Slender, shortly rhizomatous perennial. Culms erect or geniculate, 18–91 cm high; basal internodes swollen, usually moniliform; mid-culm internodes glabrous, terete. Leaves basal and cauline; basal sheaths with margins connate in lower 1/3–1/2, glabrous or scabrous to puberulous, usually minutely and retrorsely pubescent around the swollen internodes, often purplish; ligule 1.7–7.2 mm long, acute to obtuse, apically glabrous, abaxially glabrous or sparsely hairy; blade flat or channelled, 7.5–30 cm long, 1.5–4.3 mm wide, narrowly channelled and hooded at apex, adaxially glabrous or scabrous, abaxially scabrous or puberulous on veins. Panicles 5–21.5 cm long, usually with widely spreading capillary branches. Spikelets 3.4–7.4 (–14.5) mm long (and often nearly as wide at maturity), usually plump, ±pendent, with (2–) 4–9 (–14) bisexual florets. Glumes 2.3–3.6 (–7) mm long, 3 (–5)-nerved. Web not or weakly developed. Lemma 2.8–4.3 (–7.2) mm long, very obtuse to truncate, 5 (–7)-nerved; midnerve and marginal nerves ciliate or thinly villous in lower half; intercostal regions glabrous or rarely puberulous. Anthers 1.7–2.6 (–4.4) mm long.
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