Rhizome neck to 46 cm, 2.5–4.5 mm in diam. Culms 1–1.8 m, 3–5 mm in diam.; internodes initially purple spotted, terete, 18–25 cm, with white powdery ring below each node, glabrous, nearly solid; supra-nodal ridge level or weakly prominent; sheath scar prominent, glabrous. Branches 1 at lower nodes to 3 at upper nodes. Culm sheaths persistent, triangularly narrowly rounded, ca. 1/3 as long as internodes, leathery, sparsely adnately gray setose, becoming glabrous, margins densely yellow-brown setose; auricles absent or small; oral setae radiating; ligule truncate or convex, ca. 0.5 mm, glabrous; blade reflexed, linear-lanceolate, glabrous. Leaves 2–12 per ultimate branch; sheath margins glabrous; auricles absent; oral setae absent or present; ligule truncate or arcuate, glabrous; blade lanceolate, 13–23 × 1.5–2.7 cm, glabrous, secondary veins 5-or 6-paired, transverse veins distinct, base cuneate, margins serrulate. Inflorescence unknown. New shoots May.
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