Rhizome neck 25–45 cm. Culms 1–2.5 m, 3–8 mm in diam.; internodes terete, 15–22 cm, initially with white powdery ring below nodes, glabrous, nearly solid; supra-nodal ridges level or weakly prominent; sheath scar weakly prominent. Branches 1 per node. Culm sheaths persistent, triangularly narrowly rounded, 1/4–1/3 as long as internodes, cartilaginous, glabrous, margins densely yellow-brown setulose; auricles purple, falcate; oral setae 3–5, purple or yellow, 5–8 mm; ligule truncate, glabrous; blade reflexed, linear-lanceolate, glabrous. Leaves 5–13 per ultimate branch; sheath apically white powdery, margins densely yellow-brown ciliate; auricles purple, elliptic; oral setae 7–12, purple or yellow, 5–12 mm; ligule truncate, glabrous; blade lanceolate, (13–)19–26(–33) × 1.2–4 cm, glabrous, secondary veins 7–9-paired, transverse veins distinct, base cuneate, margins serrulate and obscure or one margin prominent, other margin obscurely so. Inflorescence unknown. New shoots Jul.
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