Rhizome neck 7–60 cm; internodes solid. Culms 2–7 m, 1–3 cm in diam.; internodes terete, 30–35 cm, nearly solid, initially densely white powdery and sparsely brown setose below nodes, longitudinal ribs prominent; nodes with level supra-nodal ridge; sheath scar prominent. Branches 5–15, subequal, nearly solid. Culm sheaths persistent, shorter than internode, leathery, rigid, sparsely gray-yellow or brown setose, margins initially yellow-brown setulose, apex narrowly rounded; auricles absent; oral setae 8–15; ligule truncate or arcuate, 1–1.5 mm, glabrous; blade deciduous, linear-lanceolate, slightly hairy, margins serrulate, revolute. Leaves 2–5 per ultimate branch; sheath apically white powdery, glabrous or densely yellow setose, margins initially ciliate; auricles absent; oral setae present; ligule truncate or convex, ca. 1 mm, glabrous; blade lanceolate, 5–16 × 0.7–1.2 cm, glabrous, secondary veins 3–5-paired, transverse veins obscure, base cuneate, margins spinescent-serrulate. Inflorescence paniculate. Spikelets purple-green or purple, 1.6–4 cm, slender; rachilla 2–5 mm, apically pubescent and swollen, margins ciliate; florets 4–14, terminal one sterile. Lemma abaxially pale hairy, hairs deciduous, to 8–11 mm, apex acuminate; palea apically bifid, 2-keeled, keels ciliate; lodicules 3, margins apically ciliate. Anthers yellow. Ovary ovoid, yellow-brown; style 1; stigmas 3, plumose. Caryopsis oblong, ventrally grooved, with persistent style. New shoots Jun.
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