Distribution: Occurring chiefly east of the Cascades crest in Washington; southern Britich Columbia to California, east to northwestern Montana and Utah.

Habitat: Plants amphibious, in and around temporary lakes and pools, generally at low to middle elevations.

Origin: Native

Growth Duration: Perennial

Conservation Status: Review Group 1 in Washington (WANHP)

Perennial herb, aquatic to terrestrial; rootstock buried and corm-like, nearly globose, with 2 lobes, corky, brown.

Leaves deciduous, simple, in tufts somewhat resembling grass, spirally arranged on top of stem, erect to spreading, rigid but not brittle, up to 25 cm, linear above base, tapered to apex, bright green with pale to brown or shiny black base.

Sporangia solitary, embedded in enlarged leaf base, less than 1 cm, less than 3/4 covered by a translucent membrane, male or female; male spores less than 10,000, 0.025-0.035 mm, somewhat bean-shaped, brown in mass; female spores 20-200, 0.3-0.5 mm, spheric, white, ridged.