Perennial, tufted. Culms erect, 25–60 cm tall, nodes glabrous. Leaves mostly basal; leaf sheaths pilose to hispid; leaf blades linear, flat, 12–50 × 0.3–0.8 cm, pilose, base narrowed, apex acuminate; ligule a ciliate collar. Panicle oblong in outline, 10–30 cm, moderately branched; pedicels pilose. Spikelets ovate, 3–4 mm, glabrous, acuminate, upper glume and lower lemma divergent at maturity; lower glume ovate, 1/2–2/3 length of spikelet, 3–5-veined, acuminate, separated by an internode; upper glume ovate, as long as spikelet, 7-veined, acuminate; lower floret barren, lemma similar to upper glume, palea poorly developed; upper floret pale yellow, rarely black, smooth, shiny. Fl. and fr. May–Oct. 2n = 36.
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