Perennial, loosely tufted, scaly buds at base. Culms erect, 60–150 cm tall, 1.8–3 mm in diam., 3–4-noded. Leaf sheaths smooth, lower longer than internodes; leaf blades linear or broadly linear, flat or margins inrolled, 20–50 cm, 4–10 mm wide, abaxial surface smooth, adaxial surface and margins scabrid, apex finely acuminate; ligule truncate, 1–1.5 mm. Panicle open, sometimes effuse, 12–40 cm; branches 2–4 per node, bare below middle. Spikelets 8–13 mm, yellowish green or purplish; glumes subequal or lower glume slightly longer, elliptic-oblong, 3-veined, smooth, glabrous, apex of lower glume acuminate, of upper glume acute or denticulate; callus obtuse, 0.3–0.5 mm; lemma narrowly lanceolate, 5–7 mm, leathery, pilose, hairs slightly longer upward, 0.6–1.2 mm at awn base, margins overlapping and enclosing palea, apex very shortly toothed; awn persistent, stiff, 2–3 cm, 1-geniculate, column twisted, minutely hispidulous, bristle scabrid. Anthers 4–6 mm, bearded at apex. Fl. and fr. Jul–Oct.
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