Perennials, shortly rhizomatous, rhizomes yellowish orange to reddish brown, slender. Plants yellowish green. Culms 35–90 cm tall, 3–4 mm in diam., nodes 2 or 3, uppermost node ca. 1/2 way up, often slightly scabrid below the panicle and nodes. Leaf sheaths compressed, keeled, 10–20 cm, lower ones distinctly retrorsely hispidulous, uppermost closed for 1/3 of length; blade flat or infrequently folded, moderately thin, 8–15 cm × (1.5–)3–5 mm, adaxial surface of basal blades sparsely pilulose; ligules 2–3.5 mm, apex ciliolate, abaxially sparsely puberulent. Panicle open, oblong, 8–20 cm; branches ascending, spreading in anthesis, scabrid throughout, longest 3–5 cm with 3–10 spikelets in distal 1/2. Spikelets green, 3.5–6 mm, florets 2–4; vivipary absent; glumes strongly keeled, keel almost straight, keel and lateral veins moderately densely scabrid, surface sometimes moderately scabrid above, 3-veined, apex acuminate, lower glume 2–3 mm, upper glume 2.5–3.5 mm; lemmas lanceolate, 3.3–4.5 mm, keel and marginal veins with lower part sparsely pilulose, surfaces glabrous, finely minutely bumpy; callus webbed; palea glabrous between keels, keels scabrid. Anthers 1.8–2.4 mm. Fl. and fr. Jun–Jul. 2n = 70.
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