Perennial; culms glabrous, to 1 m or more, rooting from the lower nodes and often decumbent at base; sheaths ciliate distally, the lower often densely papillose-hirsute; ligule a band of hairs 2–3 mm; blades elongate, 6–10 mm wide, glabrous or the lower papillose-hirsute; panicles solitary, 8–15 cm; spikelets glabrous, 4–4.7 mm; first glume 1–1.4 mm; 2n=36. Swamps, ditches, and muddy ground, chiefly on the coastal plain, occasionally inland; s. N.J. to Fla., Tenn., Okla., Tex., and the W.I.