Culms (0.5–)1–3.5 m, 0.6–1.2 cm in diam.; internodes initially green, yellow when old, purple spotted, cylindrical, 13–18(–24) cm, initially slightly glaucous, glabrous; wall 3–4 mm thick, pith initially lamellate, later coarsely powdery; nodes flat; intranode 1.5–3 mm; sheath scar slightly prominent, glabrous. Culm sheaths persistent, yellow, glabrous or adnately setose; auricles absent; oral setae rarely present, 4–6 mm; ligule purple, arcuate, ca. 1 mm, glabrous; blade initially gray-green or purplish, smooth or sometimes rugose, glabrous, margin entire. Leaves 2–4 per ultimate branch; sheath green-purple, glabrous, margins smooth; auricles absent; oral setae 1 or 2, 2–5 mm; ligule purple, truncate, ca. 0.5 mm, glabrous; pseudopetiole purple, 0.8–1.5 mm, glabrous; blade linear-lanceolate, (2.2–) 3.3–6.7 × 0.4–0.8 cm, glabrous, secondary veins 2-or 3-paired, base broadly cuneate, one margin serrulate, other margin remotely serrulate or nearly entire, apex acuminate. Inflorescence racemose; rachilla internodes 3.5–5 mm, setose; pedicel 2–6(–11) mm, slender; florets 4–6, purple. Glumes 2, glabrous; lemma ovate-lanceolate, glabrous or setose, long mucronate; palea 2-cleft; lodicules rhombic-lanceolate, margins ciliolate. Anthers purple. Ovary light yellow, ellipsoid, glabrous; style 1; stigmas 3. Fruit unknown. New shoots and fl. May.
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