Perennial; basal sheaths orange inside, lax, curling when dry. Culms tufted, slender, 50–100 cm tall, 1–2.5 mm in diam., nodes glabrous or puberulous, often farinose. Leaf sheaths smooth, glabrous; leaf blades linear, 15–40 × 0.3–0.5 cm, glabrous, margins scabrid, base gradually narrowed, apex finely acuminate; ligule 1–3(–4.5) mm. Spathate compound panicle narrow, 15–30 cm, 2 tiers of branching; spatheoles 1.5–2.2 cm; racemes often purplish, (1.3–)1.5–2 cm, rachis internodes and pedicels 2–3.5 mm, margins ciliate; pedicel of homogamous pair not swollen. Sessile spikelet narrowly obovate, 4.5–6 × 1.2–1.7 mm; lower glume flat or slightly concave toward base, smooth or slightly wrinkled, sharply 2-keeled throughout, keels broadly winged above middle, wings 0.25–0.45 mm wide, (1–) 3–5-veined between keels; upper lemma 2-lobed; awn (0.8–)1–2 cm. Pedicelled spikelet 4–6.5 mm. Fl. and fr. Jul–Oct. 2n = 20.
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