Perennial, densely tufted. Culms 15–50 cm tall, 0.7–1 mm in diam., 1–2-noded. Leaf blades setaceous, up to 20 cm, abaxial surface smooth or scabrid; ligule triangular or lanceolate, 1–3 mm. Panicle open, ovate in outline, 6–10(–14) × 2–6 cm; branches usually single, rarely paired, dichotomously branched, sometimes with prominent axillary cushions, filiform, bare in lower part; pedicels slender, 5–15 mm. Spikelets purplish or gray-brown, whitish at apex; glumes elliptic, 4.5–6.5 mm, 3-veined, apex usually smooth, obtuse to acute; lemma 3.6–5.2 mm, pilose below middle, scabrid or minutely pubescent above; awn 1–2 cm, column twisted, plumose, hairs 1.2–3 mm below bend, shorter above; palea equal to lemma, 2-veined. Anthers 1–2 mm, bearded at apex. Fl. and fr. Jul–Sep.
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