Stems creeping and forming mats, or ascending to erect and branched from the base, 2–5 dm, glabrous; sheaths loose, glabrous, often purplish; blades linear, glabrous, 3–10 cm × 2–4 mm; panicle often overtopped by the uppermost lvs; racemes 2–5, 2–3 cm; rachis to 4 mm wide, ± folded over the spikelets, ending in a spikelet; spikelets solitary, crowded, elliptic to obovate, glabrous, 1.7–2.1 mm, two-thirds as wide; glume and sterile lemma 3–5-veined; 2n=40. Shallow water and muddy shores on the coastal plain from s. N.J. to Fla. and Tex., n. in the Mississippi Valley to s. Ill. and s. Mo.; Cuba.
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