Caespitose perennial. Culms erect, 40–90 cm high; basal internodes often swollen, forming elongate or globular yellow nodules; mid-culm internodes sparsely puberulous. Young shoots extravaginal or intravaginal. Leaves: basal sheaths with margins connate in lower half, scabrous, puberulous or pubescent; ligule 0.4–2 (–3.5) mm long, obtuse or truncate or rarely long-acute, apically glabrous or ciliolate, abaxially shortly hairy; blade usually folded or involute or rarely flat, 9–25 cm long, 0.9–1.3 mm wide, adaxially scabrous to puberulous, abaxially scabrous to puberulous to pilose. Panicles open or contracted, 9–24 cm long. Spikelets 5.1–7.2 mm long, with 3–6 bisexual florets. Glumes 3-nerved; lower glume 2.1–2.6 mm long; upper glume 2.6–3 mm long. Web absent to well-developed. Lemma (2–) 3–4 mm long, 5-nerved, usually rather broad and obtuse; nerves pubescent to villous in lower half; intercostal regions usually puberulous or sometimes glabrous. Anthers 2–2.2 mm long.
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