Perennial, tufted. Culms 30–60 cm tall, 2–3-noded. Basal leaves 1/2–2/3 length of culms; leaf sheaths smooth or margins ciliate, longer than internodes; leaf blades setaceous, up to 35 cm, 0.3–0.5 mm in diam., outer surface scabrid at least in apical part; ligule of basal leaves 0.2–0.5 mm, rounded, ciliate, of culm leaves 1–2 mm. Panicle narrow, 10–20 cm, base enclosed by uppermost leaf sheath. Spikelets yellowish green; glumes subequal, linear-lanceolate, 2–3 cm, apex attenuate into hyaline filament; callus pungent, 1.5–2 mm; lemma 8–10 mm, pubescent, densely in lower part and sparsely in upper part, a ring of short hairs at apex; awn deciduous, 15–20 cm, 2-geniculate, column 2–3 cm to first bend, smooth, glossy, 1–1.5 cm to second bend, bristle 8–15 cm, plumose, hairs 2–3 mm. Fl. and fr. May–Jul. 2n = 44.
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