Rhizome neck 2.5–5 cm, 6–10 mm in diam. Culms 2–4 m, 0.5–1.2 cm in diam.; internodes terete, 18–24 cm, initially slightly white powdery, glabrous; wall 1.5–3.5 mm thick, pith granular; supra-nodal ridges weakly prominent; sheath scar prominent. Branches (1–)3(–5) per node, deflexed. Culm sheaths persistent, narrowly rounded or triangularly narrowly rounded, ca. 1/2 as long as internodes, leathery, glabrous, longitudinal ribs prominent, margins densely gray ciliolate; auricles and oral setae absent; ligule arcuate, ca. 1 mm, glabrous; blade not readily deciduous, erect, triangular or triangular-lanceolate, glabrous, not articulate with sheath. Leaves 2 or 3(or 4) per ultimate branch; sheath glabrous; auricles and oral setae absent or obscure; ligule inclined-truncate, ca. 0.7 mm, glabrous; blade irregular, narrowly ovate-lanceolate, 6.5–9 × 1.2–1.8 cm, secondary veins 4-paired, transverse veins obscure, base rounded, margins spinescent-serrulate. Inflorescence unknown. New shoots Jul.
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