Illustrator: Laurie Klingensmith

Copyright: Flora of North America Association

Aerial stems persisting more than a year, unbranched, 18–220 cm; lines of stomates single; ridges 14–50. Sheaths when mature dark-girdled, brown to gray above girdle, squarish in face view, 4.5–17 × 3.5–18 mm; teeth 14–50, articulate and promptly shed or persistent. Cone apex pointed; spores green, spheric. 2n =216.

Habitat: Moist roadsides, riverbanks, lakeshores, woodlands
Elevation: 0–3000 m

Distribution

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• Legacy Map

Alta., B.C., Man., N.B., Nfld., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska including the Aleutian Islands, all other states, Mexico, Central America in Guatemala.

Discussion

In southern and central to western regions plants tend to be taller and have more persistent teeth (Equisetum robustum, E. prealtum); in the Far West they often have bituberculate ridges (E. hyemale var. californicum). Equisetum hyemale subsp. hyemale is found in Europe and Asia to northwestern China in Xinjiang.

Selected References

None.

Lower Taxa

None.