Culms 10–15 dm, rather soft, often decumbent and rooting from the lower nodes; main lvs 6–10 mm wide; ligule prominent; infl narrow, 2–4 dm, often somewhat spreading at anthesis; spikelets subsessile or short-pedicelled, 1–2 cm, 8–16-fld, the lemmas spreading at maturity; rachilla-joints 1.1–1.8 mm; glumes scarious, obscurely veined, elliptic to obovate, the first 1.9–3.9 mm, the second 2.8–5.1 mm; lemmas elliptic, 3.7–5.3 mm, dull and scaberulous between the veins, blunt or rounded and usually erose at the scarious tip; palea sometimes projecting as much as 1 mm; anthers 3, 1–1.7 mm; grain 1.5–2 mm; 2n=40. Shallow water or very wet soil; Mass. to Minn., s. to S.C. and Tex. (G. arkansana, a rare form with the lemmas minutely short-hairy instead of scabrous)
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