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Polygonum paronychia (Beach Knotweed)
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Polygonum paronychia
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Beach Knotweed
( Polygonum paronychia )
Polygonum paronychia
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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6 Nurseries Carry This Plant
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About Beach Knotweed (Polygonum paronychia)
6 Nurseries Carry This Plant
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Polygonum paronychia
is a species of flowering plant in the knotweed family known by the common names dune knotweed, black knotweed, and beach knotweed. It is native to the coastline of western North America from British Columbia to California, where it grows in sandy coastal habitat such as beaches, dunes, and scrub.
Polygonum paronychia
is a small prostrate or upright shrub producing multibranched brown stems up to a meter (40 inches) long. The stems may root at nodes that come in contact with moist substrate. The leaves are alternately arranged on the stems but are mostly located bunched around the tips of the stem branches. The leaves are linear to lance-shaped with rolled edges and bristly midribs on the undersides. Each leaf has a large stipule which forms a wide, membranous ochrea. The ochrea is up to 2 centimeters (0. 8 inches) long and is persistent, fraying into fibrous, silvery shreds that remain on the plant through the seasons. Flowers occur in the leaf axils. Each is up to a centimeter (0. 4 inches) wide with five narrow white or pinkish corolla lobes.
Polygonum paronychia
is a small prostrate or upright shrub producing multibranched brown stems up to a meter (40 inches) long. The stems may root at nodes that come in contact with moist substrate. The leaves are alternately arranged on the stems but are mostly located bunched around the tips of the stem branches. The leaves are linear to lance-shaped with rolled edges and bristly midribs on the undersides. Each leaf has a large stipule which forms a wide, membranous ochrea. The ochrea is up to 2 centimeters (0. 8 inches) long and is persistent, fraying into fibrous, silvery shreds that remain on the plant through the seasons. Flowers occur in the leaf axils. Each is up to a centimeter (0. 4 inches) wide with five narrow white or pinkish corolla lobes.
Plant Description
Plant Type
Perennial herb
Size
0.33 - 3.3 ft tall
Flower Color
White, Red
Flowering Season
Spring, Summer, Fall
Wildlife Supported
Butterflies & moths hosted ( 1
confirmed
, 15
likely
* )
SHOW ALL
Buckwheat Borer Moth
Synanthedon polygoni
Synanthedon polygoni
*
Gray Hairstreak
Strymon melinus
Strymon melinus
*
Acmon Blue
Icaricia acmon
Icaricia acmon
*
Purplish Copper
Lycaena helloides
Lycaena helloides
*
White-lined Sphinx
Hyles lineata
Hyles lineata
*
Subterranean Dart
Feltia subterranea
Feltia subterranea
*
Western Yellowstriped Armyworm
Spodoptera praefica
Spodoptera praefica
Landscaping Information
Sun
Full Sun, Part Shade, Full Shade
Moisture
Extremely Low, Very Low
Nurseries
Carried by 6
Soil Drainage
Fast
Common uses
Groundcovers, Deer Resistant
Propagation
?
For propagating by seed: No treatment.
Sunset Zones
?
4, 5, 14, 15, 16*, 17*, 19, 20, 21, 22*, 23*, 24*
Natural Setting
Site Type
Dunes
Climate
Annual Precipitation: 12.4" - 81.0", Summer Precipitation: 0.17" - 2.79", Coldest Month: 42.1" - 53.6", Hottest Month: 56.5" - 74.9", Humidity: 0.01" - 23.31", Elevation: 2" - 4336"
Alternative Names
Common Names
: Black Knotweed, Dune Knotweed
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Beach Knotweed
Polygonum paronychia
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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