Rhizome neck 13–70 cm, 6–11 mm in diam. Culms 2–3 (–4) m, 1.2–1.6(–2) cm in diam.; basal internodes 5–10 cm, upper internodes purple spotted, terete, 18–22(–32) cm, initially white powdery below nodes, glabrous; wall 2.5–5 mm thick; supra-nodal ridges level or prominent; sheath scars prominent, initially purple, gradually brown, glabrous; intranode 4–9 mm. Branches 1 per node, nearly as thick as culm. Culm sheaths persistent, 1/3–1/2 as long as internodes, cartilaginous, glabrous, margins initially purple ciliate; auricles falcate; oral setae many, ca. 1.2 cm; ligule purple, truncate, 1–2.5 mm, glabrous; blade erect, narrowly triangular or linear-lanceolate, 8–25 × 3–6 mm, glabrous. Leaves 3 or 4(–6) per ultimate branch; sheath (4–)6–10 cm, glabrous; auricles purple, falcate; oral setae many, ca. 1 cm; ligule truncate, 1–1.5 mm, glabrous; blade lanceolate, (4.5–)12–18 × (1.2–)2–3.7 cm, glabrous, secondary veins (4 or)5–7(or 8)-paired, transverse veins distinct, base cuneate, margins serrulate. Inflorescence unknown. New shoots Jun–Jul.
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