Equisetum mackaii... www.plantsystematics.org

Equisetum x mackaii | Idaho... idfg.idaho.gov

Plants of Iceland:... www.iceland-nh.net

University of Colorado... botanydb.colorado.edu

Equisetum mackaii... www.plantsystematics.org

CCH2 Portal - Equisetum ×... www.cch2.org

Equisetum variegatum... www.minnesotawildflowers.in...

Variegated Scouring-rush... www.thismia.com

Horsetails of Britain and... www.delta-intkey.com

Horsetail (Equisetum) |... idfg.idaho.gov

Equisetum hyemale (tall... gobotany.nativeplanttrust.o...

NEON Biorepository Data... biorepo.neonscience.org

Equisetum variegatum... www.minnesotawildflowers.in...

Equisetum hyemale (tall... gobotany.nativeplanttrust.o...

Equisetum × trachyodon -... en.wikipedia.org

Distribution (A), frequency... www.researchgate.net

Equisetum praealtum (Tall... www.minnesotawildflowers.in...

File:Equisetum × mackaii... en.m.wikipedia.org

Equisetum in Flora of North... www.efloras.org

2013 BONAP North American... bonap.net