General:
Perennial evergreen herbs from a thick, blackish rhizome.

Stems:
30-120 cm tall, 4-6 mm thick, dark green, their cental cavity more than 2/3 the stem diameter, not branched, the sheaths with 14-50 teeth that fall off leaving only darker traces.

Cones:
8-15 mm long, the tip tapered to a black-tinged point.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Equisetum hyemale var. affine (Engelm.) A.A. Eaton