Shortly rhizomatous perennial. Culms stiffly erect, 60–100 cm tall, 2–5 mm in diam., unbranched. Leaf sheaths usually thinly pilose, a ring of short hairs externally at junction with blade; leaf blades tough, 30–60 cm, 3–14 mm wide, midvein convex on abaxial surface, adaxial surface paler, glabrous or thinly pilose, apex acuminate; ligule 0.5–1 mm. Panicle 15–40 cm, open; primary branches ascending, branched from base, spikelets loosely appressed to secondary branches. Spikelets 6.5–10 mm, with 3–5 spaced florets, uppermost floret reduced, smooth, glossy; rachilla internodes 1.5–2 mm, puberulous, often with longer hair-tuft at apex; glumes much shorter than lowest lemma, 3-veined; lower glume ovate, 2–4 mm, acute; upper glume elliptic-ovate, 3–5 mm, subacute; callus hairs 1–2 mm; lemmas ovate-oblong, 4–7 mm, inconspicuously 3-veined, subacute; palea ciliolate along upper keels. Anthers 2–3 mm. Fl. and fr. Jul–Aug. 2n = 50.
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