Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.

Habitat: Calm water of lakes and slow streams.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Annual, perennial herb, slender, rhizomed; stems greater than 100 cm, branched, branches not many, cylindric.

Various shades of red; submersed sessile, 2-8 x 1-2 cm, lanceolate to elliptic-oblong, tapered to both ends, entire, tip blunt, veins 7-9; floating 0 or short-petioled, lanceolate, base tapered, veins 7-15; stipules beyond 3 cm, free, membranous, early-deciduous.

Inflorescence generally < 3 cm, floating to emergent; peduncle stiff.

Around 2.5 mm, keels 1 or 3, generally, beaked, sides concave to convex.