Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.
Habitat: Sloughs and streams.
Flowers: July - September
Conservation Status: Not of concern
Small aquatic plants, emersed, the stems slender, 5-15 cm. long, with widely-spaced internodes.
Leaves all linear, 5-20 mm. long, 1-nerved, delicate, bright lustrous-green, inconspicuously white-margined, the tips bifid, the bases broadened but not forming ridges or wings on the stem between the bases.
Flowers imperfect, sessile in the leaf axils, each consisting of a single pistil or 1 stamen or both; styles 1-2 mm. long, soon deciduous; floral bracts wanting.
Carpels 1-2 mm. long, oval in outline, the margins narrowly winged above, the faces shallowly pitted.