Caespitose perennial. Culms slender, 25–75 cm high; mid-culm internodes scabrous to puberulous below nodes or glabrous. Young shoots usually intravaginal. Leaves: basal sheaths with margins connate in lower 1/3, densely scabrous to puberulous, pallid; ligule 0.4–2.1 mm long, truncate, apically ciliolate, abaxially pubescent; blade involute, 4.5–19.5 (–30) cm long, 0.3–0.75 mm wide, rather stiff, adaxially densely scabrous to puberulous, abaxially scabrous to subvelutinous (with hairs equal, to c. 0.3 mm long, dense, ±stiff, spreading to somewhat antrorse). Panicles open or slightly contracted, (5–) 12–15 cm long. Spikelets 3.4–5.8 mm long, with 2–5 bisexual florets. Glumes: lower glume 2.3–2.6 mm long, (1–) 3-nerved; upper glume 2.6–3 mm long, 3-nerved. Web absent or weakly developed. Lemma 2.5–3.5 mm long, 5-nerved, puberulous in lower half with longer hairs along midrib. Anthers 1.4–1.8 mm long.
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