Summary: 

This sparsely vegetated badland association occurs at Petrified Forest National Park in northern 

Arizona and likely occurs elsewhere in the southern Colorado Plateau. Elevations at the national park 

range from 1710 to 1770 m (5620-5810 ft). Stands are found on gentle to moderately steep slopes and 

range between 4 and 65%. This association occurs on various landforms, including lower slopes, 

sideslopes, midslopes, bajadas, slick rock, buttes, cliffs, and plateaus. Substrates are clays derived from 

shale. The ground surface has high cover of bare soil. A few stands have surface rocks with substrates 

including petrified wood, sandstone, and mudstone. The vegetation cover is characterized by generally 

sparse (



Distribution: 

Global rank. GNR (14-Feb-2007). 

Globally. This association has only been described from Petrified Forest National Park in 

northeastern Arizona and likely occurs elsewhere in the Painted Desert of the southern Colorado 

Plateau. Until further inventory is completed, there is no global information. 

Petrified Forest National Park. Eriogonum leptophyllum Sparse Shrubland was identified 

from six relevés within Petrified Forest National Park. The association occurred on various 

landforms, including lower slopes, sideslopes, midslopes, bajadas, slick rock, buttes, cliffs, and 

plateaus. These relevés were located in the northern wilderness area, east of Tiponi Point, east 

of Tawa Point, and east of Old Route 66 in the northeastern section. They were also located in 

the central neck area of park, east of the park road in the badlands, as well as north of the Giant 

Logs and west of Jim Camp Wash. 





and 1770 m (5620-5810 ft). Slopes ranged from moderate to steep (4-65%, average 21%), with 

varying aspects. Most the stands occurred in badland areas throughout the project boundary. 

A few stands had surface rocks with substrates including petrified wood, sandstone, and 

mudstone. 





Petrified Forest National Park. Six relevés were classified as Eriogonum leptophyllum Sparse 

Shrubland, with total vegetation cover ranging from 7 to 23% (average 11%) and consisting of 

a shrub stratum with 5-17% cover and an herbaceous stratum with 1-5% cover. The species 

diversity ranged between 11 and 31 species (average 23 species). The vegetation in the shrub 

layer was dominated by Eriogonum leptophyllum, with between 2 and 4% cover (average 3%). 

Three species codominated the shrub layer in three distinct relevés, including Eriogonum 

subreniforme with 4% cover, Sisymbrium altissimum with 3% cover, and Gutierrezia sarothrae 

with 3% cover. 



Short.shrub/ Data are not available. Eriogonum leptophyllum 

sapling 




PEFO species 

Bromus tectorum, Sisymbrium 

altissimum 

References: 


C106


C.5 Sparse 

C.5.4. Zuckia brandegeei Sparse Vegetation 




Arizona.Siltbush.Sparse.Vegetation 

Siltbush.Sparse.Vegetation 

CEGL002493 

Summary: 

This sparsely vegetated association is common on plateaus at Petrified Forest National Park but occurs 

elsewhere on plains, alluvial fans, steep colluvial and badlands slopes, or shale hogbacks in the 

Colorado Plateau of northern Arizona and eastern Utah. Elevation ranges from 1341-1890 m (4397- 

6200 ft). The soil is a rapidly drained clay loam derived from shales such as the Salt Wash Member 

of the Morrison Formation or Chinle, Moenkopi and Curtis formations. The unvegetated surface 

typically has high cover of shale chips, sandstone rocks, basalt gravel, conglomerate, or petrified wood 

forming a desert pavement surface. Exposure of bare soil is low. The vegetation has a sparse canopy 

consisting of Zuckia brandegeei with scattered Atriplex confertifolia and Gutierrezia microcephala. The 

herbaceous layer is low in diversity and provides sparse cover. The bunch grasses Leymus salinus and 

Pleuraphis jamesii are present. Forbs include Platyschkuhria integrifolia and Xylorhiza venusta. 




Petrified Forest National Park. Zuckia brandegeei Sparse Vegetation was classified based on 

the sparse badland vegetation, as well as having a low cover of Zuckia brandegeei. This association 

did commonly contain another badland indicator species, Atriplex obovata; however, 

Atriplex obovata never dominates the vegetation. 

During the classification fieldwork, the Zuckia species was identified to the subspecies level as 

Zuckia brandegeei var. arizonica, a species endemic to northeastern Arizona and the southern 

Colorado Plateau. However, since an NVCS association already existed for Zuckia brandegeei 

at the species level, we decided to include these relevés in this pre-defined association. It is 

interesting to note, however, that this species is unique to this area and could be defined as a 

unique association if classified beyond the species level. 


Physiognomic class VII Sparse.Vegetation 

Physiognomic subclass VII.C. Unconsolidated.material.sparse.vegetation 

Physiognomic group VII.C.3. Sparsely.vegetated.soil.slopes 

Physiognomic subgroup VII.C.3.N. Natural/Semi-natural.sparsely.vegetated.soil.slopes 

Formation name VII.C.3.N.b. Dry.slopes 

Alliance name 

Zuckia brandegeei Sparse.Vegetation.Alliance.(A.2653),. 

Siltbush.Sparse.Vegetation.Alliance 



CES304.789 





C107


Distribution: 

Globally. This association is known from Arches, Capitol Reef, and Petrified Forest national 

parks but is also likely widespread in the Painted Desert and canyonlands regions of the Colorado 

Plateau in eastern Utah and northern Arizona. 

Petrified Forest National Park. Zuckia brandegeei Sparse Vegetation was identified from 17 

relevés within Petrified Forest National Park and on the Navajo Nation. This common association 

occurred mostly on plateaus, with one stand occurring on a bajada and another in 

the plains. The relevés in Petrified Forest National Park were located in the northern wilderness 

area northwest of Nizhoni Point, southwest of Lacey Point, in the Black Forest, north of 

Onyx Bridge and the Black Forest, and southwest of Chinde Mesa. This association was also 

identified from the northern half of the project boundary east of Lithodendron Wash and 

west of Lacey Point. Several of the stands were located near The Flattops, including east of 

The Flattops in the southern wilderness area, in The Flattops north of the main park road, 

southwest of The Flattops and south of the main park road, and north of Jim Camp Wash 

and west of The Flattops. In the southern half of the project boundary, this association is also 

found west of Dry Wash and the main park road, in the Crystal Forest in the southern wilderness 

area, west of the main park road in the Jasper Forest, south of the main road and north of 

Long Logs, and in the Rainbow Forest west of Giant Logs. The relevé that was sampled on the 

Navajo Nation land was located on the northeastern slopes of Chinde Mesa. 


Globally. This sparsely vegetated association is common on plateaus at Petrified Forest National 

Park but occurs elsewhere on plains, alluvial fans, steep colluvial and badlands slopes, 

or shale hogbacks in the Colorado Plateau of northern Arizona and eastern Utah. Elevation 

ranges from 1341-1890 m (4397-6200 ft). The soil is a rapidly drained clay loam derived from 

shales. Parent materials include the Salt Wash Member of the Morrison Formation; Chinle, 

Moenkopi and Curtis formations; or mixed colluvium. The unvegetated surface typically has 

high cover of shale chips, sandstone rocks, basalt gravel, conglomerate, or petrified wood 

forming a desert pavement surface. Exposure of bare soil is low. 

Petrified Forest National Park. This association was sampled between the elevations of 1660 

and 1790 m (5430-5880 ft). Slope ranged from none to moderately high (0-19%, average 6%). 

Most of the stands had surface rocks that included petrified wood and desert pavement; two 

had conglomerate and basalt gravel surface rocks. 



Globally. This association has a sparse canopy consisting of Zuckia brandegeei with scattered 

Artemisia bigelovii, Atriplex confertifolia, Atriplex obovata, Chrysothamnus viscidiflorus, 

Coleogyne ramosissima, Ericameria nauseosa, Eriogonum corymbosum, Eriogonum leptocladon, 

Ephedra torreyana, Ephedra viridis, Xylorhiza glabriuscula, Gutierrezia microcephala, and 

Gutierrezia sarothrae. The herbaceous layer is low in diversity and provides sparse cover. The 

bunch grasses Achnatherum hymenoides, Leymus salinus, and Pleuraphis jamesii are present. 

Forbs include Arabis holboellii, Cryptantha sp., Cymopterus acaulis, Eriogonum inflatum, Galium 

coloradoense, Penstemon barbatus, Platyschkuhria integrifolia, and Xylorhiza venusta. The 

exotic annual grass Bromus tectorum may be present in some stands. 

Petrified Forest National Park. Seventeen relevés were classified as Zuckia brandegeei Sparse 

Vegetation with total vegetation cover ranging from 1 to 6% (average 2%). The vegetation 

cover consisted of a shrub stratum with 0.5-4% cover (average 2%) and an herbaceous stratum 

with 0.5-3% cover (average 1%). The species diversity ranged from 4 to 23 species (average 11 

species). Zuckia brandegeei was commonly the dominant species; however, it could also act as 

an indicator species in these sparsely vegetated areas. It ranged in cover from 0 to 3% (average 

1%). 

C108



Stratum 

Short.shrub/ 

sapling 

Herb.(field) 


Zuckia brandegeei 


PEFO species 

N/A 

Zuckia brandegeei 




PEFO species 


References: 


C109


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Appendix D 

Plant species list 

The species list was compiled during the Petrified Forest National Park vegetation mapping 

project from data collected on classification relevés and from accuracy assessment 

observation sites, and observations of photointerpreters Locations for each plant were 

recorded in the respective databases for these field efforts. 

In some cases, the taxonomy of the species has changed since the original field work. We 

have kept the taxonomy used in the database, but have annotated this list to indicate where 

there have been updates in the International Taxonomic Information System (ITIS, http:// 

www.itis.gov) as of July 2008. 

This species list was compared to the currently published flora of the park (Hansen and 

Thomas 2006). Some species in the list were identified to subspecies or variety level, but that 

taxonomic level has not been identified in flora. Also, some species were not identified to the 

subspecies level, where they are in the flora. Some species appear to be new additions to the 

flora; however, they were not verified as no voucher specimen was collected. 

This list can be used as one guide to querying the field databases. In most cases, the species 

list gives a direct reference to the plant as it occurs in both the classification and accuracy 

assessment databases. For example, if the identity of a potentially new species to the flora, 

e.g. Yucca glauca, was to be verified in the field and a voucher collected, the field locations of 

the plant can be accessed by querying either database using the scientific name or TSN code. 

Two hundred seventy-six species, representing 42 families, were found during the field work. 

Asteraceae was represented by the most species (73), followed by Poaceae (50 species), 

Chenopodiaceae (19 species), and Polygonaceae (14 species). Eleven non-native species 

were noted. 

In the following table, the fields and their contents and sources are 

● Family and scientific name. The taxonomic name for the plant according to Integrated 

Taxonomic Information System (ITIS, http://www.itis.gov) at the time of the field work. 

● Common name. The common name for the plant according to ITIS. In some cases the 

ITIS common name is not the common name used regionally or by NatureServe. Where 

that is the case, we have included other regional common names. 

● TSN code. The ITIS Taxonomic Serial Number (TSN), accessed July 2008. 

● Synonym. The taxonomic name for the plant current to July 2008, if the taxonomy for the 

plant has changed since the fieldwork. 

● Non-native. Plants that are listed as non-native by the USDA PLANTS Database (http:// 

plants.usda.gov/) are indicated. 

D1

D2 

Appendix D 

Scientific Name Common Name Family Name Synonym TSN code Nonnative 

Abronia elliptica fragrant.white.sand.verbena Nyctaginaceae 19556 native 

Achnatherum hymenoides Indian.ricegrass Poaceae 507943 native 

Achnatherum sp. needlegrass Poaceae 21128 native 

Acroptilon repens hardheads Asteraceae 36459 native 

Allenrolfea occidentalis iodinebush Chenopodiaceae 20677 native 

Allium macropetalum largeflower.onion Liliaceae 42682 native 

Amaranthus albus pigweed Amaranthaceae 20719 native 

Amaranthus sp. pigweed Amaranthaceae 20715 native 

Ambrosia acanthicarpa annual.bursage Asteraceae 36497 native 

Andropogon gerardii bluejoint Poaceae 40462 native 

Andropogon sp. bluestem Poaceae 40450 native 

Arabis sp. rockcress Brassicaceae 22671 unknown 

Arenaria eastwoodiae Eastwood’s.sandwort Caryophyllaceae 20244 native 

Arenaria eastwoodiae var. adenophora Eastwood’s.sandwort Caryophyllaceae 184228 native 

Arenaria eastwoodiae var. eastwoodiae Eastwood’s.sandwort Caryophyllaceae 184227 native 

Aristida adscensionis sixweeks.threeawn Poaceae 41401 native 

Aristida purpurea purple.three-awn Poaceae 41429 native 

Aristida purpurea var. fendleriana fendler.threeawn Poaceae 531154 native 

Aristida purpurea var. longiseta Fendler.threeawn Poaceae 185314 native 

Aristida sp. threeawn Poaceae 41400 native 

Artemisia biennis biennial.sagewort Asteraceae 35451 native 

Artemisia bigelovii Bigelow.sage Asteraceae 35452 native 

Artemisia dracunculus ssp. dracunculus wormwood Asteraceae 183730 native 

Artemisia filifolia sand.sagebrush Asteraceae 35463 native 

Artemisia frigida fringed.sagebrush Asteraceae 35465 native 

Artemisia ludoviciana cudweed.sagewort Asteraceae 35474 native 

Artemisia tridentata big.sagebrush Asteraceae 35498 native 

Asteraceae sp. sunflowers Asteraceae 35420 unknown 

Astragalus albulus cibola.milkvetch Fabaceae 25407 native 

Astragalus amphioxys cresent.milkvetch Fabaceae 25414 native 

Astragalus kentrophyta var. elatus tall.spiny.milkvetch Fabaceae 526905 native 


D3 

Appendix D continued 

Scientific name Common name Family name TSN code Nonnative 

Astragalus mollissimus var. thompsoniae Thompson.woolly.milkvetch Fabaceae 192649 native 

Astragalus sp. astragalus Asteraceae 25392 native 

Atriplex argentea silverscale Chenopodiaceae 20512 native 

Atriplex canescens fourwing.saltbush Chenopodiaceae 20518 native 

Atriplex confertifolia shadscale Chenopodiaceae 20519 native 

Atriplex obovata mound.saltbush Chenopodiaceae 20552 native 

Atriplex powellii Powell’s.saltbush Chenopodiaceae 20561 native 

Atriplex saccaria sack.saltbush Chenopodiaceae 20564 native 

Boerhavia spicata creeping.spiderling Nyctaginaceae 19678 native 

Bouteloua barbata sixweeks.grama Poaceae 41498 native 

Bouteloua curtipendula sideoats.grama Poaceae 41500 native 

Bouteloua eriopoda black.grama Poaceae 41501 native 

Bouteloua gracilis blue.grama Poaceae 41493 native 

Bouteloua hirsuta hairy.grama Poaceae 41502 native 

Bouteloua simplex hairy.grama Poaceae 41507 native 

Brassicaceae mustards Brassicaceae 22669 unknown 

Brickellia oblongifolia var. linifolia Narrowleaf.brickellbush Asteraceae 526986 native 

Bromus japonicus Japanese.brome Poaceae 40479 native 

Bromus rubens foxtail.brome Poaceae 40518 non-native 

Bromus sp. brome Poaceae 40478 unknown 

Bromus tectorum cheat.grass Poaceae 40524 non-native 

Cactaceae cactus Cactaceae 19685 unknown 

Caesalpinia jamesii james.rushpea Fabaceae 26505 native 

Calamovilfa gigantea Giant.sandreed,big.sandreed Poaceae 41538 native 

Calochortus aureus golden.mariposa.lily Liliaceae 42836 native 

Calochortus sp. mariposa.lily Liliaceae 42823 unknown 

Castilleja integra squawfeather,.wholeleaf.Indian. Scrophulariaceae 33131 native 

paintbrush 

Castilleja linariifolia Wyoming.Indian.paintbrush Scrophulariaceae 33138 native 

Castilleja sp. Indian.paintbrush Scrophulariaceae 33049 unknown 

Chaenactis stevioides Steve’s.dusty.maiden Asteraceae 36998 native 

Chaetopappa ericoides rose.heath Asteraceae 501376 native 

Appendix D: Plant species list

D4 



Chaetopappa sp. least.daisy Asteraceae 37004 unknown 

Chamaesyce albomarginata rattlesnake.weed Euphorbiaceae 501400 native 

Chamaesyce fendleri Fendler’s.sandmat Euphorbiaceae 501419 native 

Chamaesyce parryi Parry’s.sandmat Euphorbiaceae 501448 native 

Chamaesyce revoluta threadstem.spurge Euphorbiaceae 501456 native 

Chenopodium berlandieri netseed.lambsquarters Chenopodiaceae 20594 native 

Chenopodium fremontii Fremont.goosefoot Chenopodiaceae 20607 native 

Chenopodium leptophyllum narrowleaf.goosefoot Chenopodiaceae 20616 native 

Chrysothamnus depressus dwarf.rabbitbrush Asteraceae 37051 native 

Chrysothamnus greenei Greene.rabbitbrush Asteraceae 37052 native 

Cirsium sp. thistle Asteraceae 36334 unknown 

Comandra umbellata ssp. pallida bastard.toadflax Santalaceae 523879 native 

Conyza canadensis Canada.horseweed Asteraceae 37113 native 

Cordylanthus wrightii Wright’s.bird’s-beak Scrophulariaceae 33577 native 

Corispermum nitidum shiny.bugseed Chenopodiaceae 565088 native 

Croton texensis croton Euphorbiaceae 28291 native 

Cryptantha crassisepala deertongue Boraginaceae 31800 native 

Cryptantha fulvocanescens var. fulvocanescens tawny.cryptantha Boraginaceae 527561 native 

Cryptantha micrantha purpleroot.pick-me-not Boraginaceae 31836 native 

Cryptantha sp. cryptantha Boraginaceae 31765 unknown 

Cymopterus sp. cymopterus Apiaceae 29625 unknown 

Cystopteris fragilis brittle.bladder.fern Dryopteridaceae 17482 native 

Dalea candida var. oligophylla white.dalea Fabaceae 192889 native 

Dalea lanata var. terminalis wooley.praire.clover Fabaceae 192900 native 

Dasyochloa pulchella fluffgrass Poaceae 512087 native 

Datura wrightii sacred.datura Solanaceae 30521 native 

Descurainia pinnata green.tansymustard Brassicaceae 22826 native 

Dimorphocarpa wislizeni spectacle.pod Brassicaceae 502067 native 

Distichlis spicata desert.saltgrass Poaceae 40662 native 

Echinocereus coccineus var. coccineus Bisbee.cactus Cactaceae 527813 native 

Echinocereus sp. hedgehog.cactus Cactaceae 19803 unknown 

Elaeagnus angustifolia oleaster Elaeagnaceae 27770 non-native 


D5 



Elymus elymoides bottlebrush.squirreltail Poaceae 502264 native 

Elymus elymoides ssp. elymoides bottlebrush.squirreltail Poaceae 525113 native 

Ephedra nevadensis Nevada.Ephedra Ephedraceae 502316 native 

Ephedra sp. Ephedra Ephedraceae 183496 unknown 

Ephedra torreyana Torrey.Ephedra Ephedraceae 502318 native 

Ephedra viridis green.Ephedra Ephedraceae 502319 native 

Eragrostis sp. lonegrass Poaceae 40716 native 

Eragrostis spectabilis purple.lovegrass Poaceae 40717 native 

Ericameria nauseosa goldenbush Asteraceae 507594 native 

Ericameria nauseosa ssp. nauseosa var. nauseosa rubber.rabbitbush Asteraceae Ericameria nauseo- 531871 

sa var. nauseosa 

native 

Ericameria pulchella southwest.rabbitbrush Asteraceae Chrysothamnus 37084 

pluchellus 

native 

Erigeron compactus cushion.daisy Asteraceae 35842 native 

Erigeron concinnus Navajo.feabane Asteraceae 502385 native 

Erigeron divergens spreading.daisy Asteraceae 35852 native 

Erigeron sp. feabane Asteraceae 35803 unknown 

Eriogonum alatum wind.wildbuckwheat Polygonaceae 21057 native 

Eriogonum corymbosum corymbed.buckwheat Polygonaceae 21103 native 

Eriogonum corymbosum var. aureum crispleaf.buckwheat Polygonaceae 195444 native 

Eriogonum corymbosum var. glutinosum crispleaf.buckwheat Polygonaceae 535113 native 

Eriogonum deflexum Flatcrown.buckwheat Polygonaceae 21111 native 

Eriogonum divaricatum divergent.buckwheat Polygonaceae 21117 native 

Eriogonum ericifolium Yavapai.buckwheat Polygonaceae 21128 native 

Eriogonum ericifolium var. pulchrum Mexican.panicgrass Poaceae 40939 native 

Eriogonum ericifolium var. pulchrum Yavapai.buckwheat Polygonaceae 195461 native 

Eriogonum jamesii var. jamesii James.buckwheat Polygonaceae 195499 native 

Eriogonum leptocladon fine.branched.buckwheat Polygonaceae 21179 native 

Eriogonum leptocladon var. ramosissimum sand.buckwheat Polygonaceae 528007 native 

Eriogonum leptophyllum slender-leaf.buckwheat Polygonaceae 21180 native 

Eriogonum microthecum slender.buckwheat Polygonaceae 21192 native 

Eriogonum sp. buckwheat Polygonaceae 21054 native 


D6 



Eriogonum subreniforme kidneyshape.buckwheat Polygonaceae 21251 native 

Erodium cicutarium alfilaree Geraniaceae 29147 non-native 

Evolvulus nuttallianus shaggy.dwarf.morningglory Convolvulaceae 502573 native 

Forestiera pubescens var. pubescens New.Mexico.forestiera Oleaceae 528175 native 

Gaillardia pinnatifida blanketflower Asteraceae 37409 native 

Gilia multiflora many-flower.gilia Polemoniaceae Ipomopsis multiflora 

503187 

native 

Gilia sp. gilia Polemoniaceae 31075 unknown 

Gutierrezia microcephala threadleaf.snakeweed Asteraceae 37482 native 

Gutierrezia sarothrae broom.snakeweed Asteraceae 37483 native 

Helianthus annuus annual.sunflower Asteraceae 36616 native 

Heliomeris multiflora var. multiflora showy.goldeneye Asteraceae 528364 native 

Hesperostipa comata ssp. comata needle.and.thread Poaceae 525116 native 

Hesperostipa neomexicana New.Mexico.feathergrass Poaceae 507976 native 

Hesperostipa sp. needle.and.thread Poaceae 500937 unknown 

Heterotheca sp. false.goldenaster Asteraceae 37652 unknown 

Heterotheca villosa hairy.false.goldaster Asteraceae 37689 native 

Hordeum jubatum foxtail.barley Poaceae 40871 non-native 

Hordeum pusillum little.barley Poaceae 40866 native 

Hordeum sp. hordeum Poaceae Agrohordeum 41366 unknown 

Hymenopappus filifolius var. lugens Idaho.hymenopappus Asteraceae 528521 native 

Hymenopappus filifolius var. pauciflorus fineleaf.hymenopappus Asteraceae 528527 native 

Hymenopappus flavescens var. canotomentosus college.flower Asteraceae 528530 native 

Hymenopappus sp. hymenopappus Asteraceae 37763 unknown 

Hymenoxys richardsonii Colorado.rubberweed Asteraceae 37785 native 

Hymenoxys richardsonii var. floribunda Colorado.rubberweed Asteraceae 528536 native 

Hymenoxys sp. rubberweed Asteraceae 37778 unknown 

Ipomopsis longiflora flaxflowered.gilia Polemoniaceae 31198 native 

Ipomopsis longiflora ssp. longiflora flaxflowered.gilia Polemoniaceae 524182 native 

Ipomopsis multiflora many-flower.gilia Polemoniaceae 503187 native 

Ipomopsis polycladon manybranched.gilia Polemoniaceae 31216 native 

Ipomopsis pumila dwarf.gilia Polemoniaceae 31217 native 


D7 



Ipomopsis sp. gilia Polemoniaceae 31191 unknown 

Isocoma acradenia alkali.goldenbush,alkali.jimmyweed Asteraceae 503207 native 

Isocoma drummondii drummond.goldenweed Asteraceae 37803 native 

Isocoma sp. sunflower Asteraceae Anisocoma 36530 unknown 

Iva acerosa copperweed Asteraceae 36026 native 

Juniperus monosperma oneseed.juniper Cupressaceae 194853 native 

Kochia americana green.molly Chenopodiaceae 20694 native 

Krascheninnikovia lanata winterfat Chenopodiaceae 503290 native 

Lappula occidentalis flat-spine.sheepbur Boraginaceae 503329 native 

Lappula occidentalis var. cupulata flat-spine.sheepburr Boraginaceae 528677 native 

Lepidium montanum Montana.pepperweed Brassicaceae 503381 native 

Lesquerella fendleri Fendler.bladderpod Brassicaceae 23180 native 

Linum aristatum bristle.flax Linaceae 29231 native 

Lycium pallidum pale.desert-thorn Solanaceae 30544 native 

Lygodesmia sp. skeleton.plant Asteraceae 500397 unknown 

Machaeranthera bigelovii Bigelow’s.machaeranthera Asteraceae 37980 native 

Machaeranthera canescens hoary.aster Asteraceae 37984 native 

Machaeranthera canescens ssp. glabra var. hoary.tansyaster Asteraceae Machaeranthera 566721 

glabra canescens var. native 

glabra 

Machaeranthera canescens ssp. canescens var. hoary.tansyaster Asteraceae Machaeranthera 531699 

canescens canescens var. native 

canescens 

Machaeranthera gracilis slender.goldentweed Asteraceae 37991 native 

Machaeranthera grindelioides var. grindelioides rayless.aster Asteraceae 529072 native 

Machaeranthera pinnatifida cutleaf.goldenweed Asteraceae 38005 native 

Machaeranthera tanacetifolia tanseyleaf.goldenweed Asteraceae 38103 native 

Malacothrix sp. desert.dandelion Asteraceae 38043 unknown 

Mentzelia albicaulis white.blazingstar Loasaceae 503757 native 

Mentzelia multiflora Adonis.blazingstar Loasaceae 503788 native 

Mentzelia pumila dwarf.blazingstar Loasaceae 503800 native 

Mentzelia pumila var. pumila dwarf.mentzelia Loasaceae 529155 native 

Mirabilis linearis linearleaf.four-o’clock Nyctaginaceae 19651 native 


D8 



Mirabilis multiflora Colorado.four.o’clock Nyctaginaceae 19654 native 

Monroa squarrosa false.buffalo.grass Poaceae 41882 native 

Monroa squarrosa false.buffalo.grass Poaceae 41882 native 

Muhlenbergia porteri bush.muhly Nyctaginaceae 41933 native 

Muhlenbergia pungens sandhill.muhly Poaceae 41934 native 

Muhlenbergia sp. muhly Poaceae 41883 native 

Muhlenbergia torreyi ring.muhly Poaceae 503886 native 

Oenothera albicaulis halfshrub.sundrop Onagraceae 27373 native 

Oenothera caespitosa tufted.eveningprimrose Onagraceae 27382 native 

Oenothera caespitosa ssp. caespitosa tufted.evening-primrose Onagraceae 566058 native 

Oenothera flava long-tube.evening.primrose Onagraceae 27397 native 

Oenothera pallida pale.evening.primrose Onagraceae 27436 native 

Oenothera pallida ssp. runcinata pale.eveningprimrose Onagraceae 27439 native 

Oenothera sp. evening.primrose Onagraceae 27367 native 

Opuntia erinacea grizzlybear.pricklypear Cactaceae 19705 native 

Opuntia polyacantha plains.pricklypear Cactaceae 19726 native 

Opuntia polyacantha var. polyacantha hair-spine.prickly-pear Cactaceae 195296 native 

Opuntia polyacantha var. rufispina hairspine.pricklypear Cactaceae 195298 native 

Opuntia sp. Cactus Cactaceae 19686 native 

Opuntia whipplei Whipple.cholla Cactaceae 19745 native 

Orobanche sp. broomrape Orobanchaceae 34277 unknown 

Panicum capillare annual.witchgrass Poaceae 40914 native 

Panicum hirticaule Mexican.panicgrass Poaceae 40939 native 

Parryella filifolia common.dunebroom Fabaceae 26831 native 

Pascopyrum smithii pubescent.wheatgrass Poaceae 504124 native 

Pectis angustifolia lemonscent Asteraceae 38176 native 

Petradoria pumila rock.goldenrod Asteraceae 38233 native 

Phacelia crenulata caterpillerweed Hydrophyllaceae 31478 native 

Phacelia crenulata var. corrugata cleftleaf.scorpion-weed Hydrophyllaceae 529549 native 

Phacelia integrifolia gypsum.phacelia Hydrophyllaceae 504272 native 

Phacelia sp. phacelia Hydrophyllaceae 31433 unknown 

Phoradendron juniperinum juniper.mistletoe Viscaceae 27866 native 


D9 



Physaria newberryi Newberry’s.twinpod Brassicaceae 23281 native 

Pinus edulis Colorado.pinyon Pinaceae 183336 native 

Plantago argyraea salt-meadow.plantain Plantaginaceae 32898 native 

Plantago patagonica woolly.Indianwheat Plantaginaceae 32907 native 

Pleuraphis jamesii galleta Poaceae 507993 native 

Polypogon monspeliensis annual.rabbitsfoot Poaceae 41171 non-native 

Populus fremontii cottonwood Salicaceae 22459 native 

Portulaca oleracea akulikuli-kula,.purslane Portulacaceae 20422 native 

Pseudocymopterus sp. false.spring.parseley Apiaceae 29835 unknown 

Psilostrophe sparsiflora greenstem.paperflower Asteraceae 38315 native 

Psoralidium lanceolatum dune.scurfpea Fabaceae 504645 native 

Purshia stansburiana Stansbury.cliffrose Rosaceae 195901 native 

Rhus trilobata Skunkbush Anacardiaceae 28791 native 

Salix exigua coyote.willow Salicaceae 22529 native 

Salsola kali ssp. tragus prickly.Russian.thistle Chenopodiaceae Salsola tragus 525004 non-native 

Salsola tragus prickly.Russian.thistle Chenopodiaceae 520950 non-native 

Salvia pachyphylla blue.sage Lamiaceae 32730 native 

Sanvitalia aberti albert.creeping.zinnia Asteraceae 38356 native 

Sarcobatus vermiculatus black.greasewood Chenopodiaceae 20707 native 

Senecio flaccidus var. flaccidus threadleaf.groundsel Asteraceae 530313 native 

Senecio sp. groundsel Asteraceae 36084 unknown 

Senecio spartioides groundsel Asteraceae 36184 native 

Senecio spartioides var. multicapitatus broomlike.ragwort Asteraceae 531525 native 

Senecio spartioides var. spartioides broomlike.ragwort Asteraceae 531235 native 

Sisymbrium altissimum Jim.Hill.mustard Brassicaceae 23312 non-native 

Solanum elaeagnifolium silverleaf.nightshade Solanaceae 30429 native 

Solanum jamesii wild.potato Solanaceae 30437 native 

Sonchus asper perennial.sowthistle Asteraceae 38424 non-native 

Sphaeralcea ambigua desert.globemallow Malvaceae 21910 native 

Sphaeralcea coccinea copper.mallow Malvaceae 21920 native 

Sphaeralcea hastulata spear.globemallow Malvaceae 21942 native 


D10 



Sphaeralcea incana gray.globemallow Malvaceae 21943 native 

Sphaeralcea incana ssp. incana gray.globemallow Malvaceae 21944 native 

Sphaeralcea parvifolia smallflower.globemallow Malvaceae 21953 native 

Sphaeralcea sp. globemalow Malvaceae 21909 native 

Sporobolus airoides alkali.sacaton Poaceae 42128 native 

Sporobolus contractus spike.dropseed Poaceae 42131 native 

Sporobolus coromandelianus Madagascar.dropseed Poaceae 507183 native 

Sporobolus cryptandrus sand.dropseed Poaceae 42132 native 

Sporobolus flexuosus mesa.dropseed Poaceae 42137 native 

Sporobolus giganteus giant.dropseed Poaceae 42138 native 

Stanleya pinnata desert.prince’splume Brassicaceae 23329 native 

Stephanomeria exigua wire.lettuce Asteraceae 38445 native 

Suaeda moquinii alkali.seepweed Chenopodiaceae 505404 native 

Tamarix chinensis China.tamarisk Tamaricaceae 22308 non-native 

Tetraneuris ivesiana Ivers’.four-nerve-daisy Asteraceae 38512 native 

Thelesperma megapotamicum green.threads Asteraceae 38525 native 

Townsendia annua annual.townsendia.daisy Asteraceae 38538 native 

Townsendia sp. Townsend.daisy Asteraceae 38535 unknown 

Typha domingensis southern.cattail Typhaceae 42327 native 

Vulpia octoflora eight-flower.six-weeks.grass Poaceae 42264 native 

Vulpia octoflora var. hirtella sixweeks.fescue Poaceae 530862 native 

Wyethia scabra badland.mulesears Asteraceae 38687 native 

Xanthium strumarium cocklebur Asteraceae 38692 native 

Xanthium strumarium var. canadense Canada.cocklebur Asteraceae 530872 native 

Yucca angustissima narrowleaf.yucca Agavaceae 43131 native 

Yucca baccata banana.yucca Agavaceae 43134 native 

Yucca glauca beargrass Agavaceae 43142 native 

Yucca sp. yucca Agavaceae 43116 native 

Zinnia grandiflora plains.zinnia Asteraceae 38715 native 

Zuckia brandegeei siltbush Chenopodiaceae 505810 native 

Zuckia brandegeei var. arizonica Arizona.siltbush Chenopodiaceae 530924 native 


Appendix E 

Plant community and map class key 

The plant community and map class key, developed to identify plant communities (NVC associations, 

alliances and park specials) and map classes (base, group, management, and macrogroup) 

was used in the field during accuracy assessment of the Petrified Forest National Park vegetation 

mapping project. It can be used at Petrified Forest NP in areas of at least 0.5 ha in size (e.g. 

a circle within a 40-m radius). Most base map classes key to one plant community, but some are 

aggregations of more than one plant community and may appear in several places in the dichotomous 

key. 

Because the group, management, and macrogroup map classes are aggregations of base map 

classes, they also appear multiple times in the key. The group class may represent aggregations 

of the base map classes to the group level of the National Vegetation Classification Standard 

(NVCS), version 2 (2008). Terrestrial ecological systems, as described by NatureServe, were used 

as a first approximation of the group level. The macrogroup map classes represent aggregations 

of base map classes to the macrogroup level of the NVCS Version 2, as approximated by the 

project team. The management map classes were developed in consultation with park staff, with 

the intent of preserving high map accuracy while maintaining base map classes that are of importance 

to park managers. 

The key begins with a lifeform key that separates the observed vegetation or land cover into one 

of four lifeform types, each with a subkey. The subkeys consist of decision couplets that describe 

the vegetation characteristics and typical geomorphic setting. Communities containing the same 

species may be separated into different associations, or even lifeforms, due to differences in cover 

and/or habitat. Because of this, both parts of the couplet should be considered before proceeding 

through the key. As is the case with a botanical key, often it is important to follow the key a 

few couplets beyond the point where you believe you may have correctly identified a map label 

or association because you may find a better fit in subsequent steps, or you may gain increased 

confidence that your initial choice was correct. 

At Petrified Forest National Park, fluctuations in precipitation between drought and wet years 

affects the cover of vegetation. Herbaceous perennial plants may be driven into dormancy and 

show lower cover than expected. during droughts. Alternatively, a flush of annual forb growth 

may follow a wet period. This fluctuations in cover needs to be considered when using a key 

developed for average conditions. 

Some map labels are based on landforms, such as “Barren Badlands”, where existing vegetation 

is very sparse. However, it is important to remember that the vegetation at Petrified Forest 

National Park can be very sparse (


Lifeform Key 

1a.. 

1b.. 

.Site.is.either.barren.(non-vegetated),.sparsely.vegetated.(≤2%.vegetation),.or.characterized. 

by.a.geomorphic.feature.or.an.anthropogenic.land.use.with.up.to.10%.vegetation.cover.. 

The.site.may.be.characterized.by.a.barren.geomorphic.feature,.i.e..sand.or.barren.wash,.or. 

a.sparsely.vegetated.to.vegetated.anthropogenic.land.use,.i.e..park.facilities.and.railroad.. 

SPARSE.VEGETATION.AND.BARREN.(Key.A,.go.to.4a) 

.Site.with.>2%.vegetation.or.not.characterized.by.a.geomorphic.feature.or.an.anthropogenic. 

land.use.with.up.to.10%.vegetation..(2a) 

2a.. 

2b.. 

3a.. 

3b.. 

.Site.characterized.by.tree.and/or.shrub.cover..If.tree.or.shrub.cover.is.>15%.cover,.grasses. 

and.forbs.may.have.higher.cover.than.trees.or.shrubs..If.tree.or.shrub.cover.is.

Appendix E: Plant community and map class key 

-. 

Management.map.class:.Park.Facilities 

-. 

Association:.NA 

. . b...Park.Sites.–.This.map.class.consists.of.the.tourist.sites.in.Petrified.Forest.National. 

Park,.including.the.Puerco.River.pueblo.and.the.overlooks. 

-. 

Base.map.class:.Park.Sites 

-. 

Group.map.class:.Park.Facilities 

-. 

Management.map.class:.Park.Sites 

-. 


. . c...Railroad.–.This.map.class.consists.of.the.railroad.that.bisects.the.park.and.travels. 

east/west.through.the.project.boundary. 

-. 

Base.map.class:.Railroad 

-. 

Group.map.class:.Transportation 

-. 

Management.map.class:.Railroad 

-. 


. . d..Roads.–.This.map.class.consists.of.paved.and.non-paved.roads. 

-. 

Base.map.class:.Roads 

-. 

Group.map.class:.Transportation 

-. 

Management.map.class:.Roads 

-. 


. . e...Run-off.Control.Feature.–.This.map.class.contains.human.features.that.were.developed.to.divert.water.flow.to.particular.areas. 

-. 

Base.map.class:.Run-off.Control.Feature 

-. 

Group.map.class:.Agriculture 

-. 

Management.map.class:.Run-off.Control.Feature 

-. 


. . f...Stock.Ponds.–.This.map.class.contains.water.tanks.and.stock.ponds.used.for.cattle. 

and.other.agricultural.purposes. 

-. 

Base.map.class:.Stock.Ponds 

-. 

Group.map.class:.Agriculture 

-. 

Management.map.class:.Stock.Ponds 

-. 


7b... Site.not.characterized.as.above..If.vegetated,.but.with.low.cover.(10%.cover;.in. 

particularly.dry.sites.vegetation.cover.can.be.as.low.as.2%..Tree.and.shrub.total.cover.must.be.


12a.. 

12b.. 

13a.. 

13b.. 

14a.. 

14b.. 

15a.. 

15b.. 

16a.. 

16b.. 

17a.. 

17b.. 

18a.. 

.Bouteloua gracilis.is.the.only.dominant.species;.no.other.perennial.herbaceous.species. 

codominates....Other.herbaceous.species,.including.annual.species,.may.cover.over.half.of. 

the.herbaceous.cover..This.map.class.tends.to.occur.in.various.substrates.and.ranges.from. 

moderate.to.low.total.vegetation.cover. 

•. Base.map.class:.Blue.Grama.Herbaceous.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Semi-Desert.Grassland 

•. Management.Map.Class:.Blue.Grama.Steppe.and.Mixed.Grasslands 

•. Association:.Bouteloua gracilis.Herbaceous.Vegetation 

.Bouteloua gracilis.is.not.the.only.dominant.species..Other.grass.species.codominate.the. 

herbaceous.cover..(13a) 

.Herbaceous.cover.is.co-dominated.by.Pleuraphis jamesii..This.map.class.commonly.occurs.on. 

sandy.soils.and.may.have.a.low.cover.of.native.shrubs. 

•. Base.map.class:.Blue.Grama.-.Galleta.Herbaceous.Vegetation 

•. Groupmap.class:.Inter-Mountain.Basins.Semi-Desert.Grassland 

•. Management.map.class:.Blue.Grama.Steppe.and.Mixed.Grasslands 

•. Association:.Bouteloua gracilis.-.Pleuraphis jamesii Herbaceous.Vegetation 

.Sporobolus airoides.is.the.co-dominant.species..This.map.class.commonly.occurs.on.sandy. 

soils.and.may.have.a.low.cover.of.native.shrubs. 

•. Base.Map.Class:.Alkali.Sacaton.-.Blue.Grama.Herbaceous.Vegetation 

•. Group.Map.Class:.Inter-Mountain.Basins.Semi-Desert.Grassland 

•. Management.Map.Class:.Alkali.Sacaton.Steppe.and.Mixed.Grasslands 

•. Association:.Sporobolus airoides.-.Bouteloua gracilis.Herbaceous.Vegetation 

Sporobolus airoides.is.the.dominant.or.co-dominant.species..(15a) 

Sporobolus airoides.is.not.the.dominant.or.co-dominant.species..(17a) 

.Sporobolus airoides.is.the.only.dominant.species..Other.herbaceous.and.shrub.species.may. 

occur,.but.never.with.significant.cover..This.map.class.tends.to.occur.on.various.substrates. 

and.ranges.from.fairly.dense.patches.to.low.total.vegetation.cover. 

•. Base.map.class:.Alkali.Sacaton.Herbaceous.Vegetation 


•. Management.map.class:.Alkali.Sacaton.Steppe.and.Mixed.Grasslands 

•. Association:.Sporobolus airoides.Southern.Plains.Herbaceous.Vegetation 

.Sporobolus airoides.is.not.the.only.dominant.species...Other.grass.species.codominate.the. 

herbaceous.cover..(16a) 

.Pleuraphis jamesii is.co-dominant.with.Sporobolus airoides..Commonly.occurs.on.sandy.soils. 

and.may.have.a.low.cover.of.native.shrubs. 

•. Base.map.class:.Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation 



•. Association:.Pleuraphis jamesii -.Sporobolus airoides.Herbaceous.Vegetation 

.Bouteloua gracilis.is.co-dominant.with.Sporobolus airoides..Commonly.occurs.on.a.variety.of. 

substrates.and.may.have.a.low.cover.of.native.shrubs. 

•. Base.map.class:.Alkali.Sacaton.-.Blue.Grama.Herbaceous.Vegetation 




Pleuraphis jamesii is.the.dominant.or.co-dominant.species..(18a) 

Pleuraphis jamesii is.not.the.dominant.or.co-dominant.species..(20a) 

.Bouteloua eriopoda.is.the.next.most.abundant.grass.after.Pleuraphis jamesii,.and.in.some. 

areas.is.the.two.species.codominate..A.low.cover.of.native.shrubs.may.also.occur. 

•. Base.map.class:.Black.Grama.-.Galleta.Herbaceous.Vegetation 



E4


18b.. 

19a.. 

19b.. 

20a.. 

20b.. 

21a.. 

21b.. 

22a.. 

22b.. 

23a.. 

23b.. 

24a.. 

•. 

Association:.Bouteloua eriopoda.-.Pleuraphis jamesii Herbaceous.Vegetation 

Herbaceous.species.cover.not.as.above..(19a) 

.Sporobolus airoides.is.the.next.most.abundant.grass.after.Pleuraphis jamesii and.in.some. 

areas.is.the.two.species.codominate..Commonly.occurs.on.sandy.soils.and.may.have.a.low. 

cover.of.native.shrubs.. 

•. Base.map.class:.Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation 



•. Association:.Pleuraphis jamesii -.Sporobolus airoides.Herbaceous.Vegetation 

.Bouteloua gracilis.is.the.next.most.abundant.grass.after.Pleuraphis jamesii and.in.some.areas.the.two.species.codominate..Commonly.occurs.on.sandy.soils.and.may.have.a.low.cover. 

of.native.shrubs.. 

•. Base.map.class:.Alkali.Sacaton.-.Blue.Grama.Herbaceous.Vegetation 




.Bouteloua eriopoda.is.the.dominant.herbaceous.species,.and.Pleuraphis jamesii commonly. 

occurs.as.a.significant.component.of.the.herbaceous.cover..This.map.class.typically.has.a.low. 

cover.of.shrubs.as.well.. 

Dominant.herbaceous.vegetation.not.as.above..(21a) 

.Calamovilfa gigantea.is.the.dominant.herbaceous.species..This.tall.grass.commonly.occurs.in. 

long.linear.stretches.along.washes.and.in.areas.with.periodic.water.flow. 

•. Base.map.class:.Giant.Sandreed.Desert.Wash.Shrub.Herbaceous.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Wash 

•. Management.map.class:.Vegetated.Wash.Complex 

•. Association:.Calamovilfa gigantea.Desert.Wash.Shrub.Herbaceous.Vegetation 


.Sporobolus cryptandrus.is.the.dominant.herbaceous.species..Typically.occurs.on.sandy.soils. 

or.on.sand.dunes.and.is.found.in.small.patches.throughout.the.park..Where.it.occurred,.it. 

was.mapped.as.part.of.the.polygon.describing.the.vegetation.surrounding.it. 

•. Association:.Sporobolus cryptandrus.Great.Basin.Herbaceous.Vegetation 


.Sporobolus coromandelianus.is.the.dominant.herbaceous.species.and.composes.over.half. 

of.the.total.herbaceous.cover..No.perennial.grasses.occur.with.>1%.of.the.total.cover..This. 

grass.is.an.annual.species.and.its.cover.may.fluctuate.depending.on.the.growing.season.and. 

year..Where.it.occurred,.it.was.mapped.as.part.of.the.polygon.describing.the.vegetation.surrounding.it. 

•. Association:.Sporobolus coromandelianus.Herbaceous.Vegetation.[Park.Special] 

Dominant.herbaceous.species.not.as.above..(24a) 

.Salsola tragus,.an.annual.exotic.species,.is.the.dominant.herbaceous.species..A.very.low. 

cover.of.perennial.species.may.occur,.however.Salsola tragus.generally.has.>90%.of.the.total. 

vegetation.cover..If.a.low.cover.of.perennial.species.occurs.on.the.site,.use.the.Lifeform.Key. 

above.to.determine.if.the.perennial.vegetation.better.defines.the.site..Salsola tragus.varies. 

significantly.in.cover.depending.on.seasonality.and.annual.precipitation..This.map.class. 

tends.to.be.restricted.to.sites.that.are.almost.entirely.homogenous.patches.of.Salsola tragus. 

and.occurs.on.unstable,.disturbed.surfaces,.and/or.sandy.substrates..It.typically.occurs.on. 

sand.dunes.or.in.human.disturbed.areas,.such.as.along.roads.or.pipeline.corridors. 

•. Base.map.class:.Russian.Thistle.Sand.Dune.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Active.and.Stabilized.Dune 

•. Management.map.class:.Russian.Thistle.Sand.Dune.Vegetation 

•. Association:.Salsola tragus.Sand.Dune.Vegetation.[Park.Special] 

E5


E6 

24b.. 

25a.. 

25b.. 

26a.. 

26b.. 

27a.. 

27b.. 

28a.. 

28b.. 

.Dominant.herbaceous.species.not.as.above,.or.shrub.or.tree.cover.is.greater.than.half.of.the. 

total.herbaceous.cover,.less.than.the.total.herbaceous.cover,.and.


class.is.distinguished.by.its.landform.characteristic.and.occurs.in.areas.of.intermittent.flooding,.such.as.washes,.along.wash.banks,.and.on.wash.terraces..This.map.class.contains.a.mix. 

of.herbaceous.and.shrub.species..No.one.individual.association.was.determined.to.represent. 

this.map.class.which.contains.a.complex.of.associations.and.unique.communities..Associations.that.can.occur.in.this.complex.include,.but.are.not.limited.to,.Allenrolfea 

occidentalis. 

Shrubland,.Calamovilfa gigantea.Desert.Wash.Shrub.Herbaceous.Vegetation,.Ericameria 

nauseosa.Desert.Wash.Shrubland,.Ericameria nauseosa./.Bouteloua gracilis.Shrub.Herbaceous.Vegetation,.Isocoma 

drummondii./.Pleuraphis jamesii Shrubland,.Salix exigua./.Barren. 

Shrubland,.Sarcobatus vermiculatus./.Atriplex obovata.Shrubland,.Sarcobatus vermiculatus./. 

Suaeda moquinii.Shrubland,.Suaeda moquinii.Shrubland,.Tamarix.spp..Semi-Natural.Temporarily.Flooded.Shrubland..This.map.class.contains.a.mix.of.species.and.associations.and.was. 

defined.as.a.heterogeneous.group.of.associations.. 

•. Base.map.class:.Vegetated.Wash.Complex 



•. Association:.NA 

Key C: Woodlands 

Trees.are.the.dominant.lifeform..Total.vegetation.cover.is.generally.>10%.cover,.except.in.dry.sites. 

where.vegetation.cover.can.be.as.low.as.2%.cover..Trees.dominate.the.woodlands.and.generally. 

have.>10%.canopy.cover..If.shrub.cover.is.more.than.tree.cover,.go.to.Key.D:.Shrubs. 

29a.. 

29b... 

30a.. 

30b.. 

.Juniperus monosperma.dominates.the.tree.species..Juniperus monosperma.is.a.short.tree. 

that.tends.to.have.a.tall.shrub-like.appearance.and.occurs.in.low.density..Artemisia bigelovii.typically.occurs.as.an.indicator.species.in.the.understory.of.this.map.class..Occasionally. 

Artemisia bigelovii.dominates.the.understory,.but.it.does.not.have.to.occur..The.understory. 

typically.consists.of.a.sparse.cover.of.shrub.and.herbaceous.species. 

•. Base.map.class:.One-seed.Juniper./.Bigelow’s.Sagebrush.Shrubland 

•. Group.map.class:.Colorado.Plateau.Pinyon-Juniper.Woodland 

•. Management.map.class:.One-seed.Juniper./.Bigelow’s.Sagebrush.Shrubland 

•. Association:.Juniperus monosperma./.Artemisia bigelovii.Woodland 

Tree.species.not.as.above..(30a) 

.Tree.species.are.dominated.by.Pinus edulis.and/or.Juniperus osteosperma..Both.of.these.tree. 

species.occur.in.low.densities..The.understory.tends.to.have.a.low.cover.of.herbaceous.and. 

shrub.species..The.herbaceous.cover.often.consists.of.a.low.to.moderate.cover.of.Bouteloua 

gracilis..This.map.class.is.restricted.to.the.higher.elevations.of.the.northern.half.of.the.project.boundary.. 

•. Association:.Pinus edulis.-.(Juniperus osteosperma)./.Bouteloua gracilis.Woodland 

.Populus fremontii.is.the.dominant.tree.species..Ericameria nauseosa.commonly.occurs.as.a. 

tall.shrub.in.the.understory..This.community.is.restricted.to.areas.with.intermittent.stream. 

flow.and.mostly.commonly.occurs.along.the.banks.of.the.Puerco.River. 

•. Base.map.class:.Cottonwood./.Rubber.Rabbitbrush.Woodland 

•. Group.map.class:.Inter-Mountain.Basins.Riparian.Woodland.and.Shrubland 

•. Management.map.class:.Cottonwood./.Rubber.Rabbitbrush.Woodland 

•. Association:.Populus fremontii./.Ericameria nauseosa.Woodland 

Key D: Shrublands 

Shrubs.are.the.dominant.lifeform..Total.vegetation.cover.is.generally.>10%.cover;.in.particularly.dry. 

sites.vegetation.cover.can.be.as.low.as.2%.cover..Tree.cover.is.less.than.the.total.shrub.cover.and. 


31a.. 

31b.. 

32a.. 

32b.. 

33a.. 

33b.. 

34a.. 

34b.. 

35a.. 

35b.. 

36a.. 

36b.. 

37a.. 

37b.. 

.A.mix.of.shrub.species.occurring.on.a.mesa.rim.or.on/near.a.wash..First.go.to.32a.and.try.to. 

select.the.appropriate.map.class..If.none.of.the.map.classes.work,.proceed.to.56a. 

Shrub.species.not.as.above..(32a) 

.Artemisia bigelovii.and/or.Ephedra torreyana.are.either.dominant.or.co-dominant.shrubs.. 

This.map.class.occurs.throughout.the.mapping.area.and.more.commonly.occurs.on.or.near. 

sandstone..If.Purshia stansburiana.is.also.present.with.2%.cover,.go.to.42a. 

•. Base.map.class:.-.Torrey’s.Jointfir.-.Bigelow’s.Sagebrush.Sparse.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Semi-Desert.Shrub-Steppe 

•. Management.map.class:.Vegetated.Rim.Complex 

•. Association:.Ephedra torreyana.-.Artemisia bigelovii.Sparse.Vegetation 

Dominant.shrub.species.not.as.above..(33a) 

Artemisia filifolia.is.the.dominant.shrub.species..(34a). 


.Artemisia filifolia.is.the.dominant.shrub.species..The.understory.is.a.mix.of.shrub.and.herbaceous.species..This.map.class.occurs.commonly.throughout.the.park,.typically.on.sandy.soils. 

or.sand.dunes. 

•. Base.map.class:.Sandsage.Colorado.Plateau.Shrubland 

•. Group.map.class:.Southern.Colorado.Plateau.Sand.Shrubland 

•. Management.map.class:.Sandsage.-.Fourwing.Saltbush.Colorado.Plateau.Shrubland 

•. Association:.Artemisia filifolia.Colorado.Plateau.Shrubland 

.Artemisia filifolia.is.the.dominant.shrub.species..The.understory.is.dominated.by.the.native. 

grass.Bouteloua eriopoda..This.map.class.is.restricted.to.a.few.areas.in.the.park..Where.it. 

occurred,.it.was.mapped.as.part.of.the.polygon.describing.the.vegetation.surrounding.it. 

•. Association:.Artemisia filifolia./.Bouteloua eriopoda.Shrubland 

.Atriplex canescens.is.the.dominant.shrub..Other.shrub.species.can.also.be.present,.such.as. 

Ericameria nauseosa,.Gutierrezia sarothrae,.and.Artemisia bigelovii..The.understory.consists. 

of.a.mix.of.native.grasses..Pleuraphis jamesii often.occurs.in.the.understory,.but.does.not. 

have.to.occur..Bouteloua gracilis.and.Sporobolus airoides.are.also.common.grasses.in.the.understory..This.map.class.occurs.throughout.the.project.boundary.and.on.various.substrates,. 

ranging.from.clay.to.sandy.soils.and.sand.dunes.. 

•. Base.map.class:.Four-wing.Saltbush./.Galleta.Shrubland 

•. Group.map.class:.Southern.Colorado.Plateau.Sand.Shrubland 

•. Management.map.class:.Sandsage.-.Fourwing.Saltbush.Colorado.Plateau.Shrubland 

•. Association:.Atriplex canescens./.Pleuraphis jamesii Shrubland 


Ericameria nauseosa.is.the.dominant.shrub.species..(37a) 


.Ericameria nauseosa.is.the.dominant.shrub.species.and.occurs.as.a.tall.shrub.(generally.at. 

least.1m.tall)..The.shrubs.often.occur.in.large.patches.along.the.banks.of.washes.and.rivers. 

•. Base.map.class:.Rubber.Rabbitbrush.Desert.Wash.Shrubland 



•. Association:.Ericameria nauseosa.Desert.Wash.Shrubland 

.Ericameria nauseosa.is.the.dominant.shrub.and.it.typically.has.a.short-statured.growth.form. 

(generally.less.than.1m.tall)..The.understory.can.consist.of.other.shrub.and.herbaceous.species..component..This.map.class.occurs.on.a.variety.of.upland.environments,.including.sand. 

dune.and.mesa.tops.. 

•. Base.map.class:.Rubber.Rabbitbrush./.Blue.Grama.Shrub.Herbaceous.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Active.and.Stabilized.Dune 


•. Association:.Ericameria nauseosa./.Bouteloua gracilis.Shrub.Herbaceous.Vegetation 

E8


38a.. 

38b.. 

39a.. 

39b.. 

.Atriplex obovata.is.the.dominant.shrub.species..(39a).If.Sarcobatus vermiculatus.is.also.present.with.>.2%.cover,.go.to.47a. 


.Atriplex obovata.is.the.dominant.shrub..The.understory.tends.to.be.very.sparse..Occasional. 

shrub.and.grass.species.may.occur,.but.never.with.more.cover.than.Atriplex obovata..This. 

map.class.typically.occurs.in.badland.areas.with.very.low.cover. 

•. 

•. 

•. 

•. 

Base.map.class:.New.Mexico.Saltbush.Badland.Sparse.Vegetation 

Group.map.class:.Inter-Mountain.Basins.Semi-Desert.Shrub-Steppe 

Management.map.class:.Badland.Sparse.Vegetation 

Association:.Atriplex obovata.Badland.Sparse.Vegetation 

.Atriplex obovata.is.the.dominant.shrub..The.understory.has.a.low.to.moderate.cover.of.native.grasses..The.native.grasses.often.consist.of.Pleuraphis 

jamesii and.Sporobolus airoides.. 

This.map.class.typically.occurs.on.clay.badland.soils.. 

•. 

•. 

•. 

•. 

.Base.map.class:.New.Mexico.Saltbush./.Alkali.Sacaton.–.Galleta.Shrub.Herbaceous.Vegetation 

Group.map.class:.Inter-Mountain.Basins.Semi-Desert.Shrub-Steppe 

Management.map.class:.Alkali.Sacaton.Steppe.and.Mixed.Grasslands 

.Association:.Atriplex obovata./.Sporobolus airoides.-.Pleuraphis jamesii Shrub.Herbaceous.Vegetation 

40a.. 

40b.. 

41a.. 

41b.. 

42a.. 

42b.. 

43a.. 

43b.. 

44a.. 

Krascheninnikovia lanata.is.the.dominant.shrub..(41a) 


.Krascheninnikovia lanata.is.the.main.shrub.with.no.other.shrubs.occurring.or.with.a.very. 

low.shrub.cover..Where.it.occurred,.it.was.mapped.as.part.of.the.polygon.describing.the. 

vegetation.surrounding.it. 

•. Association:.Krascheninnikovia lanata.Dwarf-shrubland. 

.The.understory.consists.of.a.mix.of.native.grasses..Often.Bouteloua gracilis.occurs.as.one.of. 

the.dominant.grass.species..Other.shrub.species.can.occur,.such.as.Gutierrezia sarothrae. 

•. Base.map.class:.Winter-fat./.Blue.Grama.Dwarf-shrubland 

•. Group.map.class:.Inter-Mountain.Basins.Semi-Desert.Shrub-Steppe 

•. 

•. 

Management.map.class:.Blue.Grama.Steppe.and.Mixed.Grasslands 

.Association:.Krascheninnikovia lanata./.Bouteloua gracilis.Dwarf-shrub.Herbaceous. 


.Purshia stansburiana.is.the.dominant.tall.shrub..The.understory.tends.to.have.a.mix.of.herbaceous.species.and.smaller.shrubs,.often.including.Artemisia 

bigelovi..Eriogonum corymbosum.typically.occurs.as.an.indicator.sub-shrub.for.this.map.class..This.map.class.is.restricted. 

to.the.higher.elevations.of.the.park.and.environs,.and.typically.occurs.on.the.basaltic.soils.of. 

Headquarter’s.Mesa. 

•. Base.map.class:.Cliff-rose.-.Crispleaf.Buckwheat.Shrubland 

•. Group.map.class:.Colorado.Plateau.Mixed.Bedrock.and.Tableland 

•. Management.map.class:.Cliff-rose.-.Crispleaf.Buckwheat.Shrubland 

•. Association:.Purshia stansburiana.-.Eriogonum corymbosum.Shrubland 

The.dominant.shrub.is.not.Purshia stansburiana..(43a) 

.Isocoma drummondii.is.the.dominant.shrub..The.understory.has.an.herbaceous.component. 

that.can.include.Pleuraphis jamesii..This.map.class.is.restricted.to.a.few.areas.in.the.park.and. 

environs. 

•. Base.map.class:.Drummond.Goldenweed.-.Galleta.Shrubland 



•. Association:.Isocoma drummondii.-.Pleuraphis jamesii Shrubland.[Park.Special] 

The.dominant.shrub.is.not.Isocoma drummondii..(44a) 

.Iva acerosa,.a.tall.suffrutescent.shrub,.is.the.dominant.species..The.herbaceous.layer.is.domi- 

E9


44b.. 

45a.. 

45b.. 

46a.. 

46b.. 

47a.. 

47b.. 

48a.. 

48b.. 

49a.. 

49b.. 

50a.. 

50b.. 

51a.. 

nated.by.Sporobolus airoides..This.map.class.is.restricted.to.a.few.areas.in.northern.part.of. 

the.park.and.environs.in.washes.and.areas.with.seasonal.stream.flow. 

•. Base.map.class:.Copperweed.-.Alkali.Sacaton.Shrubland 



•. Association:.Iva acerosa.-.Sporobolus airoides.Shrubland.[Park.Special] 

The.dominant.shrub.is.not.Iva acerosa..(45a) 

.Allenrolfea occidentalis.is.the.dominant.shrub..The.understory.tends.to.be.sparse..This.map. 

class.typically.occurs.on.saline.or.alkaline.soils.in.areas.with.periodic.sheet.flow. 

•. Base.map.class:.Iodine.Bush.Shrubland 

•. Group.map.class:.Inter-Mountain.Basins.Greasewood.Flat 

•. Management.map.class:.Greasewood.Flats 

•. Association:.Allenrolfea occidentalis.Shrubland 

The.dominant.shrub.not.as.above..(46a) 

Sarcobatus vermiculatus.is.the.dominant.or.co-dominant.shrub..(47a) 

The.dominant.shrub.is.not.Sarcobatus vermiculatus..(48a) 

. Sarcobatus vermiculatus.is.co-dominant.with.the.native.dwarf-shrub.Atriplex obovata..This. 

map.class.generally.occurs.on.saline.and.alkaline.soils.and.in.areas.with.periodic.sheet.flow,. 

often.near.a.wash.system. 

•. Base.map.class:.Greasewood./.New.Mexico.Saltbush.Shrubland 



•. Association:.Sarcobatus vermiculatus./.Atriplex obovata.Shrubland 

. Sarcobatus vermiculatus.is.the.dominant.tall.shrub.and.the.native.suffrutescent.shrub.Suaeda 

moquinii.is.the.dominant.species.in.the.understory..This.map.class.is.generally.restricted. 

to.the.alkaline.soils.around.the.Puerco.River.corridor. 

•. Base.map.class:.Greasewood./.Shrubby.Seepweed.Shrubland 



•. Association:.Sarcobatus vermiculatus./.Suaeda moquinii.Shrubland 

. Suaeda moquinii,.a.suffrutescent.shrub,.is.the.dominant.species..This.map.class.is.generally. 

restricted.to.the.alkaline.soils.around.the.Puerco.River.corridor..Where.it.occurred,.it.was. 

mapped.as.part.of.the.polygon.describing.the.vegetation.surrounding.it. 

•. Association:.Suaeda moquinii.Shrubland 

The.dominant.shrub.is.not.as.above..(49a) 

.Either.Ephedra viridis.or.Rhus trilobata.is.the.dominant.shrub,.or.they.are.co-dominant..This. 

map.class.tends.to.occur.on.sparse.talus.slopes.or.on.rocky.outcrops. 

•. Base.map.class:.Three-leafed.Sumac.-.Mormon.Tea.Talus.Shrubland 


•. Management.map.class:.Vegetated.Rim.Complex 

•. Association:.Rhus trilobata.-.Ephedra.(viridis,.torreyana).Talus.Shrubland 

The.dominant.shrub(s).are.not.as.above..(50a) 

.Zuckia brandegeei.is.the.dominant.species..This.map.class.tends.to.occur.in.very.sparse.areas. 

on.clay.badland.soils..Other.shrub.and.herbaceous.species.may.occur,.but.never.with.high. 

cover.and.never.as.the.dominant.species. 

•. Base.map.class:.Arizona.Siltbush.Sparse.Vegetation 

•. Group.map.class:.Inter-Mountain.Basins.Shale.Badland 

•. Management.map.class:.Badland.Sparse.Vegetation 

•. Association:.Zuckia brandegeei.Sparse.Vegetation 

The.dominant.shrub.not.as.above..(51a) 

.Eriogonum leptophyllum.is.the.dominant.species.or.is.an.indicator.species.in.very.sparsely. 

E10


51b.. 

vegetated.areas..Other.shrub.species.that.tend.to.occur.in.this.map.class.include.Atriplex 

confertifolia,.Artemisia bigelovii,.and.Gutierrezia sarothrae..This.map.class.tends.to.occur.in. 

sparse.areas.on.whitish.clay.badland.soils. 

•. Base.Map.Class:.Slender.Buckwheat.Sparse.Vegetation 

•. Group.Map.Class:.Inter-Mountain.Basins.Shale.Badland 

•. Management.Map.Class:.Vegetated.Rim.Complex 

•. Association:.Eriogonum leptophyllum.Sparse.Vegetation 

The.dominant.shrub.species.not.as.above..(52a) 

52a.. 

52b.. 

53a.. 

53b.. 

54a.. 

54b.. 

55a.. 

55b.. 

56a.. 

.Salvia pachyphylla.is.the.dominant.shrub.species..The.understory.tends.to.be.sparse..This. 

map.class.is.restricted.to.the.higher.elevations.of.the.northern.half.of.the.project.boundary. 

near.Chinde.Mesa. 

•. Base.map.class:.Blue.Sage.Dwarf-shrubland 

•. Group.map.class:.Inter-Mountain.Basins.Shale.Badland 

•. Management.map.class:.Blue.Sage.Dwarf-shrubland 

•. Association:.Salvia pachyphylla.Dwarf-shrubland.[Park.Special] 


.Forestiera pubescens.is.the.dominant.shrub..This.species.tends.to.grow.in.large.dense. 

patches..This.map.class.is.isolated.to.a.few.small.patches.near.the.Puerco.River.. 

•. Association:.Forestiera pubescens.Temporarily.Flooded.Shrubland.Alliance 


.Salix exigua.is.the.dominant.shrub.species..Other.shrub.species.may.occur,.including.Ericameria 

nauseosa.and.Isocoma drummondii..The.understory.tends.to.have.a.sparse.herbaceous. 

layer..This.map.class.is.restricted.to.areas.with.periodic.stream.flow.and.is.most.common.in. 

the.Puerco.River.corridor. 

•. Base.map.class:.Coyote.Willow.Shrubland 


•. Management.map.class:.Coyote.Willow.Shrubland 

•. Association:.Salix exigua./.Barren.Shrubland 


.Tamarix.sp..dominates.the.shrub.layer..This.species.often.occurs.as.a.tall.shrub.or.a.short.tree. 

and.forms.dense.monocultures..This.community.generally.occurs.in.riparian.areas.or.in.areas. 

with.a.high.water.table,.such.as.in.washes.or.near.stock.tanks. 

•. Base.map.class:.Tamarisk.Shrubland 



•. Association:.Tamarix.spp..Semi-Natural.Temporarily.Flooded.Shrubland 

.Gutierrezia sarothrae.is.the.dominant.species.and.no.other.shrub.species.has.even.a.low.cover.in.this.map.class..A.very.low.cover.of.Opuntia.spp..can.occasionally.occur..The.herbaceous. 

layer.is.often.present,.but.does.not.have.to.occur,.with.a.low.cover.of.the.grass.Pleuraphis 

jamesii. 

•. Base.map.class:.Snakeweed.-.(Prickly.Pear)./.Galleta.Dwarf-shrubland 

•. .Association:.Gutierrezia sarothrae.-.(Opuntia.spp.).-.Pleuraphis jamesii Dwarf-shrubland 

.None.of.the.individual.associations.included.in.the.key.above.define.this.map.class..This.map. 

class.is.distinguished.by.its.landform.characteristic.and.occurs.on.mesa.rims..A.wide.range. 

of.herbaceous.and.shrub.species.can.occur.in.this.habitat..No.one.individual.association.was. 

determined.to.represent.this.map.class.which.contains.a.complex.of.associations.and.unique. 

communities..Associations.that.can.occur.in.this.complex.include,.but.are.not.limited.to,.Juniperus 

monosperma./.Artemisia bigelovii.Woodland,.Artemisia bigelovii.-.Ephedra torreyana.Shrubland,.and.Ephedra 

viridis.-.Rhus trilobata.Talus.Shrubland..This.map.class.contains.a. 

mix.of.species.and.associations.and.was.defined.as.a.heterogeneous.group.of.associations.. 

•. Base.map.class:.Vegetated.Rim.Complex 


•. Management.map.class:.Vegetated.Rim.Complex. 

E11


56b.. 

•. 


.None.of.the.individual.associations.included.in.the.key.above.define.this.map.class..It. 

contains.a.mix.of.herbaceous.and.shrub.species.and.is.distinguished.by.its.landform.characteristic..It.occurs.in.areas.of.intermittent.flooding,.such.as.in.washes,.along.wash.banks,. 

and.on.wash.terraces..No.one.individual.association.represents.this.map.class.as.it.contains.a. 

complex.of.associations.and.unique.communities..Associations.that.can.occur.in.this.complex. 

include,.but.are.not.limited.to,.Allenrolfea occidentalis.Shrubland,.Calamovilfa gigantea. 

Desert.Wash.Shrub.Herbaceous.Vegetation,.Ericameria nauseosa.Desert.Wash.Shrubland,. 

Ericameria nauseosa./.Bouteloua gracilis.Shrub.Herbaceous.Vegetation,.Isocoma drummondii. 

/.Pleuraphis jamesii Shrubland,.Salix exigua./.Barren.Shrubland,.Sarcobatus vermiculatus./. 

Atriplex obovata.Shrubland,.Sarcobatus vermiculatus./.Suaeda moquinii.Shrubland,.Suaeda 

moquinii.Shrubland,.Tamarix.spp..Semi-Natural.Temporarily.Flooded.Shrubland..This.map. 

class.contains.a.mix.of.species.and.associations.and.was.defined.as.a.heterogeneous.group. 

of.associations.. 

•. Base.Map.Class:.Vegetated.Wash.Complex 

•. Group.Map.Class:.Inter-Mountain.Basins.Wash 

•. Management.Map.Class:.Vegetated.Wash.Complex. 

•. Association:.NA 

. 

E12

Appendix F 

Plant community and map class crosswalk 

This table provides a crosswalk between the plant communities of Petrified Forest National 

Park (associations, alliances, and park species) and their base, group, management, and 

macrogroup map class assignments. Each plant community is in only one map class for each 

schema, but each map class may contain more than one plant community. 

F1

F2 

Appendix F 

Plant community (associations and 

park specials) Base map class Group map class Macrogroup map class Management map class 

WOODLAND . . . . 

1 Juniperus monosperma./.Artemisia B2 One-seed.Juniper./. G3 Colorado.Plateau. MG3 Colorado.Plateau.Pin- MN12 One-seed.Juniper./.Bigbigelovii.Woodland 

Bigelow’s.Sagebrush. Pinyon-Juniper.Wood- yon-Juniper.Woodland elow’s.Sagebrush.Shru- 

Shrubland land bland 

2 Pinus edulis.-.(Juniperus osteosper- B2 One-seed.Juniper./. G3 Colorado.Plateau. MG3 Colorado.Plateau.Pin- MN12 One-seed.Juniper./.Bigma)./.Bouteloua 

gracilis.Woodland Bigelow’s.Sagebrush. Pinyon-Juniper.Wood- yon-Juniper.Woodland elow’s.Sagebrush.Shru- 

Shrubland land bland 

3 Populus fremontii./.Ericameria B1 Cottonwood./.Rubber. G7 Inter-Mountain.Basins. MG7 Inter-Mountain.Basins. MN9 Cottonwood./.Rubber.Rabnauseosa.Woodland 

Rabbitbrush.Woodland Riparian.Woodland.and. Riparian.Woodland.and. bitbrush.Woodland 



SHRUBLAND . . MG6 . . 

4 Allenrolfea occidentalis.Shrubland. B11 Iodine.Bush.Shrubland G6 Inter-Mountain.Basins. Inter-Mountain.Basins. MN11 Greasewood.Flats 

Greasewood.Flat 

Greasewood.Flat 

5 Artemisia filifolia./.Bouteloua Mapped.with.Sand- NA NA NA 

eriopoda.Shrubland 

sage.Colorado.Plateau. 

Shrubland.and.Torrey’s. 

Jointfir.-.Bigelow’s. 

Sagebrush.Shrubland 

6 Artemisia filifolia.Colorado.Pla- B13 Sandsage.Colorado. G14 Southern.Colorado.Pla- MG12 Southern.Colorado.Pla- MN21 Sandsage.-.Fourwing. 

teau.Shrubland Plateau.Shrubland teau.Sand.Shrubland teau.Sand.Shrubland Saltbush.Colorado.Plateau. 


7 Atriplex canescens./.Pleuraphis B8 Four-wing.Saltbush./. G14 Southern.Colorado.Pla- MG12 Southern.Colorado.Pla- MN21 Sandsage.-.Fourwing. 

jamesii.Shrubland Galleta.Shrubland teau.Sand.Shrubland teau.Sand.Shrubland Saltbush.Colorado.Plateau. 


8 Ericameria nauseosa.Desert.Wash. B12 Rubber.Rabbitbrush. G8 Inter-Mountain.Basins. MG9 Inter-Mountain.Basins. MN24 Vegetated.Wash.Complex 

Shrubland Desert.Wash.Shrubland Wash Wash 

9 Forestiera pubescens.Shrubland Not.mapped.as.unique. NA NA NA 

base.map.class 

10 Gutierrezia sarothrae.-.(Opuntia. B14 Snakeweed.-.(Prickly. G10 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Alkali.Sacaton.Steppe.and. 

spp.)./.Pleuraphis jamesii.Dwarf- Pear)./.Galleta.Dwarf- Semi-Desert.Shrub- Semi-Desert.Grassland. Mixed.Grasslands 

shrubland shrubland Steppe and.Steppe 

11 Isocoma drummondii.-.Pleuraphis B7 Drummond.Golden- G8 Inter-Mountain.Basins. MG9 Inter-Mountain.Basins. MN24 Vegetated.Wash.Complex 

jamesii.Shrubland weed.-.Galleta.Shru- Wash Wash 


12 Iva acerosa.-.Sporobolus airoides. 


13 Krascheninnikovia lanata./.Bouteloua 

gracilis.Dwarf-shrub.Herbaceous.Vegetation 

14 Krascheninnikovia lanata.Dwarfshrubland 

B5 Copperweed.-.Alkali. 

Sacaton.Shrubland 

B17 Winter-fat./.Blue.Grama. 


Not.mapped.as.unique. 


G8 Inter-Mountain.Basins. 

Wash 

G10 Inter-Mountain.Basins. 

Semi-Desert.Shrub- 

Steppe 

NA 

MG9 

MG8 

Inter-Mountain.Basins. 

Wash 


Semi-Desert.Grassland. 

and.Steppe 

NA 

MN24 Vegetated.Wash.Complex 

MN5 

Blue.Grama.Steppe.and. 

Mixed.Grasslands 

. 


F3 

Appendix F continued 



15 Purshia stansburiana.-.Eriogonum B4 Cliff-rose.-.Crispleaf. G2 Colorado.Plateau. MG2 Colorado.Plateau.Mixed. MN7 Cliff-rose.-.Crispleaf.Buckcorymbosum.Shrubland 

Buckwheat.Shrubland Mixed.Bedrock.and. Bedrock.and.Tableland wheat.Shrubland 

Tableland 

16 Rhus trilobata.-.Ephedra.(viridis,. B16 Three-leafed.Sumac. G2 Colorado.Plateau. MG2 Colorado.Plateau.Mixed. MN23 Vegetated.Rim.Complex 

torreyana).Talus.Shrubland. -.Mormon.Tea.Talus. Mixed.Bedrock.and. Bedrock.and.Tableland 



17 Salix exigua./.Barren.Shrubland B6 Coyote.Willow..Shru- G7 Inter-Mountain.Basins. MG7 Inter-Mountain.Basins. MN10 Coyote.Willow.Shrubland 

bland Riparian.Woodland.and. Riparian.Woodland.and. 



18 Salvia pachyphylla.Dwarf-shru- B3 Blue.Sage.Dwarf-shru- G11 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN6 Blue.Sage.Dwarf-shrubland 

bland Shale.Badland Semi-Desert.Grassland. bland 


19 Sarcobatus vermiculatus./.Atriplex B9 Greasewood./.New. G6 Inter-Mountain.Basins. MG6 Inter-Mountain.Basins. MN11 Greasewood.Flats 

obovata.Shrubland Mexico.Saltbush.Shru- Greasewood.Flat Greasewood.Flat 


20 Sarcobatus vermiculatus./.Suaeda B10 Greasewood./.Shrubby. G6 Inter-Mountain.Basins. MG6 Inter-Mountain.Basins. MN11 Greasewood.Flats 

moquinii.Shrubland Seepweed.Shrubland Greasewood.Flat Greasewood.Flat 

21 Suaeda moquinii.Shrubland Not.mapped.as.unique. NA NA NA 


22 Tamarix.spp..Temporarily.Flooded. B15 Tamarisk.Shrubland G7 Inter-Mountain.Basins. MG7 Inter-Mountain.Basins. MN24 Vegetated.Wash.Complex 

Semi-natural.Shrubland Riparian.Woodland.and. Riparian.Woodland.and. 



HERBACEOUS . . . 

23 Atriplex obovata./.Sporobolus B25 New.Mexico.Saltbush./. G10 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Alkali.Sacaton.Steppe.and. 

Shrub.Herbaceous.Veg- Steppe and.Steppe 


airoides.-.Pleuraphis jamesii.Shrub. Alkali.Sacaton.-.Galleta. Semi-Desert.Shrub- Semi-Desert.Grassland. 


24 Bouteloua eriopoda.-.Pleuraphis 


25 Bouteloua gracilis.-.Pleuraphis 


26 Bouteloua gracilis.Herbaceous. 


27 Calamovilfa gigantea.Desert.Wash. 

Shrub.Herbaceous.Vegetation 

28 Ericameria nauseosa./.Bouteloua 

gracilis.Shrub.Herbaceous.Vegetation 

etation 

B20 Black.Grama.-.Galleta. 


B22 Blue.Grama.-.Galleta. 


B21 Blue.Grama.Herbaceous. 


B24 Giant.Sandreed.Desert. 

Wash.Shrub.Herbaceous.Vegetation 

B26 Rubber.Rabbitbrush./. 

Blue.Grama.Shrub.Herbaceous.Vegetation 

G9 

G9 

G9 

G8 

G5 


Semi-Desert.Grassland 






Wash 


Active.and.Stabilized. 

Dune 

MG8 

MG8 

MG8 

MG9 

MG5 











Wash 


Active.and.Stabilized. 

Dune 

MN2 

MN5 

MN5 

Alkali.Sacaton.Steppe.and. 






MN24 .Vegetated.Wash.Complex 

MN2 



Appendix F: Plant community and map class crosswalk

F4 




G9 

MG8 

MN2 

29 Opuntia.whipplei.-.Sporobolus 

airoides.Shrub.Herbaceous.Vegetation 

B28 Whipple.Cholla.-.Alkali. 

Sacaton.Shrub.Herbaceous.Vegetation 








30 Pleuraphis jamesii.-.Sporobolus B23 Galleta.-.Alkali.Sacaton. G9 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Alkali.Sacaton.Steppe.and. 

airoides.Herbaceous.Vegetation Herbaceous.Vegetation Semi-Desert.Grassland Semi-Desert.Grassland. Mixed.Grasslands 


31 Salsola tragus.Sand.Dune.Vegeta- B27 Russian.Thistle.Sand. G5 Inter-Mountain.Basins. MG5 Inter-Mountain.Basins. MN19 Russian.Thistle.Sand.Dune. 

tion Dune.Vegetation Active.and.Stabilized. Active.and.Stabilized. Vegetation 

Dune 

Dune 

32 Sporobolus airoides.-.Bouteloua B19 Alkali.Sacaton.-.Blue. G9 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Alkali.Sacaton.Steppe.and. 

gracilis.Herbaceous.Vegetation Grama.Herbaceous. Semi-Desert.Grassland Semi-Desert.Grassland. Mixed.Grasslands 



33 Sporobolus airoides.Southern. B18 Alkali.Sacaton..Herba- G9 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Alkali.Sacaton.Steppe.and. 

Plains.Herbaceous.Vegetation. ceous.Vegetation Semi-Desert.Grassland Semi-Desert.Grassland. Mixed.Grasslands 


34 Sporobolus coromandelianus.Her- Not.mapped.as.unique. NA NA NA 

baceous.Vegetation 


35 Sporobolus cryptandrus.Great. Not.mapped.as.unique. NA NA NA 

Basin.Herbaceous.Vegetation 


SPARSE . . . . 

36 Atriplex obovata.Badland.Sparse. B30 New.Mexico.Saltbush. G10 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN3 Badland.Sparse.Vegetation 

Vegetation Badland.Sparse.Vegeta- Semi-Desert.Shrub- Semi-Desert.Grassland. 

tion Steppe and.Steppe 

37 Ephedra.torreyana.-.Artemisia B32 Torrey’s.Jointfir.-. G10 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN23 Vegetated.Rim.Complex 

bigelovii.Sparse.Vegetation Bigelow’s.Sagebrush. Semi-Desert.Shrub- Semi-Desert.Grassland. 

Sparse.Vegetation Steppe and.Steppe 

38 Eriogonum leptophyllum.Sparse. B31 Slender.Buckwheat. G11 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN23 Vegetated.Rim.Complex 

Vegetation Sparse.Vegetation Shale.Badland Semi-Desert.Grassland. 


39 Zuckia brandegeei..Sparse.Vegeta- B29 Arizona.Siltbush.Sparse. G11 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN3 Badland.Sparse.Vegetation 

tion Vegetation Shale.Badland Semi-Desert.Grassland. 


Land.cover/Land.use.type.without. B33 Airstrip G15 Transportation MG13 Transportation MN1 Airstrip 

a.plant.community.assignment 

Land.cover/Land.use.type.without. B34 Barren.Badlands G11 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN2 Badland.Sparse.Vegetation 

a.plant.community.assignment Shale.Badland Semi-Desert.Grassland. 


Land.cover/Land.use.type.without. B35 Barren.Wash G8 Inter-Mountain.Basins. MG9 Inter-Mountain.Basins. MN4 Barren.Wash 

a.plant.community.assignment Wash Wash 

Land.cover/Land.use.type.without. B36 Park.Facilities G12 Park.Facilities MG10 Park.Facilities MN13 Park.Facilities 


Land.cover/Land.use.type.without. B37 Park.Sites G12 Park.Facilities MG10 Park.Facilities MN14 Park.Sites 






Land.cover/Land.use.type.without. B38 Railroad G15 Transportation MG13 Transportation MN15 Railroad 


Land.cover/Land.use.type.without. B39 Residences G13 Residential MG10 Park.Facilities MN13 Park.Facilities 


Land.cover/Land.use.type.without. B40 Roads G15 Transportation MG13 Transportation MN16 Residences 


Land.cover/Land.use.type.without. B41 Run-off.Control.Feature G1 Agriculture MG1 Agriculture MN18 Run-off.Control.Feature 


Land.cover/Land.use.type.without. B42 Sand G11 Inter-Mountain.Basins. MG8 Inter-Mountain.Basins. MN20 Sand./.Mudflat 

a.plant.community.assignment Shale.Badland Semi-Desert.Grassland. 


Land.cover/Land.use.type.without. B43 Stock.Ponds G1 Agriculture MG1 Agriculture MN22 Stock.Ponds 


Land.cover/Land.use.type.without. B44 Vegetated.Rim.Complex G2 Colorado.Plateau. MG2 Colorado.Plateau.Mixed. MN23 Vegetated.Rim.Complex 

a.plant.community.assignment Mixed.Bedrock.and. Bedrock.and.Tableland 


Land.cover/Land.use.type.without. B45 Vegetated.Wash.Com- G8 Inter-Mountain.Basins. MG9 Inter-Mountain.Basins. MN24 Vegetated.Wash.Complex 

a.plant.community.assignment plex Wash Wash 

Land.cover/Land.use.type.without. B46 Commercial.Develop- G4 Development MG4 Development MN8 Commercial.Development 

a.plant.community.assignment ment 

Appendix F: Plant community and map class crosswalk 

F5

Appendix G 

Map.Class.Summaries 

These map class summaries provide statistics for each base map class, list the group and management 

classes for each base map class, and show accuracy results for all four map class levels. The 

photointerpreter provided examples of the base map-class photosignature and commented on the 

aerial photo interpretation of the base map class. The gray toned aerial photography views are from 

panchromatic imagery, and the colored views are from the 2003/04 1:6,000 true color imagery. Field 

photographs and photosignature images appear to the left of the summaries. 

G1


B 1.Cottonwood./.Rubber.Rabbitbrush.Woodland..............................................................G.4 

B 2.One-seed.Juniper./.Bigelow’s.Sagebrush.Shrubland......................................................G 

5 

B 3..Blue.Sage.Dwarf-Shrubland...........................................................................................G.6 

B 4..Cliff-rose.-.Crispleaf.Buckwheat.Shrubland...................................................................G7 

B 5..Copperweed.-.Alkali.Sacaton.Shrubland.......................................................................G8 

B 6..Coyote.Willow.Shrubland...............................................................................................G9 

B 7..Drummond.Goldenweed.-.Galleta.Shrubland.............................................................G 

10 

B 8..Four-wing.Saltbush./.Galleta.Shrubland.......................................................................G11 

B 9..Greasewood./.New.Mexico.Saltbush.Shrubland..........................................................G12 

B 10.Greasewood./.Shrubby.Seepweed.Shrubland.............................................................G13 

B 11.Iodine.Bush.Shrubland..................................................................................................G14 

B 12.Rubber.Rabbitbrush.Desert.Wash.Shrubland..............................................................G 

15 

B 13.Sandsage.Colorado.Plateau.Shrubland.......................................................................G16 

B 14.Snakeweed.-.(Prickly.Pear)./.Galleta.Dwarf-shrubland...............................................G17 

B 15.Tamarisk.Shrubland......................................................................................................G18 

B 16.Three-leafed.Sumac.-.Mormon.Tea.Talus.Shrubland..................................................G19 

B 17..Winter-fat./.Blue.Grama.Dwarf-shrubland.................................................................G 

20 

B 18.Alkali.Sacaton.Herbaceous.Vegetation.......................................................................G21 

B 19.Alkali.Sacaton.-.Blue.Grama.Herbaceous.Vegetation................................................G22 

B 20.Black.Grama.-.Galleta.Herbaceous.Vegetation...........................................................G23 

B 21.Blue.Grama.Herbaceous.Vegetation...........................................................................G24 

B 22.Blue.Grama.-.Galleta.Herbaceous.Vegetation............................................................G 

25 

B 23.Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation........................................................G26 

B 24.Giant.Sandreed.Desert.Wash.Shrub.Herbaceous.Vegetation....................................G27 

B 25.New.Mexico.Saltbush./.Alkali.Sacaton.–.Galleta.Shrub.Herbaceous.Vegetation.....G28 

B 26..Rubber.Rabbitbrush./.Blue.Grama.Shrub.Herbaceous.Vegetation...........................G29 

B 27.Russian.Thistle.Sand.Dune.Vegetation........................................................................G 

30 

B 28.Whipple.Cholla.-.Alkali.Sacaton.Shrub.Herbaceous.Vegetation...............................G31 

B 29.Arizona.Siltbush.Sparse.Vegetation............................................................................G32 

B 30.New.Mexico.Saltbush.Badland.Sparse.Vegetation.....................................................G33 

B 31.Slender.Buckwheat.Sparse.Vegetation........................................................................G34 

B 32.Torrey’s.Jointfir.–.Bigelow’s.Sagebrush.Sparse.Vegetation........................................G 

35 

B 33.Airstrip.......................................................................................................................... G36 

B 34.Barren.Badlands............................................................................................................G37 

B 35.Barren.Wash..................................................................................................................G38 

G2

Appendix G: Map Class summaries 

B36.Park.Facilities.........................................................................................................G39 

B37.Park.Sites.................................................................................................................G40 

B38.Railroad..................................................................................................................G41 

B39.Residences..............................................................................................................G42 

B40.Roads......................................................................................................................G43 

B41.Run-off.Control.Feature........................................................................................G44 

B42.Sand........................................................................................................................G45 

B43.Stock.Ponds............................................................................................................G46 

B44.Vegetated.Rim.Complex........................................................................................G47 

B45.Vegetated.Wash.Complex.....................................................................................G48 

B46.Commercial.Development.....................................................................................G49 

G3

G4 

B1 Cottonwood / Rubber Rabbitbrush Woodland 

Figure.G1..Ground.photo.for.map.class.B1,. 

Cottonwood./.Rubber.Rabbitbrush.Woodland. 

Location: This map class was only mapped along the Puerco River corridor but it was also seen in small 

patches near a cattle tank in the northwestern corner of the environs and in the southwestern corner of 

the park along Highway 180. 

Photosignature: This map class was restricted to areas with intermittent stream flow. Populus fremontii 

trees appeared as large, bright green, globular crowns. Ericameria nauseosa shrubs appeared as large, gray 

green shrubs in the understory. 


Populus fremontii / Ericameria nauseosa Woodland 


Inter-Mountain Basins Riparian Woodland and Shrubland 

(1 of 3) 

Management map class Cottonwood / Rubber Rabbitbrush Woodland (1 of 1) 



(1 of 3) 

Number of map units in park 4 

Number of map units in park & environs 11 

Number of map units less than 0.5 ha 5 (5.5% of total map class area) 

Area of map class in park 

Area of map class in park & environs 

Proportion of map class in park 0.0% 

Proportion of map class in project environs 88.5% 

1.7 ha / 4.3 ac 

15.2 ha / 37.6 ac 

Base map class accuracy user 100.0 (42.5 - 100.0), producer 66.7 (25.4 - 92.2) 

Group map class accuracy user 40.9 (25.6 - 58.2), producer 81.8 (57.3 - 93.8) 

Management map class accuracy user 100.0 (42.5 - 100.0), producer 66.7 (25.4 - 92.2) 

Macrogroup map class accuracy user 40.9 (25.6 - 58.2), producer 81.8 (57.3 - 93.8) 


Figure.G2..Photosignature.for.map.class.B1,. 

Cottonwood./.Rubber.Rabbitbrush.Woodland. 

Documentation for base map class 

2 2003 relevés, 0 1996 relevés, 3 AA observation sites

B2 One-seed Juniper / Bigelow’s Sagebrush Shrubland 

Location: One-seed Juniper / Bigelow’s Sagebrush Shrubland was located throughout the park and its 

environs in a few small to large map units. These map units tended to occur on higher elevation mesas and 

plateaus and were most frequent on Chinde Mesa, Headquarters Mesa, and in the southwestern corner of 

the project area. 

Photosignature: Juniperus monosperma appeared as small, globular, green trees. They tended to be the 

tallest vegetation in the uplands and were easily identified. Artemisia bigelovii, a gray green dwarf shrub, 

was not easily identifiable. In areas where the soil had a strong color, Artemisia bigelovii were not always 

observable. In these areas, the dwarf shrubs were inferred to co-occur with Juniperus monosperma. In 

other areas, a uniform, gray green, smooth, speckled signature indicative of Artemisia bigelovii could be 

seen. Artemisia bigelovii did not always occur as a dominant species in the understory; in some areas it 

occurred only as an indicator species. 

G5 

Figure.G3..Ground.photo.for.map.class.B2,.Oneseed.Juniper./.Bigelow’s.Sagebrush.Shrubland. 

Figure.G4..Photosignature.for.map.class.B2,.Oneseed.Juniper./.Bigelow’s.Sagebrush.Shrubland. 


Juniperus monosperma / Artemisia bigelovii Woodland 

Group map class Colorado Plateau Pinyon-Juniper Woodland (1 of 1) 

Management map class One-seed Juniper / Bigelow's Sagebrush Shrubland (1 

of 1) 

Macrogroup map class Colorado Plateau Pinyon-Juniper Woodland (1 of 1) 





70.8 ha / 174.9 ac 

Total area of map class 

211.4 ha / 522.3 ac 

Proportion of land cover in park 0.2% 


Base map class accuracy 

user 81.8 (57.3 - 93.8), producer 100.0 (NA) 





2 2003 relevés, 0 1996 relevés, 12 AA observation sites 

Appendix G: Map Class summaries

G6 

B3 Blue Sage Dwarf-Shrubland 

Figure.G5..Ground.photo.for.map.class.B3,.Blue. 

Sage.Dwarf-Shrubland. 

Location: This map class was restricted to Chinde Mesa and its associated drainages. It occurred on the 

steep slopes of the mesa. 

Photosignature: This map class commonly occurred on deep, red clay soils. The shrubs appeared as 

grayish green, small, regularly spaced specks. Salvia pachyphylla was not easily distinguishable from other 

shrubs on the photos. Field data and locality information were used to determine the extent of this map 

class in the Chinde Mesa area. This map class also had occasional Juniperus osteosperma and Pinus edulis 

trees that appeared as large, globular trees that gradated from higher elevations. 


Salvia pachyphylla Dwarf-shrubland 

Group map class Inter-Mountain Basins Shale Badland (1 of 5) 

Management map class Blue Sage Dwarf-shrubland (1 of 1) 


Inter-Mountain Basins Semi-Desert Grassland and 

Steppe (1 of 17) 





69.2 ha / 171.0 ac 


122.8 ha / 303.5 ac 



Base map class accuracy user 100.0 (68.9 - 100.0), producer 100.0 (68.9 - 

100.0) 


Management map class accuracy user 100.0 (68.9 - 100.0), producer 100.0 (68.9 - 

100.0) 





Figure.G6..Photosignature.for.map.class.B3,.Blue. 

Sage.Dwark-Shrubland.

B4 Cliff-rose - Crispleaf Buckwheat Shrubland 

Location: Cliff-rose - Crispleaf Buckwheat Shrubland was restricted to Headquarters Mesa on the basaltcapped 

terraces. 

Photosignature: This map class was distinguished by the dark color of the underlying basaltic soils. 

Purshia stansburiana appeared on the photos as a large, dark green, scraggly shrub, and it occurred in low 

abundance with a patchy distribution. The understory, including Eriogonum corymbosum, was not easy to 

distinguish and typically looked like a mixture of dark green shrubs between the basaltic rocks. 

G7 

Figure.G7..Ground.photo.for.map.class.B4,.Cliffrose.-.Crispleaf.Buckwheat.Shrubland. 


Cliff-rose.-.Crispleaf.Buckwheat.Shrubland. 


Purshia stansburiana - Eriogonum corymbosum Shrubland 

Group map class Colorado Plateau Mixed Bedrock and Tableland (1 of 3) 

Management map class Cliff-rose - Crispleaf Buckwheat Shrubland (1 of 1) 

Macrogroup map class Colorado Plateau Mixed Bedrock and Tableland (1 of 3) 





57.1 ha / 141.1 ac 


57.1 ha / 141.1 ac 










G8 

B5 Copperweed - Alkali Sacaton Shrubland 


Copperweed.-.Alkali.Sacaton.Shrubland 

Location: Copperweed - Alkali Sacaton Shrubland was only mapped in two locations, both near the one 

classification relevé measured of this map class. This community type was not easily identified on aerial 

photography and was delineated based on field data from the southwestern slopes of Chinde Mesa. This 

map class occurred on the bank of a wash and likely occurs in small patches in other areas. 

Photosignature: The photosignature consisted of a dense patch of vegetation along the banks and in the 

middle of a wash. The vegetation appeared to be a bright green, homogenous color. This signature is typical 

of washes, and since it was not distinct enough to identify in other areas, we restricted our delineations 

of this map class to the one area with field data and extrapolated from there. 


Iva acerosa - Sporobolus airoides Shrubland 

Group map class Inter-Mountain Basins Wash (1 of 6) 

Management map class Vegetated Wash Complex (1 of 6) 

Macrogroup map class Inter-Mountain Basins Wash (1 of 6) 





2.0 ha / 4.9 ac 


2.0 ha / 4.9 ac 



Base map class accuracy user 0.0, producer 0.0 








Copperweed.-.Alkali.Sacaton.Shrubland.

B6 Coyote Willow Shrubland 

Location: Coyote Willow Shrubland occurred in a few small patches near the Puerco River in the park and 

several map units in the park environs. This map class had higher abundance and coverage outside the 

park boundary. It requires habitats with periodic stream flow. 

Photosignature: This type appeared as pale green, shrubby vegetation of medium height on islands in 

the channels of the Puerco River and large tributaries and along their margins. It often occurred alongside 

young saltcedar stands. 

G9 


Coyote.Willow.Shrubland. 


Coyote.Willow.Shrubland. 


Salix exigua / Barren Shrubland 



(1 of 3) 

Management map class Coyote Willow Shrubland (1 of 1) 



(1 of 3) 





2.2 ha / 5.4 ac 


13.2 ha / 32.5 ac 




100.0) 



100.0) 





G10 

B7 Drummond Goldenweed - Galleta Shrubland 


Drummond.Goldenweed.-.Galleta.Shrubland. 

Location: This map class typically occurred in washes and areas with temporary stream flow. Only one 

relevé was sampled of this map class and it is known to occur on the terrace between two washes. 

Photosignature: This map class did not have a distinct tone, texture, or color. It was identified solely by 

field observation. 


Isocoma drummondii - Pleuraphis jamesii Shrubland 








0.0 ha / 0.0 ac 


0.8 ha / 1.9 ac 



Base map class accuracy user NS, producer 0.0 








Drummond.Goldenweed.-.Galleta.Shrubland.

B8 Four-wing Saltbush / Galleta Shrubland 

Location: This map class was one of the most common steppe vegetation communities in the mapping 

area. It occurred throughout the project area on sandy soils and sand dunes. The only areas in the park 

that seemed to lack this map class were locations with sparse badland clay soils. 

Photosignature: Atriplex canescens appeared as a distinct, crisp speck on the photos. It tended to have a 

brownish green appearance. Although the sandy soils tended to mask the graminoids, the photosignature 

for this type often included patches of dense, green grasses. Pleuraphis jamesii cannot be isolated from 

other grass species, so the understory for this map class is a mix of herbaceous species. The understory 

often appeared as a light reddish/tan/brownish color and had a smooth appearance. Depending on where 

this community occurred, the abundance and cover of shrubs varies. 

G11 


Four-wing.Saltbush./.Galleta.Shrubland. 


Four-wing.Saltbush./.Galleta.Shrubland. 


Atriplex canescens / Pleuraphis jamesii Shrubland 

Group map class Southern Colorado Plateau Sand Shrubland (1 of 2) 


Sandsage - Fourwing Saltbush Colorado Plateau Shrubland 

(1 of 2) 

Macrogroup map class Southern Colorado Plateau Sand Shrubland (1 of 2) 





5473.8 ha / 13526.2 ac 


7339.8 ha / 18137.0 ac 










G12 

B9 Greasewood / New Mexico Saltbush Shrubland 


Greasewood./.New.Mexico.Saltbush.Shrubland 

Location: This type occurred in the Puerco River corridor in areas with high salinity and periodic water 

flow. 

Photosignature: Sarcobatus vermiculatus shrubs occurred as bright green, large, smooth shrubs. The 

spaces between the shrubs were often bright white, due to the high soil salinity. Sarcobatus vermiculatus 

also appeared to have a sprawling pattern. This map class also had smaller, light green, speckled shrubs of 

Atriplex obovata that were occasionally visible, depending on their contrast with the soil coloration. 


Sarcobatus vermiculatus / Atriplex obovata Shrubland 

Group map class Inter-Mountain Basins Greasewood Flat (1 of 3) 

Management map class Greasewood Flats (1 of 3) 

Macrogroup map class Inter-Mountain Basins Greasewood Flat (1 of 3) 





186.5 ha / 460.8 ac 


212.3 ha / 524.6 ac 











Greasewood./.New.Mexico.Saltbush.Shrubland.

B10 Greasewood / Shrubby Seepweed Shrubland 

Location: This type was found in low areas of poor drainage and high salinity, with periodic water flow. 

The areas were located south of the Puerco River in the river corridor. 

Photosignature: Sarcobatus vermiculatus shrubs appeared as large, bright green, and smooth on the 

aerial photos. Suaeda torreyana were small, slightly darker, and less rounded than Atriplex obovata. This 

type occurred in proximity to Greasewood / New Mexico Saltbush Shrubland. 

G13 


Greasewood./.Shrubby.Seepweed.Shrubland 


Greasewood./.Shrubby.Seepweed.Shrubland. 


Sarcobatus vermiculatus / Suaeda moquinii Shrubland 








6.3 ha / 15.6 ac 


7.4 ha / 18.3 ac 










G14 

B11 Iodine Bush Shrubland 


Iodine.Bush.Shrubland. 

Location: Allenrolfea occidentalis typically occurred in areas with saline and alkaline soils, mostly where 

there was temporary stream flow. It was mapped in the Painted Desert Wilderness area in larger washes 

and areas with sheetflow. 

Photosignature: Allenrolfea occidentalis appeared as a dark green, globular shrub on the photos. Since it 

was the dominant shrub in this map class with little other vegetative cover, this map class had large spaces 

between the shrubs, creating a mottled signature. The other prominent feature in this map class was the 

soil. The soil was often whitish due to the high salt content. Evidence of intermittent stream flow was also 

apparent on the photos, with water flow patterns appearing as striations on the whitish soils. 


Allenrolfea occidentalis Shrubland 








49.6 ha / 122.6 ac 


56.1 ha / 138.7 ac 











Iodine.Bush.Shrubland.


Rubber.Rabbitbrush.Desert.Wash.Shrubland. 

Plant communities Ericameria nauseosa Desert Wash Shrubland 






Area of map class in park 343.5 ha / 848.9 ac 

Total area of map class 508.4 ha / 1256.4 ac 

B12 Rubber Rabbitbrush Desert Wash Shrubland 

Location: This map class was almost always restricted to areas adjacent to washes. It typically occurred on 

terraces, banks of washes, or in areas with temporary stream flow, including the tributary washes of the 

Puerco River, Dry Wash, Cottonwood Wash, and Jim Camp Wash. 

Photosignature: This map class was distinguished by the large shrub Ericameria nauseosa. This shrub 

was often much larger than the surrounding vegetation. Ericameria nauseosa tended to have a light green 

color and a fairly smooth texture. The associated vegetation varied significantly depending on the location. 

In some areas, high shrub and herbaceous cover could be seen. However, in all areas of this map class the 

tall height of Ericameria nauseosa stood out in contrast to the height of other shrubs. 


G15 


Rubber.Rabbitbrush.Desert.Wash.Shrubland. 







Documentation for base map class 8 2003 relevés, 10 1996 relevés, 17 AA observation 

sites 


G16 

B13 Sandsage Colorado Plateau Shrubland 


Sandsage.Colorado.Plateau.Shrubland. 


Sandsage.Colorado.Plateau.Shrubland. 

Location: This map class occurred frequently throughout the park. It mainly occurred on sandy soils and 

on sand dunes. This map class was one of the most common map classes outside of the badlands, occurring 

in areas with alluvial soil development. The highest number of map units occurred in the park and its 

environs from the central hourglass portion to the southern project boundary. 

Photosignature: Artemisia filifolia appeared as a soft, smooth, gray green shrub. It typically appeared 

on the photos as a regularly spaced shrub. The herbaceous and associated species in the shrub layer were 

highly variable. In some areas, small shrubs could co-occur with Artemisia filifolia, which appeared as a 

smooth, light brown herbaceous cover, and/or a sparse understory. The most reliable feature of this map 

class was typically the sandy soils. The sandy soils were light brown with a soft texture. In areas with active 

sand dunes, the bumpy relief of the dunes was apparent on the photos. 


Artemisia filifolia Colorado Plateau Shrubland 

Group map class Southern Colorado Plateau Sand Shrubland (1 of 2) 


Sandsage - Fourwing Saltbush Colorado Plateau Shrubland 

(1 of 2) 

Macrogroup map class Southern Colorado Plateau Sand Shrubland (1 of 2) 





2577.8 ha / 6369.8 ac 


4492.3 ha / 11100.8 ac 










B14 Snakeweed - (Prickly Pear) / Galleta Dwarf-shrubland 

Location: This map class commonly occurs in disturbed areas. It occurred outside of the park boundary in 

areas with grazing impacts and within the park in areas with human disturbance, such as along pipelines, 

road corridors, and near developments. 

Photosignature: Gutierrezia sarothrae appeared as a mottled, patchy signature of a greenish brown 

shrub. It often appeared to have a low cover of herbaceous species. The light brownish hue may have indicated 

Pleuraphis jamesii. In some areas, the total vegetation cover was low and the low cover was characteristic 

of this class. This map class tended to occur on deep, red clay soil. This signature was not particularly 

strong and its identification was often based on field data and extrapolated to surrounding areas. 

G17 


Snakeweed.-.(Prickly.Pear)./.Galleta.Dwarfshrubland. 


Snakeweed.-.(Prickly.Pear)./.Galleta.Dwarfshrubland. 


Gutierrezia sarothrae - (Opuntia spp.) / Pleuraphis jamesii 



Inter-Mountain Basins Semi-Desert Shrub-Steppe (1 of 

5) 

Management map class Alkali Sacaton Steppe and Mixed Grasslands (1 of 8) 








169.7 ha / 419.4 ac 


438.7 ha / 1084.1 ac 




user 0.0, producer NS 







G18 

B15 Tamarisk Shrubland 


Tamarisk.Shrubland. 

Location: Tamarisk Shrubland occurred in small patches along riparian corridors, predominately in the 

Puerco River corridor, and in small patches in the northern wilderness area in areas with a high water table. 

It is also known to occur in areas with human development, such as near residences and stock ponds. 

Photosignature: Tamarix spp. appeared as small tree with a smooth texture and a bright green crown. It 

often occurred in thick patches or linear stands, without any other obvious understory species. 


Tamarix spp. Semi-Natural Temporarily Flooded Shrubland 



(1 of 3) 




(1 of 3) 





62.0 ha / 153.3 ac 


154.6 ha / 382.1 ac 











Tamarisk.Shrubland.

B16 Three-leafed Sumac - Mormon Tea Talus Shrubland 

Location: Mormon Tea - Three-leafed Sumac Talus Shrubland occurred in a few small areas throughout 

the mapping area, including the southwestern corner of the northern section of the park, the northwestern 

corner of the southern section of the park near Jasper Forest, and in several rocky outcrops in the 

southern section of the park south of Jasper Forest. It was found on talus slopes and often in areas with 

large sandstone boulders. 

Photosignature: Large boulders and bedrock were the most distinct features in this map class. They appeared 

as large blocks on the edges and slopes of mesas. Ephedra viridis and Rhus trilobata both appeared 

as a deep green color. The talus slopes were often sparsely vegetated with a few individual specks of 

shrubs scattered between the boulder cracks. Because it was difficult to distinguish different plant characteristics 

among the talus slopes, this class was often lumped in with the Rim Complex. 

G19 


Three-leafed.Sumac.-.Mormon.Tea.Talus.Shrubland. 


Three-leafed.Sumac.-.Mormon.Tea.Talus.Shrubland. 


Rhus trilobata - Ephedra (viridis, torreyana) Talus Shrubland 


Management map class Vegetated Rim Complex (1 of 4) 






36.2 ha / 89.5 ac 


98.3 ha / 242.8 ac 










G20 

B17 Winter-fat / Blue Grama Dwarf-shrubland 


Winter-fat./.Blue.Grama.Dwarf-shrubland. 


Winter-fat./.Blue.Grama.Dwarf-shrubland. 

Location: Winter-fat / Blue Grama Dwarf-shrubland was mapped at one location in the park: northeast of 

The Flattops. This map class occurred intermittently in the sandy soils of the project area. 

Photosignature: Krascheninnikovia lanata tended to appear on the photos as a dark, gray green, smooth 

dwarf-shrub. In some areas the interspaces have a tan or pale tan color and a smooth texture, indicating 

herbaceous bunch grasses and sandy soils. Bouteloua gracilis was not distinguishable from other grasses 

and was not easily identifiable on the photos. In other areas, the cover of Krascheninnikovia lanata was 

particularly high and the texture appeared smooth with one solid, gray green color. 


Krascheninnikovia lanata / Bouteloua gracilis Dwarfshrub 




5) 

Management map class Blue Grama Steppe and Mixed Grasslands (1 of 3) 








3.0 ha / 7.4 ac 


3.0 ha / 7.4 ac 




user 0.0 (NA), producer 0.0 (NA) 







B18 Alkali Sacaton Herbaceous Vegetation 

Location: Alkali Sacaton Herbaceous Vegetation occurred in small patches throughout the project area. 

This map class mainly occurred in the grasslands in the northeastern, central, and southern sections of the 

park. It was often found in habitats with a little extra moisture such as areas with periodic sheet flow and 

in small drainages. 

Photosignature: This photosignature stands out in the short-grass prairie. It commonly appeared in dense 

linear patches that follow small washes or sheet-flow features. The color tended to be a light yellow to 

greenish brown. Although Sporobolus airoides commonly occurred throughout the park, this map class 

tended to have a higher cover and could be easily distinguished from mixed herbaceous associations of the 

adjacent map classes. 

G21 

Figure.G35..Ground.photo.for.map.class.B18,.Alkali. 

Sacaton.Herbaceous.Vegetation. 


Alkali.Sacaton.Herbaceous.Vegetation. 


Sporobolus airoides Southern Plains Herbaceous Vegetation 

Group map class Inter-Mountain Basins Semi-Desert Grassland (1 of 7) 









92.3 ha / 228.0 ac 


125.3 ha / 309.6 ac 










G22 

B19 Alkali Sacaton - Blue Grama Herbaceous Vegetation 


Alkali.Sacaton.-.Blue.Grama.Herbaceous. 

Vegetation. 

Figure.G38..Photosignature.for.map.class. 

B19,.Alkali.Sacaton.-.Blue.Grama.Herbaceous. 


Location: Alkali Sacaton - Blue Grama Herbaceous Vegetation occurred throughout the project area. Three 

main areas of this association occurred, including the northeastern section of the project area, the central 

neck area between the Puerco River and Interstate 40, and east of The Flattops. This map class was almost 

equally distributed between the NPS land and the project environs. 

Photosignature: Grass species were not easily identifiable on the aerial photography. The photosignature 

appeared to have a smooth texture and depending on the herbaceous cover, the color appeared to have a 

green to grayish brown color. This map class was difficult to distinguish from the most of the other shortgrass 

herbaceous map classes. It was most commonly identified during the photointerpretation from the 

field data collection and extrapolated from these locations. 


Sporobolus airoides - Bouteloua gracilis Herbaceous 











284.2 ha / 702.3 ac 


377.1 ha / 931.8 ac 










B20 Black Grama - Galleta Herbaceous Vegetation 

Location: Black Grama - Galleta Herbaceous Vegetation was only mapped in the park in five locations, 

four by the northern headquarters office and one in the central neck section of the park. 

Photosignature: Because the different grass species (especially the Bouteloua) were difficult to distinguish 

from one another on the aerial photos, this type was not mapped. Black grama was observed to occur 

in patches in the midst of other vegetation types and was usually incorporated into the surrounding map 

classes (e.g. Sandsage Colorado Plateau Shrubland). 

G23 


Black.Grama.-.Galleta.Herbaceous.Vegetation. 


Black.Grama.-.Galleta.Herbaceous.Vegetation. 


Bouteloua eriopoda - Pleuraphis jamesii Herbaceous 











23.6 ha / 58.3 ac 


23.6 ha / 58.3 ac 











G24 

B21 Blue Grama Herbaceous Vegetation 


Blue.Grama.Herbaceous.Vegetation. 


Blue.Grama.Herbaceous.Vegetation. 

Location: Blue Grama Herbaceous Vegetation occurred in a few small patches throughout the mapping 

area, including the northwestern corner around Pilot Rock, the southwestern portion of the northern half 

of the park, the central neck area of the project boundary, and the southern half of the park near The Flattops 

and Agate House. The majority of this map class occurred in the project environs, outside of the park 

boundary. 

Photosignature: Bouteloua gracilis was not easily identifiable on the aerial photos from other short 

stature grasses at Petrified Forest NP. Field data was used to extrapolate the boundaries of this map class 

within adjacent herbaceous communities. This map class had a similar color and texture to other herbaceous 

map classes. Depending on the soil color and vegetative cover, the color of the map class varied 

from a light red to a light brown. The vegetation was patchy with low total herbaceous cover in areas. 

Where the herbaceous cover was present, the grasses had a homogenous texture. 


Bouteloua gracilis Herbaceous Vegetation 










33.6 ha / 83.0 ac 


261.1 ha / 645.1 ac 

Proportion of land cover in park 

0.1% park land cover 


Base map class accuracy user 0.0, producer 0.0 







B22 Blue Grama - Galleta Herbaceous Vegetation 

Location: Blue Grama - Galleta Herbaceous Vegetation occurred in a few small patches throughout the 

mapping area, including the northwestern corner around Pilot Rock, the area near the northern headquarters 

office, central neck area, and in the southern portion of the park. 

Photosignature: Individual grass species were not identifiable and together they combined into one solid 

color, varying from light green to brown. Depending on the soil color, the herbaceous cover was more or 

less prominent. The texture could be patchy depending on the total vegetation cover. 

G25 


Blue.Grama.-.Galleta.Herbaceous.Vegetation. 


Blue.Grama.-.Galleta.Herbaceous.Vegetation. 


Bouteloua gracilis - Pleuraphis jamesii Herbaceous 











145.0 ha / 358.3 ac 


544.1 ha / 1344.5 ac 








3 2003 relevés, 13 1996 relevés, 16 AA observation 

sites 


G26 

B23 Galleta - Alkali Sacaton Herbaceous Vegetation 


Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation.. 


Galleta.-.Alkali.Sacaton.Herbaceous.Vegetation.. 

Location: Galleta - Alkali Sacaton Herbaceous Vegetation was located throughout the park and project 

environs. This map class was most abundant in the central and southern parts of the park and was more 

abundant in both size and number of map units in the park environs than inside the park boundary. It was 

often found on sandy soils. 

Photosignature: This photosignature had a smooth texture and depending on its cover, the color appeared 

as a green to grayish color. This map class was difficult to distinguish from the other herbaceous 

map classes and was most commonly identified from the field data collection and extrapolated from these 

locations. This type commonly occurred in areas adjacent to the Four-wing Saltbush / Galleta Shrubland. 


Pleuraphis jamesii - Sporobolus airoides Herbaceous 











1586.0 ha / 3919.2 ac 


4143.3 ha / 10238.3 ac 









sites 


B24 Giant Sandreed Desert Wash Shrub Herbaceous Vegetation 

Location: Giant Sandreed Desert Wash Shrub Herbaceous Vegetation was limited to the southern half of 

the project boundary and was mostly located in Dry Wash and its side drainages. In some cases it was not 

distinguishable and was likely included in the Wash Complex map class. 

Photosignature: This map class had a light yellow signature with a feathery look to the vegetation. It 

typically occurred along linear corridors, following washes. It was sometimes difficult to distinguish from 

the adjacent riparian vegetation and may have been included into the Wash Complex map class. This map 

class was mainly identified from field data and extrapolated out to adjacent areas. 

G27 


Giant.Sandreed.Desert.Wash.Shrub.Herbaceous. 


Figure.G48..Photosignature.for.map.class.B24. 

Giant.Sandreed.Desert.Wash.Shrub.Herbaceous. 



Calamovilfa gigantea Desert Wash Shrub Herbaceous 









17.7 ha / 43.7 ac 


33.0 ha / 81.5 ac 











G28 

B25 New Mexico Saltbush / Alkali Sacaton – Galleta Shrub Herbaceous Vegetation 


New.Mexico.Saltbush./.Alkali.Sacaton.–.Galleta. 

Shrub.Herbaceous.Vegetation. 


New.Mexico.Saltbush./.Alkali.Sacaton.–.Galleta. 

Shrub.Herbaceous.Vegetation. 

Location: New Mexico Saltbush / Galleta - Alkali Sacaton Shrub Herbaceous Vegetation had the largest 

area mapped of any of the map classes and occurred throughout the park and the environs. This map class 

tended to favor clay and sandy clay soils; however, it also appeared less commonly in sand dunes or in 

heavy sandy soils. 

Photosignature: This photosignature appeared to have a light tan to brownish gray color. The texture 

appeared smooth and individual shrubs and grasses were not easily identifiable. This map class was typically 

used in badlands areas where the vegetation was more than sparse (2-15% cover), where the area 

appeared to have a shrub component, and where the soils do not mask the vegetation. 


Atriplex obovata / Sporobolus airoides - Pleuraphis 

jamesii Shrub Herbaceous Vegetation 



5) 









9218.0 ha / 22778.2 ac 


11046.0 ha / 27295.3 ac 









sites 


B26 Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation 

Location: Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation occurred in the northwestern 

and north central sections of the mapping area. It was with heavily abundant in the neck of the mapping 

area and scattered throughout the southern half of the mapping area. It commonly occurred on sand 

dunes, in disturbance areas, or on terraces. 

Photosignature: This map class was distinguished by the small, green, speckled appearance of Ericameria 

nauseosa and the moderate herbaceous cover. The herbaceous cover tended to have a light brown/yellowish 

hue with a patchy distribution. Bouteloua gracilis likely is a dominant component to the herbaceous 

understory; however, it could not be distinguished from the other herbaceous cover on the imagery. 

G29 


Rubber.Rabbitbrush./.Blue.Grama.Shrub. 



B26,.Rubber.Rabbitbrush./.Blue.Grama.Shrub. 



Ericameria nauseosa / Bouteloua gracilis Shrub Herbaceous 



Inter-Mountain Basins Active and Stabilized Dune (1 of 

2) 




2) 





850.7 ha / 2102.2 ac 


1530.3 ha / 3781.5 ac 










G30 

B27 Russian Thistle Sand Dune Vegetation 


Russian.Thistle.Sand.Dune.Vegetation. 


Russian.Thistle.Sand.Dune.Vegetation. 

Location: Russian Thistle Sand Dune Vegetation was located in several small map units throughout the 

project boundary. It was most frequent south of the neck area and north of The Flattops. This map class 

occurred most commonly on unstable surfaces, such as active sand dunes and areas with sandy soils and 

recent human disturbance. It was also found along roadsides and on pipeline corridors. 

Photosignature: The landscape features of this map class were often easier to distinguish than the 

vegetation. Sand dunes and human disturbance areas with sandy soils that are dominated by herbaceous 

cover tended to be classified as this map class. This map class appeared to have a blotchy texture due to 

the barren spaces between the vegetation. Where these areas were vegetated, the herbaceous cover had a 

distinctive golden-yellow to light brown color. 


Salsola tragus Sand Dune Vegetation 



2) 

Management map class Russian Thistle Sand Dune Vegetation (1 of 1) 



2) 





95.9 ha / 236.9 ac 


100.7 ha / 248.9 ac 










B28 Whipple Cholla - Alkali Sacaton Shrub Herbaceous Vegetation 

Location: Whipple Cholla / Alkali Sacaton Shrub Herbaceous Vegetation was restricted to one small map 

unit on the northern project boundary on Chinde Mesa. Mapping was based on field data from the classification 

relevés. 

Photosignature: This type was difficult to distinguish on the photos from other herbaceous vegetation 

with various shrubby components. Many occurrences were small inclusions in a matrix of Rubber Rabbitbrush 

/ Blue Grama or other types of shrub herbaceous vegetation. 

G31 

Figure.G55..Ground.photo.for.map.class. 

B28,.Whipple.Cholla.-.Alkali.Sacaton.Shrub. 



B28,.Whipple.Cholla.-.Alkali.Sacaton.Shrub. 



Opuntia whipplei - Sporobolus airoides Shrub Herbaceous 











0.0 ha / 0.0 ac 


0.6 ha / 1.6 ac 




Not assessed 







G32 

B29 Arizona Siltbush Sparse Vegetation 


Arizona.Siltbush.Sparse.Vegetation. 

Location: Arizona Siltbush Sparse Vegetation, one of the most common map classes in the badlands of 

the park, occurred in large areas. It occurred in the northern half of the northern wilderness area, and to 

the south from The Tepees all the way into the southern project environs. It most commonly occurred on 

white, grey blue, and reddish clay soil and in areas with periodic sheet flow. 

Photosignature: This map class was most commonly identified by the washed out striations in the white 

and grey blue to reddish clay soils. The low total vegetation cover and the strong color signature of the 

soils made it difficult to pick out the vegetation on the aerial photos. Where the vegetation could be seen, 

it appeared as small, light, grey brown specks with very large and irregular spaces between plants. 


Zuckia brandegeei Sparse Vegetation 


Management map class Badland Sparse Vegetation (1 of 3) 








2165.3 ha / 5350.7 ac 


2685.0 ha / 6634.8 ac 









sites 



Arizona.Siltbush.Sparse.Vegetation.

B30 New Mexico Saltbush Badland Sparse Vegetation 

Location: New Mexico Saltbush Sparse Vegetation was a very common map class. It was characteristically 

found on bentonite clay soils in the badlands, but it occurred throughout the entire project boundary. 

Photosignature: This map class was often the default map class assigned to the vegetated badlands in 

the project boundary. It occurred on all of the various badland soils and occurred throughout the project 

boundary. The vegetation cover ranged from a low to moderate cover. In most areas, the vegetation was 

not easily identified due to its sparseness and the strong soil signature masking the vegetation. In some 

areas Atriplex obovata appeared as small specks with large spaces between plants and a light greenish/ 

gray color. 

G33 

Figure.G59..Ground.photo.for.map.class. 

B30,.New.Mexico.Saltbush.Badland.Sparse. 



B30,.New.Mexico.Saltbush.Badland.Sparse. 



Atriplex obovata Badland Sparse Vegetation 



5) 









6815.6 ha / 16841.7 ac 


5497.4 ha / 13584.5 ac 









sites 


G34 

B31 Slender Buckwheat Sparse Vegetation 


Slender.Buckwheat.Sparse.Vegetation. 

Location: Slender Buckwheat Sparse Dwarf-shrubland Vegetation occurred in small patches throughout 

the project area. It was most common in the park badland environments near Headquarters Mesa and near 

The Flattops and the Crystal Forest in the south. It commonly occurred on the white and/or light-colored 

pinkish soils in the badlands. 

Photosignature: This map class was most commonly identified by the light colored soils of the badlands. 

The white and pink soils commonly washed out most of the vegetation signature, making it difficult to 

identify the vegetation. The total vegetation cover was always sparse to low cover. Where the vegetation 

could be seen, it appeared as small, light brown and green specks with very large spaces between plants. 


Eriogonum leptophyllum Sparse Vegetation 










113.3 ha / 280.0 ac 


114.0 ha / 281.8 ac 











Slender.Buckwheat.Sparse.Vegetation.

B32 Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation 

Location: Torrey’s Jointfir – Bigelow’s Sagebrush Sparse Vegetation occurred widely throughout the park, 

with the greatest concentration of map units located on the tops of sandstone mesas and plateaus. 

Photosignature: Artemisia bigelovii, a gray green dwarf shrub, had a uniform, gray green, smooth speckled 

signature. It tended to occur in a regular pattern. In some areas it was difficult to identify Artemisia 

bigelovii; however, the bedrock striations of the sandstone tended to indicate this map class. It also tended 

to occur on the lighter white-to-gray clay soils. Ephedra torreyana does not have a strong signature and 

was not reliably identified on the aerial photos. 

G35 


Torrey’s.Jointfir.–.Bigelow’s.Sagebrush.Sparse. 


Figure.G64..Photosignature.for.map.class.B32. 

Torrey’s.Jointfir.–.Bigelow’s.Sagebrush.Sparse. 



Ephedra torreyana – Artemisia bigelovii Sparse Vegetation 


Inter-Mountain Basins Semi-Desert Shrub Steppe (1 of 

5) 









2119 ha / 5237 ac 


3227 ha / 7975 ac 

Proportion of land cover in park 66% 

Proportion of map class in project environs 34% 

Base map class accuracy user 56.7 (41.9 – 70.4), producer 17.9 (9.0 – 32.4) 

Group map class accuracy user 41.8 (34.7 – 49.2), producer 38.1 (31.5 – 45.1) 





sites 


G36 

B33 Airstrip 


Airstrip. 

Location: Southwest of the south park entrance, southwestern corner of study area, outside of park 

boundaries. 

Photosignature: This map unit appeared as two bladed dirt strips perpendicular to each other, running 

northeast-southwest and northwest-southeast. 


NA 

Group map class Transportation (1 of 3) 

Management map class Airstrip (1 of 1) 

Macrogroup map class Transportation (1 of 1) 



Number of map units less than 0.5 ha 0 

Area of map class in park 0 


2.6 ha / 6.5 ac 

Proportion of land cover in park 0 

Proportion of map class in project environs 100% 


Not assessed 

Group map class accuracy 

Not assessed 

Management map class accuracy 

Not assessed 

Macrogroup map class accuracy 

Not assessed 




B34 Barren Badlands 

Photosignature: The map class was identified on colorful clay soils without any speckles of vegetation. 

Location: This was the most common non-vegetated map class in the badlands within the project boundary. 

It occurred throughout the project boundary in areas that had less than 2% vegetation cover. 

G37 


Barren.Badlands. 


Barren.Badlands. 


NA 










4664.9 ha / 11527.3 ac 


5587.5 ha / 13807.1 ac 










G38 

B35 Barren Wash 


Barren.Wash. 

Location: This map class occurred in the project boundary in sandy wash bottoms washes that have no to 

little vegetation. It occurred mainly in areas where periodic water flow limits vegetation establishment. The 

ground photo shows the barren wash bottom with adjacent vegetation. 

Photosignature: This map class was identified in wash bottoms as a light brownish, tan color without any 

speckles of vegetation. 


NA 


Management map class Barren Wash (1 of 1) 






319.4 ha / 789.1 ac 


498.7 ha / 1232.4 ac 











Barren.Wash.

B36 Park Facilities 

Location: This map class occurred in areas where the park had developed infrastructure. The map class 

describes National Park Service buildings, housing, and visitor-use buildings. 

Photosignature: This map class appeared in developed areas within the park as tall structures in the form 

of buildings or other park infrastructure. 

G39 

Figure.G70..Photosignature.for.map.class.B36,.Park. 

Facilities. 


NA 

Group map class Park Facilities (1 of 2) 

Management map class Park Facilities (1 of 1) 

Macrogroup map class Park Facilities (1 of 2) 





16.0 ha / 39.5 ac 


16.0 ha / 39.5 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




G40 

B37 Park Sites 

Figure.G71..Photosignature.for.map.class.B37,.Park. 

Sites. 

Location: This map class identified the tourist site at the archeological site of the Puerco River pueblo. 

Photosignature: This map class appeared as linear lines that form old building structures with walls outlining 

the prehistoric pueblo. 


NA 

Group map class Park Facilities (1 of 2) 

Management map class Park Sites (1 of 1) 

Macrogroup map class Park Facilities (1 of 2) 





0.8 ha / 1.9 ac 


0.8 ha / 1.9 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




B38 Railroad 

Location: This map class identified the railroad that goes east/west through the project area. 

Photosignature: This map class appeared as two linear tracks with a fence line paralleling the linear 

tracks. 

G41 


Railroad. 


NA 


Management map class Railroad (1 of 1) 






2.3 ha / 5.7 ac 


5.2 ha / 12.9 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




G42 

B39 Residences 


Residences. 

Location: This map class appeared outside of the park boundary in the project environs. This map class 

was not very common and occurred mainly in small map units. 

Photosignature: This map class typically appeared as square/rectangular houses or buildings. These structures 

stood out due to their regularity and height. 


NA 

Group map class Residential (1 of 1) 

Management map class Residences (1 of 1) 

Macrogroup map class Residential (1 of 1) 





0.1 ha / 0.2 ac 


2.4 ha / 6.0 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




B40 Roads 

Location: This map class occurred throughout the entire project boundary. The main paved road runs 

north and south, bisecting the park. 

Photosignature: This map class appeared as a dark linear feature in areas where the roads are paved. 

In the unpaved areas, the roads appeared un-vegetated. Often a two-track could be seen on the photos 

where cars drive on unpaved ground. 

G43 


Roads. 


NA 


Management map class Roads (1 of 1) 






143.6 ha / 354.9 ac 


217.6 ha / 537.6 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




G44 

B41 Run-off Control Feature 

Figure.G75..Photosignature.for.map.class.B41,.Runoff.Control.Feature. 

Location: These features were found in and alongside washes and in other areas of high erosion potential. 

They were apparently constructed to divert water into particular areas to protect culverts and other 

structures. 

Photosignature: These features were identified by their location and shape, i.e. linear, raised areas along 

drainages. 


NA 

Group map class Agriculture (1 of 2) 

Management map class Run-off Control Feature (1 of 1) 

Macrogroup map class Agriculture (1 of 2) 





0.5 ha / 1.3 ac 


0.5 ha / 1.3 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




B42 Sand 

Location: This map class appeared mainly in the northern half of the project boundary. 

Photosignature: This map class was used in areas where there was a lot of sand and the vegetation was 

sparse to absent. The sand appeared as a light brown, reddish color and did not have any speckling of 

vegetation. 

G45 


Sand. 


NA 


Management map class Sand / Mudflat (1 of 1) 








2.8 ha / 6.9 ac 


2.8 ha / 6.9 ac 




100.0) 



100.0) 





G46 

B43 Stock Ponds 


Stock.Ponds. 

Location: This map class appeared outside of the park boundary in the project environs. This map class 

was not very common and often occurred in small patches. 

Photosignature: This map class typically appeared as round depressions in the soil. The vegetation was 

commonly not present or present with low cover. The stock tanks tended to have a light hue due to the 

extra salinity in the soil. 


NA 

Group map class Agriculture (1 of 2) 

Management map class Stock Ponds (1 of 1) 

Macrogroup map class Agriculture (1 of 2) 





0.0 ha / 0.0 ac 


8.8 ha / 21.8 ac 




Not assessed 


Not assessed 


Not assessed 


Not assessed 




B44 Vegetated Rim Complex 

Location: This map class occurred on the mesa rims, commonly in long linear patches. 

Photosignature: This map class was identified by a mixed signature of various dwarf-shrub and herbaceous 

species adjacent to the mesa rims. The signature was not consistent and appeared to have a mixed 

tone, texture, and color. 

G47 


Vegetated.Rim.Complex. 


Vegetated.Rim.Complex. 


NA 








167.4 ha / 413.6 ac 


223.2 ha / 551.5 ac 










G48 

B45 Vegetated Wash Complex 


Vegetated.Wash.Complex. 

Location: This map class occurred on the banks of washes, often in linear patches. This map class extended 

throughout the entire project boundary. 

Photosignature: This map class appeared as a mixed signature of various shrub and herbaceous species 

within drainages. It was a combination of multiple map classes, and the photointerpreters used it only 

when the associated plant communities were not distinguishable on the photos as distinct map units. 

Vegetated wash communities tended to vary in height, color, tone, and texture. 


NA 








1385.8 ha / 3424.5 ac 


1873.2 ha / 4628.7 ac 











Vegetated.Wash.Complex.

B46 Commercial Development 

Location: Turnoff from Highway 189 to south entrance of park, and along Highway 189 at western 

boundary of study area. 

Photosignature: This map class represents retail stores, residences, and parking lots in the park environs. 

The areas were detected by shape and known location. 


Commercial.Development. 


NA 

Group map class Development (1 of 1) 

Management map class Commercial Development (1 of 1) 

Macrogroup map class Development (1 of 1) 





< .5 ha 


1.4 ha / 3.5 ac 

Proportion of land cover in park < .5% 

Proportion of map class in project environs > 99.5% 


Not assessed 


Not assessed 


Not assessed 


Not assessed 



Appendix G: Map Class summaries 

G49

Appendix H: Accuracy Assessment Data 

Appendix H 

Accuracy assessment data 

Appendix H consists of four contingency tables, also known as error matrices, showing the accuracy 

assessment for the base map classes (H-1), group map classes (H-2), macrogroup map classes (H-3), and 

management map classes (H-4). Each table includes rows representing the map classes for polygons in the 

vegetation map database (Vegetation Map Database Map Class), and columns representing the accuracy 

assessment made in the field for that polygon (Field Assessment Map Class). A perfect correspondence 

between the map and the field is indicated by a tally in the matrix where the row and column intersect for 

the same map class. For example, in Table H-1, the intersection of row and column B32 shows a tally of 17, 

indicating that in the field accuracy assessment, six of the polygons on the map were found to be the same 

map class in the field as that mapped. The contingency table also shows the source of error in the map. In 

row B32, the table shows that the field crew found some of the the polygons mapped as B32 to be actually 

other map classes. Column B32 indicates that some areas not mapped as B32, were found to be map unit B32 

in the field. 

The number of correctly mapped polygons, as determined in the accuracy assessment, occur on the shaded 

diagonal of the contingency table. User and producer accuracy, 90% confidence intervals for each, overall 

accuracy, Kappa accuracy, and Kappa accuracy standard error are reported. The Kappa accuracy and 

standard error do not include vegetation map database map classes that were not field assessed. 

Each table is accompanied by a key code for the map classes. In the example given above, B32 is Torrey’s 

Jointfir Bigelow’s Sagebrush Sparse Shrubland. 

For each table, the following notations are used: 

● NTF - None that fits; the assessment in the field did not match any existing map classes. 

● NA - Not applicable; unable to compute confidence intervals because there were no polygons assessed as 

correct in the field. 

● N/S - Not sampled; unable to compute producer or user accuracy assessment since the polygons were not 

sampled. 

Note: Due to their size, Tables H-1 and H-4 are spread across two pages and should be read accordingly. The 

keys for Tables H-1 and H-4 appear on the page that follows the table. 

H1


Table H-1. Contingency table: Base map classes. 

Field assessment map class 

Vegetation map database map class 

Map 

code 

B32 B3 B4 B16 B44 B27 B29 B34 B30 B24 B31 B35 B5 B7 B42 B12 B45 B19 

B32 17 2 1 1 1 

B3 6 

B4 2 8 

B16 2 1 1 2 2 2 1 

B44 5 4 12 2 2 1 1 

B27 1 10 1 1 

B29 1 4 12 3 1 

B34 1 28 2 1 

B30 1 1 1 13 5 1 2 

B24 2 

B31 1 5 2 1 1 7 

B35 1 3 2 17 

B5 1 0 

B7 0 

B42 0 1 2 

B12 2 11 1 1 

B45 1 2 1 2 2 19 

B19 6 

B18 1 1 1 5 

B20 

B22 1 

B21 

B23 1 2 1 

B9 3 

B10 

B11 2 1 1 1 

B25 1 1 1 2 1 3 1 4 

B26 4 6 1 2 1 6 

B14 1 4 

B1 

B6 

B15 1 2 1 7 

B8 2 1 1 2 

B13 1 1 

B17 1 

B2 1 

Number of samples 10 38 6 9 5 23 18 12 52 28 2 14 20 2 7 0 17 38 40 

Producer accuracy 

/ omission error 

(%correct) 

NTF 44.7 100.0 88.9 20.0 52.2 55.6 33.3 53.8 17.9 100.0 50.0 85.0 0.0 0.0 N/S 64.7 50.0 15.0 

90% confidence 

interval (-) 

NTF 32.3 68.9 62.3 4.6 35.7 36.9 15.9 42.6 9.0 42.5 30.0 67.8 N/A N/A N/S 44.9 37.1 8.0 


interval (+) 

NTF 57.9 100.0 97.5 56.5 68.2 72.8 56.9 64.7 32.4 100.0 70.1 93.8 N/A N/A N/S 80.5 62.9 26.5 

Overall accuracy = 40.6% Kappa index = 42.2% Standard error = 0.22 

H2


Number of 

samples 

User accuracy/ 

commission error 

(% correct) 

90% Confi dence 

intervals 

B18 B20 B22 B21 B23 B9 B10 B11 B25 B26 B14 B1 B6 B15 B8 B13 B17 B2 - + 

1 3 3 1 30 56.7 41.9 70.4 

6 100.0 68.9 100.0 

2 12 66.7 43.1 84.1 

11 9.1 2.1 32.3 

1 28 42.9 28.8 58.2 

1 2 1 1 1 1 20 50.0 32.7 67.3 

2 7 30 13.3 6.1 26.6 

32 87.5 74.9 94.3 

1 6 31 16.1 8.1 29.6 

2 100.0 42.5 100.0 

1 18 38.9 22.7 58.0 

1 24 70.8 54.1 83.3 

1 0.0 N/A N/A 

0 N/S N/S N/S 

2 5 0.0 N/A N/A 

1 1 2 1 9 2 31 35.5 23.0 50.3 

1 28 67.9 52.3 80.2 

5 4 1 16 37.5 20.8 57.8 

5 1 2 2 7 25 20.0 10.1 35.8 

2 0 2 4 0.0 N/A N/A 

3 2 3 9 33.3 14.2 30.2 

2 0 1 2 5 0.0 N/A N/A 

1 2 16 6 29 55.2 40.2 69.3 

4 1 13 2 2 6 31 41.9 28.6 56.6 

1 1 100.0 27.0 100.0 

1 4 3 6 19 21.1 9.8 39.5 

1 1 2 12 30 40.0 27.7 54.9 

1 3 2 1 1 1 29 6.9 2.3 18.8 

11 1 11 1 0 1 30 0.0 N/A N/A 

2 2 100.0 42.5 100.0 

1 1 100.0 27.0 100.0 

1 6 1 19 31.6 17.3 50.4 

3 1 1 2 12 5 30 40.0 26.7 54.9 

1 1 1 5 17 2 29 58.6 43.5 72.3 

0 1 0.0 N/A N/A 

1 9 11 81.8 57.3 93.8 

37 0 16 1 43 16 5 6 62 5 0 3 1 7 45 27 6 9 

Total number of 

samples: 630 

13.5 N/S 18.8 0.0 37.2 81.3 20.0 66.7 19.4 40.0 N/S 66.7 100.0 85.7 26.7 63.0 0.0 100.0 

Total samples where 

6.7 N/S 7.8 N/A 26.2 61.2 4.6 34.7 12.5 14.3 N/S 25.4 27.0 54.8 17.4 47.2 N/A N/A the field classification 

and the map classification 

25.3 N/S 38.8 N/A 49.8 92.2 56.5 88.3 28.8 72.8 N/S 92.2 100.0 96.7 38.9 76.4 N/A N/A 

matched: 256 

H3


Key to base map class codes in Table H-1 

B1 

B2 

B3 

B4 

B5 

B6 

B7 

B8 

B9 

B10 

B11 

B12 

B13 

B14 

B15 

B16 

B17 

B18 

B19 

B20 

B21 

B22 

B23 

B24 

B25 

B26 

B27 

B29 

B30 

B31 

B32 

B34 

B35 

B42 

B44 

B45 

Cottonwood / Rubber Rabbitbrush Woodland 

One-seed Juniper / Bigelow’s Sagebrush Shrubland 


Cliff-rose - Crispleaf Buckwheat Shrubland 




Four-wing Saltbush / Galleta Shrubland 








Three-leafed Sumac - Mormon Tea Talus Shrubland 

Winter-fat / Blue Grama Dwarf-shrubland 


Alkali Sacaton - Blue Grama Herbaceous Vegetation 






New Mexico Saltbush / Galleta - Alkali Sacaton Shrub Herbaceous Vegetation 

Rubber Rabbitbrush / Blue Grama Shrub Herbaceous Vegetation 




Slender Buckwheat Sparse Vegetation 

Torrey’s Jointfir Bigelow’s Sagebrush Sparse Shrubland 


Barren Wash 




H4


Table H-2. Contingency table: Group map classes. 


Number of samples 

User accuracy/commission 

error (% correct) 

90% Confi dence intervals 

Map 

code 

 

G2 2 

G11 1 

G10 2 

G5 1 

G9 1 

G6 2 

G8 

G7 1 

G14 

G3 

Number of 10 

samples 


G2 G11 G10 G5 G9 G6 

27 8 9 2 

3 53 27 3 

4 17 51 40 

1 8 18 12 

1 20 1 61 2 

8 6 24 

1 5 6 1 3 

1 

1 5 3 9 1 

1 

37 85 134 23 136 28 

G8 

1 

1 

4 

4 

1 

5 

59 

10 

85 

G7 G14 G3 - + 

2 51 52.9 41.6 64.0 

88 60.2 51.5 68.4 

4 122 41.8 34.7 49.2 

1 4 49 36.7 26.4 48.5 

1 88 69.3 60.8 76.7 

6 51 47.1 36.0 58.4 

1 13 89 66.3 57.7 73.9 

9 1 22 40.9 25.6 58.2 

40 59 67.8 57.2 76.8 

11 72 9 

1 9 11 81.8 57.3 93.8 

Producer 

accuracy/ 

omission error 

(%correct) 

90% 

confidence 

interval (-) 

NTF 

NTF 

73.0 62.4 38.1 78.3 44.9 85.7 

59.7 53.5 31.5 61.6 38.0 71.7 

69.4 

60.7 

81.8 55.6 100.0 

57.3 45.9 76.9 

Total number of samples: 

630 

Total correct: 351 

90% 

confidence 

interval (+) 

NTF 

83.1 70.5 45.1 89.0 51.9 93.4 

76.9 

93.8 64.8 100.0 


Key to group map class codes in Table H-2 

G2 

G3 

G5 

G6 

G7 

G8 

G9 

G10 

G11 

G14 

Colorado Plateau Mixed Bedrock and Tableland 

Colorado Plateau Pinyon-Juniper Woodland 

Inter-Mountain Basins Active and Stabilized Dune 

Inter-Mountain Basins Greasewood Flat 


Inter-Mountain Basins Wash 

Inter-Mountain Basins Semi-Desert Grassland 

Inter-Mountain Basins Semi-Desert Shrub-Steppe 

Inter-Mountain Basins Shale Badland 

Southern Colorado Plateau Sand Shrubland 

H5


Table H-3. Contingency table: Macrogroup map classes. 


Map 

code 

MG2 

MG8 

MG5 

MG6 

MG9 

MG7 

MG12 

MG3 

Number of 

samples 

Producer 

accuracy/ 

omission error 

(%correct) 

90% 

confidence 

interval (-) 

90% 

confidence 

interval (+) 


MG2 MG8 MG5 MG6 MG9 MG7 MG12 MG3 

2 27 19 1 2 

4 5 277 2 6 4 

1 21 18 4 1 4 

2 14 24 5 6 

1 14 1 59 1 13 

1 1 10 9 1 

1 14 3 1 40 

1 1 9 

10 35 359 22 28 85 11 71 9 

NTF 77.1 77.2 81.8 85.7 69.4 81.8 56.3 100.0 

NTF 63.8 73.3 65.1 71.7 60.7 57.3 46.6 76.9 

NTF 86.6 80.6 92.6 93.4 76.9 93.8 65.6 100.0 

Number of samples 

User accuracy/commission 

error (% correct) 

90% Confi dence intervals 

- + 

51 52.9 41.6 64.0 

88 60.2 51.5 68.4 

122 41.8 34.7 49.2 

49 36.7 26.4 48.5 

88 69.3 60.8 76.7 

51 47.1 36.0 58.4 

89 66.3 57.7 73.9 

22 40.9 25.6 58.2 


630 



Key to macrogroup map class codes in Table H-3 

MG2 Colorado Plateau Mixed Bedrock and Tableland 

MG3 Colorado Plateau Pinyon-Juniper Woodland 

MG5 Inter-Mountain Basins Active and Stabilized Dune 

MG6 Inter-Mountain Basins Greasewood Flat 

MG7 Inter-Mountain Basins Riparian Woodland and Shrubland 

MG8 Inter-Mountain Basins Semi-Desert Grassland and Steppe 

MG9 Inter-Mountain Basins Wash 

MG12 Southern Colorado Plateau Sand Shrubland 

H6

Table H-4. Contingency table: Management map classes. 


Number of 

samples 

User accuracy/ 

commission error 

(% correct) 

90% 

Confi dence 

intervals 

H7 

Map 

code 

MN6 MN7 MN23 MN19 MN20 MN3 MN4 MN24 MN2 MN5 MN11 MN9 MN10 MN21 MN12 

MN6 6 

MN7 8 2 2 

MN23 3 63 6 2 8 1 4 

MN19 1 10 1 4 2 2 

MN20 2 

MN3 1 5 66 2 17 2 

MN4 6 17 1 

MN24 1 3 1 59 5 1 1 13 

MN2 2 6 7 10 6 119 7 2 1 3 

MN5 9 6 

MN11 2 5 14 24 6 

MN9 2 

MN10 1 

MN21 4 1 10 3 1 40 

MN12 1 1 9 

Number of samples 9.0 6.0 9.0 81.0 18.0 2.0 91.0 20.0 73.0 186.0 22.0 28.0 3.0 1.0 72.0 9.0 

Producer 

NTF 100.0 88.9 77.8 55.6 100.0 72.5 85.0 80.8 64.0 27.3 85.7 66.7 100.0 55.6 100.0 

accuracy/omission 

error (%correct) 

90% confidence NTF 68.9 62.3 69.0 36.9 42.5 64.6 67.8 72.2 58.0 14.8 71.7 25.4 27.0 45.9 76.9 

interval (-) 


interval (+) 

NTF 100.0 97.5 84.2 72.8 100.0 79.5 93.8 87.2 69.5 44.7 93.4 92.2 100.0 64.8 100.0 



- + 

6 100.0 68.9 100.0 

12 66.7 43.1 84.1 

87 72.4 63.9 79.5 

20 50.0 32.7 67.3 

2 100.0 42.5 100.0 

93 71.0 62.7 78.0 

24 70.8 54.1 83.3 

84 70.2 61.5 77.7 

163 73.0 66.9 78.3 

15 40.0 22.3 60.7 

51 47.1 36.0 58.4 

2 100.0 42.5 100.0 

1 100.0 27.0 100.0 

59 67.8 57.3 76.8 

11 81.8 57.3 93.8 


630 


Appendix H: Accuracy Assessment Data


Key to management map class codes in Table H-4 

MN2 

MN3 

MN4 

MN5 

MN6 

MN7 

MN9 

MN10 

MN11 

MN12 

MN19 

MN20 

MN21 

MN23 

MN24 

Alkali Sacaton Steppe and Mixed Grasslands 

Badland Sparse Vegetation 

Barren Wash 

Blue Grama Steppe and Mixed Grasslands 


Cliff-rose - Crispleaf Buckwheat Shrubland 

Cottonwood / Rubber Rabbitbrush Woodland 


Greasewood Flats 

One-seed Juniper / Bigelow’s Sagebrush Shrubland 


Sand / Mudflat 

Sandsage - Fourwing Saltbush Colorado Plateau 



H8

The Department of the Interior protects and manages the nation’s natural resources and cultural heritage; provides scientific and 

other information about those resources; and honors its special responsibilities to American Indians, Alaska Natives, and affiliated 

Island Communities. 

NPS 110/100710, November 2009




1201 Oak Ridge Drive, Suite 150 

Fort Collins, Colorado 80525 

www.nature.nps.gov 

EXPERIENCE YOUR AMERICA

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