Perennial from short knotty rootstock. Culms tufted, erect, 50–100 cm tall, nodes glabrous or pilose. Leaf sheaths keeled, hirsute; leaf blades linear, 10–25 × 0.5–0.8 cm, hirsute on both surfaces, rarely glabrous, apex acuminate; ligule 0.5–1.5 mm. Inflorescence axis 1–9 cm; racemes 2–6, 3–10 cm, laxly ascending or spreading, axils pilose; spikelets commonly paired at least in central part of raceme or a vestigial 2nd spikelet present; rachis ca. 1 mm wide, margins scaberulous; pedicels minutely puberulous. Spikelets elliptic to orbicular-elliptic, plumply plano-convex, 2.5–3 mm, rounded or subacute; upper glume membranous, 3-veined with laterals marginal, sparsely pubescent especially along margins; lower lemma similar but glabrous; upper lemma pallid, as long as spikelet, coriaceous, punctulate-striate, obtuse. Fl. and fr. May–Oct. 2n = 20, 40.
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