2 species
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Hippuris montanamountain mare's-tail
Distribution: Chiefly west of the Cascades in Washington; Alaska to Washington, east to Northwest Territories and Alberta.
Habitat: Wet meadows, streams and mossy banks in the moungtains
Origin: Native
Flowers: July-September
Growth Duration: perennial
Hippuris vulgariscommon mare's-tail
Distribution: Widely distributed on both sides of the Cascades in Washington; Alaska to south California and New Mexico, east through southern Canada and the northern states to Maine.
Habitat: Streams, ponds and shallow lakes, generally at least partially emerged.
Origin: Native
Flowers: June-August
Growth Duration: perennial