Slender rhizomatous perennial, with single shoots or sometimes loosely fascicled. Culms (20–) 45–100 cm high, often curved and ascending at base; mid-culm internodes scabrous immediately below node or glabrous, usually compressed. Young shoots extravaginal. Leaves: basal sheaths with margins connate in lower 2/3 or for entire length, glabrous or minutely scabrous, rarely purplish; ligule 1.7–4.3 (–5) mm long, obtuse or truncate, apically glabrous, abaxially glabrous or scabrous or puberulous; blade mostly flat but channelled and narrowly hooded at apex, 5–20 (–30) cm long, 1.5–5 mm wide, adaxially minutely scabrous, abaxially glabrous. Panicles relatively narrow, 10.5–24 (–45) cm long, with branches finally spreading or reflexed. Spikelets 5–12.4 mm long, with 3–12 bisexual florets. Glumes: lower glume 2.8–4.5 mm long, 3-nerved; upper glume 3–4.7 mm long, 3 (–5)-nerved. Web not or hardly developed. Lemma (2.5–) 3–5.1 mm long, 5-nerved, membranous and very obtuse at apex, pubescent in lower half, with hairs longer on keel and marginal nerves; intercostal regions rarely glabrous. Anthers 1.5–3 mm long.
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