Rhizome neck 20–50 cm. Culms 0.6–1.6 m, 3–5 mm in diam.; internodes initially purple spotted, terete, 8–15 cm, white powdery below nodes, glabrous, nearly solid; supra-nodal ridges level or weakly prominent; sheath scar prominent, glabrous. Branches 1 per node. Culm sheaths persistent, triangularly narrowly rounded, 1/2–2/3 as long as internodes, cartilaginous, glabrous, margins densely brown ciliate; auricles and oral setae absent; ligule truncate or convex, ca. 0.5 mm; blade reflexed or erect, narrowly lanceolate or conical, glabrous. Leaves 6–11 per ultimate branch; sheath glabrous, margins sometimes gray ciliate; auricles and oral setae absent; ligule truncate or convex, ca. 0.5 mm, glabrous; blade narrowly lanceolate, 11–22 × 1.5–2.6 cm, glabrous, secondary veins 5–7-paired, transverse veins distinct, base cuneate, margins serrulate. Inflorescence unknown. New shoots Jul.
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