Perennial from a knotty rootstock. Culms loosely tufted, erect, wiry, 40–150 cm tall, upper internodes keeled, hirsute along keel, nodes glabrous. Leaf sheaths glabrous or thinly hirsute near mouth; leaf blades linear, 20–50 × 0.2–0.5 mm, glabrous or abaxial surface hirsute, apex finely acuminate; ligule truncate, 0.5–1 mm, margin ciliolate. Raceme 1–4 cm, purplish; spatheole narrow, glabrous or sparsely hirsute; rachis internodes and pedicels filiform, ca. 2/3 length of sessile spikelet, white-ciliate. Sessile spikelet 3.6–6 mm; callus obtuse, ca. 0.5 mm; lower glume narrowly lanceolate-oblong, leathery, glossy, back convex to almost flat, minutely asperulous, 5-veined, flanks keeled and narrowly winged above middle, wings ciliolate, apex erose; upper lemma 2-lobed in upper 1/4–1/3; awn 0.6–1 cm. Pedicelled spikelet male or barren, 4–5.3 mm, elliptic-oblong, papery, flat, back 3-veined, margins keeled and ciliolate above middle, apex acute. Fl. and fr. Jun–Nov.
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