Plant robust, from a rhizomatous rootstock. Culms stout, canelike, 3–7 m tall, 10–20 mm in diam. in lower part, branching, branches ascending, branch buds invested with pubescent or pilose scales, internodes mostly hollow, becoming solid toward apex, nodes glabrous in lower part of culm, pubescent in upper part, lower nodes often bearing adventitious roots. Leaves cauline, glabrous; leaf blades linear, flat, 50–90 × 1.5–3 cm, midrib prominent, adaxial surface pilose at base behind ligule, margins scabrid, base rounded or tapering to a pseudopetiole, apex finely acuminate; ligule ca. 0.5 mm, margin pilose, auricles ca. 1 mm or absent. Panicle large, 20–40 × 10–15 cm; axis glabrous, 10–25 cm. Racemes 20–40, 10–30 cm, rachis puberulous at base, otherwise glabrous; lower pedicel 1.5–2 mm, upper pedicel 4.5–5.5 mm. Spikelets 4–6.5 mm, pilose, awnless; callus hairs ca. 10 mm, exceeding the spikelet; glumes subequal, membranous, apex attenuate; lower glume 3–5-veined, back pilose with ca. 10 mm hairs; upper glume 3-veined, back glabrous, margins pubescent; lower lemma lanceolate, hyaline, 3.5–4.5 mm, veinless, pilose; upper lemma similar to lower, 3–4 mm; upper palea hyaline, pilose, reduced to a small scale. Anthers 3, ca. 2 mm. Caryopsis lanceolate, ca. 2 mm.
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