Usually rather weakly caespitose perennial, sometimes developing leafy aerial or trailing stolons. Culms 40–120 cm high; mid-culm internodes glabrous, slightly compressed. Young shoots extravaginal. Leaves: basal sheaths with margins connate in lower 2/3 but soon splitting, glabrous or minutely scabrous; ligule 0.4–1.1 (–2) mm long, obtuse to truncate, apically obscurely ciliolate, abaxially puberulous; blade flat, 10–30 cm long, 1.5–5 mm wide, adaxially scabrous or minutely puberulous, abaxially minutely scabrous on the prominent nerves. Inflorescence open to slightly contracted, 21–22.5 cm long. Spikelets 3.8–4.7 mm long, with (2–) 3–5 (–7) bisexual florets. Glumes: lower glume 1.9 mm long, 1 or 3-nerved; upper glume 1.9–2.2 mm long, 3-nerved. Web absent or present. Lemma 2.6–2.7 (–3.6) mm long, 5-nerved, puberulous in lower half with longer hairs on midnerve and marginal nerves, very rarely intercostal regions glabrous. Anthers 1.8–2 mm long.
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