Plants dioecious, rhizomatous or stoloniferous, perennial. Culms mat forming, glabrous; internodes solid (much branched),
terete. Leaves cauline, distinctly distichous; sheaths terete, margins open; auricles absent; ligules a ciliate
membrane; blades less 1 cm long, folded or involute, pungent, stiff. Infloresence a single spikelet in axils of
upper sheaths. Spikelets unisexual, solitary, laterally compressed, awnless, sessile; disarticulation above glumes; florets
3 - 5, callus glabrous; reduced floret at apex; glumes absent (rarely 1); lemmas 7 - 9-veined, coraiceous (staminate) or indurate
(pistillate), entire, awnless, glabrous, veins glabrous; paleas 2-veined, awnless, glabrous. Staminate plants, stamens 3; anthers yellow.
Pistillate plants, caryopses terete. Base chromosome number x=10.
A genus of three species native to the New World. Adapted to saline marshes or flatlands near or on the coast.