Elodea
ditchmoss, waterweed
2 species
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Elodea canadensisCanadian, Rocky Mountain, or common waterweed
Distribution: Throughout most of the United States
Habitat: Common in slow-moving, often alkaline water, in the Pacific Northwest
Origin: Native
Flowers: July - September
Elodea nuttalliiNuttall's waterweed, western waterweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California and Nevada, east to the Great Plains, midwestern U.S., and northeastern North America.
Habitat: Fresh to slightly brackish water of streams, rivers, lakes, ponds, and backwaters at low to middle elevations.
Origin: Native
Flowers: July - September