Distribution: Chiefly west of the Cascades, southern Alaska to southern Oregon; also in northern Idaho, northwest Montana, and eastern United States.
Habitat: Quiet, shallow water 2-8 dm. deep,
Flowers: July - August
Conservation Status: Not of concern
Aquatic perennials from rhizomes, the slender, weak, sub-terete stems 20-80 cm. long.
Leaves elongate, weak, from near the base, the upper portion usually floating, or the plant occasionally terrestrial with erect stem and leaves.
Inflorescence a solitary, light brown spikelet 7-12 mm. long, subtended by a bract 1.5-6 cm. long that looks like a continuation of the stem; flowers subtended by thin translucent scales 4-6 mm. long; perianth of 2-6 bristles about equal to the achene; stamens 3; style trifid.
Achenes triangular, 2.5-3.8 mm. long, including the slender beak.