Distribution: Occurring on both sides of the Cascades crest in Washington; widespread in North America.
Habitat: Streambanks and other wet places in the valleys and lowlands; tolerant of alkali.
Growth Duration: Annual
Conservation Status: Not of concern
Tufted annual, the triangular, solid, slender stems 0.5-2 dm. tall.
Leaves few, grass-like, all attached near the base, slender and elongate, 0.5-2 mm. wide, the sheaths closed.
Inflorescence of spikelets in 1-several capitate clusters, the primary cluster sessile, the others on slender rays up to 3 cm. long in the axils of sheathless, leafy, unequal involucral bracts, at least one surpassing the inflorescence; spikelets 3-15 mm. long; scales of the spikelets in 2 vertical rows, 2-2.5 mm. long, blunt, with a pale mid-rib; perianth none; stamens usually 2; style deeply bifid.
Achenes lenticular, 1.0-1.3 mm. long, olivaceous to blackish.