Loosely tufted, rather flaccid; branching extravaginal. Leaf-sheath submembranous, closed, keeled, striate, glabrous, often purplish, scattered cross-veinlets inconspicuous. Ligule 3.5-7 mm, hyaline, tapered to a point. Leaf-blade (4)-8-17 cm × 2.5-7 mm, folded at first, becoming flat, abaxially minutely papillose, striate, minutely scabrid on midrib and lateral ribs, adaxially glabrous, channelled on either side of midrib; margins scabrid, abruptly narrowed to stiff point. Culm (15)-25-45 cm, erect or ascending from curved, bent, or prostrate base, internodes glabrous. Panicle 20-30-(40) cm, narrow, with few spikelets, spiciform, ± secund, with 1-3 branches at lower panicle-nodes; rachis smooth, branches with a few minute prickle-teeth below spikelets. Spikelets 15-25-(30) mm, 8-14-flowered, narrowly oblong, greyish green or purplish. Glumes noticeably unequal, 1-nerved, hyaline, ovate-oblong, obtuse; lower 1.5-2.5 mm, upper 2.5-3.5 mm. Lemma 4-5.5 mm, 7-nerved, ovate-or elliptic-oblong, 3-lobed or 3-5-toothed, minutely papillose to short-scabrid, green and firm, nerves purple tipped extending into wide hyaline upper margin. Palea oblong-lanceolate or elliptic, deeply bifid into often purplish, aristate teeth, usually projecting slightly beyond lemma apex, keels narrowly winged, very minutely scabrid. Rachilla c. 1.5 mm, glabrous. Anthers (0.9)-1-1.4 mm. Caryopsis (1.7)-2-2.5 × 0.8-1 mm. Fig. 8.
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Rhizomatous and caespitose perennial, often rooting at lower nodes. Culms erect or ascending, 20–85 cm high. Leaves: lower sheaths prominently cross-veined; ligule 4.3–6.4 (–9) mm long, acute or obtuse, often toothed, soon shredding; blade 4.5–13.5 cm long, 4–12 mm wide, indistinctly cross-veined, adaxially minutely scaberulous, often glaucous. Inflorescences panicles or by reduction racemes, narrow and contracted, often interrupted, 4–40 cm long. Spikelets oblong, 13–27 mm long, with 8–15 bisexual florets; rachilla glabrous. Glumes obtuse, 1-nerved; lower glume oblong to ovate, 2.1–3.4 mm long; upper glume oblong, 3.8–5.5 mm long. Lemma broadly oblong to elliptic or ovate, 4.5–6 mm long, broadly obtuse, shallowly 3–5-toothed, dorsally rounded, with nerves reaching or nearly reaching apex, scaberulous. Palea slightly but distinctly exceeding lemma, prominently bidentate, glabrous. Anthers 1–1.3 mm long. Caryopsis dorsiventrally compressed, not grooved.
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