Perennial, densely tufted with a short rhizome. Culms 40–80 cm tall, 1–2 mm in diam., internodes and nodes glabrous. Leaf sheaths smooth, glabrous, shorter or longer than intermodes, margins membranous, sometimes ciliate, especially at mouth; leaf blades linear, stiff, often involute, 5–15(–20) cm × 4–6 mm, glabrous on both surfaces; ligule 0.4–0.7 mm. Panicle narrow, 4–15 cm; central axis scabrid-hispidulous; branches 2–6 cm, erect or narrowly ascending; usually solitary; pedicels 1–3 mm, scabrid. Spikelets 3.5–4.5 mm, purplish; glumes smooth or almost so along veins; lower glume 2.6–3.5 mm, 5-veined; upper glume 5-veined; lower floret staminate; upper floret 2.6–3.4 mm, lemma shortly awned; awn straight, 0.3–1.5 mm; callus hairs usually ca. 1/2 length of lemma. Fl. and fr. Jul–Nov.
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