Perennial, tufted. Culms weak, erect to decumbent and rooting at lower nodes, 40–100 cm tall, 4(–8)-noded. Leaf sheaths smooth, loose; leaf blades linear to lanceolate, flat, thin, 5–14 cm × (2.5–)4–11 mm, both surfaces scaberulous, margins finely scabrid; ligule 2–3(–6) mm, back scabrid, apex truncate, lacerate. Panicle effuse, 10–15(–20) cm, usually narrowly oblong in outline when young, spreading at flowering, usually contracted in fruit; branches several at each node, capillary, up to 10 cm, bare in lower part. Spikelets 1.3–1.8(–2.2) mm, olive green, occasionally violet tinged; glumes narrowly lanceolate-oblong, lower glume usually slightly longer than upper, sometimes equal, keeled, keel scabrid to aculeate, apex subacute; callus glabrous or nearly so; lemma 3/4–9/10 spikelet length, awnless, apex obtuse; palea 0.3–0.6 mm, (1/4–)1/3(–1/2) lemma length. Anthers 0.3–0.5(–0.7) mm. Fl. and fr. Jul–Sep.
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