Perennial, tufted. Culms very slender, erect, 20–30(–50) cm tall, 0.5–0.8 mm in diam., 1–4-noded. Leaf sheaths loose, smooth; leaf blades narrowly linear to setaceous, flat or involute, 3–13 cm × 0.8–3 mm, abaxial surface smooth, adaxial surface scabrid; ligule 0.5–3 mm, back smooth or scaberulous, apex obtuse. Panicle open to laxly contracted, narrowly lanceolate to ovate in outline, 3–15 cm; branches 2–5 per node, very fine, ascending to spreading, 1–6.5(–8) cm, smooth or almost so, bare below middle. Spikelets 1.7–3.2 mm, dark purple or purplish green; glumes lanceolate, unequal, lower glume 1.7–3.2(–3.5) mm, keel scabrid above middle, long acuminate, upper glume 1.6–2.9 mm, apex acute; callus glabrous; lemma 2/3–4/5 spikelet length, awnless or a fine awnlet up to 0.6 mm below apex, apex obtuse or emarginate; palea 0.2–0.5 mm, 0.2–0.4 lemma length. Anthers 0.5–0.75 mm. Fl. and fr. Aug–Sep.
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