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Stout, erect, 10–18 dm; lvs 5–10 mm wide, elongate to a slender tip; ligule firm, 3–5 mm; panicle 1–2 dm, the branches ascending, bearing spikelets mostly above the middle, the lowest ones much elongate; spikelets 7–11 mm; glumes lanceolate, appressed, the first 5–7.5 mm, the second 6.5–10 mm; lemmas usually lacerate at the tip and with minutely projecting veins, the lowest 6–7 mm, the upper considerably smaller; 2n=28. Marshes and shallow water; n. Eurasia and nw. N. Amer., s. and e. to Oreg., Mont., Kans., and Io. (Fluminia f.)
