Distribution: Coastal from Southern British Columbia south to northern Mexico.
Habitat: Usually in brackish to saline water of marshes, beaches, and shores.
Flowers: June - August
Growth Duration: Annual
Conservation Status: Not of concern
Tufted annual with numerous slender stems 3-20 cm. tall.
Leaves few, near the base, variable, sometimes with normal sheath and elongate, slender blade, sometimes the lower leaves reduced to bracts and the upper one with a sheath and very short blade.
Inflorescence a solitary spikelet 2-5.5 mm. long with several perfect flowers, sub-terminal, at an angle to the culm, with a single involucral bract up to 1 cm. long; flowers subtended by scales 1.5-2 mm. long, often purplish, with parallel nerves, the mid-rib greenish or pale; perianth bristles none; stamens 3; style trifid.
Achenes triangular, about 1 mm. long.