Culms erect, densely tufted, (25–)30–60(–75) cm tall, nodes 2–3(–5), uppermost to 1/3 way up culm. Shoots extravaginal. Leaf sheath scabrid, usually longer than blade; blade narrowly linear, flat or inrolled, 0.5–2.5(–3) mm wide, scabrid; ligules 1–3(–7) mm. Panicle contracted, narrow to spiciform, (4.5–)6–15(–17) × 1–3(–5) cm; branches erect, 1 or 2 per node, (1/5–)1/4–1/3(–1/2) × as long as panicle. Spikelets lanceolate, (3–)3.5–6(–7) mm, green or tinged with purple, apex yellow, ± violet; florets (2–)3–5(–7); rachilla warty, rarely pilose; glumes subequal, lanceolate to oblong-lanceolate, 3–4.2 mm; lemma oblong-lanceolate, 3.2–4 mm, keel usually shortly villous for 1/2 of length, marginal veins for 1/3, area between veins glabrous or pubescent; callus webbed to glabrous; palea glabrous or pubescent between keels. Anthers 1.3–2 mm. Fl. Jun–Aug.
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