Glabrous to pubescent perennial, often with elongate rhizomes, the culms 3-10 dm. high; leaves narrow, stiff, the bases indurate and castaneous or blackish; spike-lets few or numerous, 1-1.5 cm. long, the scales obtuse, glabrous or puberulous, apiculate, dark brown with paler veins imbedded in the tissue; achene biconvex, Dbovate, with deep-pitted horizontally elongated cells, and narrowed at the base to a minute purplish annulus.
In wet soil about streams or swamps, most often in saline flats along the seacoast, ascending to about 1,200 metres.
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