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Spikelets 6–25(30) × 2–3 mm, linear, strongly laterally compressed, 7–40(56)-flowered, the lemmas disarticulating from below upwards, the rhachilla persistent; glumes subequal, 1.7–2.7 mm long, reaching to about the middle of the adjacent lemmas, keeled, narrowly lanceolate in profile, asperulous along the keel above, otherwise glabrous, acute at the apex; lemmas 1.9–2.5(3.1) mm long, keeled, ovate in profile, membranous with distinct lateral nerves, diverging from the rhachilla at less than 45°, those in opposite rows not imbricate, the rhachilla visible between them, sometimes green but usually reddish-brown or purplish, asperulous on the keel, otherwise glabrous, acute to acuminate at the apex; palea persistent, glabrous on the flanks, the keels slender, narrowly winged, the wing margin entire, minutely ciliolate; anthers 2, 0.3–0.8 mm long.
Perennial, erect and densely tufted, up to 0.9 m high. Leaf blades up to 400 mm long, up to 5 mm wide. Basal sheaths glabrous to obscurely hairy at base. Spikelets 6-24 mm long, 2.0-2.5 mm wide. Inflorescence narrow, dense, branches appressed to main axis and overlapping but often distant in lower part; spikelets usually reddish brown, rhachilla persistent, lemmas and/or paleas breaking up from base upwards; lemma acute-acuminate, lateral nerves distinct but not raised; palea nearly the same width between keel and margins throughout, narrowing upwards and running into keel near apex, margins not touching, at least not in upper part, keels entire, broad and flattened; anthers 2, 0.3-0.7 mm long. Caryopsis broadly ellipsoid.
Tufted perennial; culms 30–100 cm. high, erect.. Leaf-blades flat or folded, up to 40 cm. long, 5 mm. wide, tapering to a filiform tip.. Panicle spike-like, cylindrical, often interrupted below, 4–22 cm. long, 1–3 cm. wide.. Spikelets 15–50-flowered, linear, 6–24 mm. long, 2–2.5 mm. wide, reddish brown, breaking up from the base, the rhachilla persistent; glumes lanceolate, subequal, 1.4–2.3 mm. long; lemmas broadly ovate, 1.5–3 mm. long, membranous, acute to acuminate; palea scaberulous on the keels, persistent; anthers 2, 0.3–0.7 mm. long.. Caryopsis broadly ellipsoid, 0.5–0.6 mm. long.. Fig. 64/4.
Densely caespitose perennial without rhizomes or stolons; culms up to 90(120) cm tall, erect or rarely ascending, unbranched, glabrous at the nodes, eglandular; basal leaf sheaths glabrous, firmly chartaceous, terete, eglandular, persistent; ligule a line of hairs; leaf laminas 6–35(45) cm × 1–4(8) mm, linear, flat, folded or involute, glabrous to pilose, eglandular.
Panicle 4–19 cm long, very dense, cylindrical and spiciform, often interrupted below, the spikelets densely contracted about the primary branches, sessile or shortly pedicelled, the primary branches not in whorls, terminating in a fertile spikelet, glabrous in the axils, eglandular.
Caryopsis 0.5–0.8 mm long, broadly elliptic, somewhat laterally compressed.
