Culms 8–12 dm, often decumbent and rooting from the lower nodes; lvs 2–5 mm wide; ligule 4–12 mm; infl slender, 2–5 dm, the branches 8–12 cm, each with several appressed spikelets; spikelets 1–2 cm, 8–12-fld, at first cylindric, the lemmas tending to spread at maturity; rachilla-joints 1–1.3 mm; glumes elliptic, rounded at the tip, soon scarious, obscurely veined, the first 1.1–2.1 mm, the second 1.9–3.3 mm; lemmas obtuse, scarious at the margins and tip, 3.1–3.9 mm, green and shining between the minutely scaberulous veins; palea not projecting; anthers 3, 0.6–1 mm; grain 1–1.2 mm; 2n=20. In shallow water and wet soil; Nf. to Alas., s. to Conn., N.J., Ind., Io., Nebr., and Calif.
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