Rhizome neck more than 21 cm; internodes solid, less than 8 mm in diam. Culms 1–2 m, 3–8 mm in diam.; internodes terete, 8–15 cm, initially white powdery, densely so below nodes, glabrous, not ribbed; wall 1.5–2 mm thick; supra-nodal ridge level or prominent; sheath scar prominent, yellow-brown setose. Branches 1–7, erect or ascending. Culm sheath persistent, purple-brown, narrowly rounded-triangular, ca. 1/2 as long as internodes to equal in length, leathery, sparsely appressed brown setose, setae especially dense at base, margins glabrous or initially brown setulose, longitudinal ribs prominent; auricles absent; oral setae absent or present; ligule arcuate or truncate, 1–1.5 mm, glabrous; blade erect or rarely revolute, linear-lanceolate, glabrous. Leaves 2–7 per ultimate branch; sheath glabrous; auricles erect, narrowly rounded or small; oral setae 2–4, radiating, purple or yellow, 2–5 mm; ligule truncate, ca. 1 mm, glabrous; blade linear-lanceolate, 6–11.5 × 0.8–1.2 cm, glabrous, secondary veins 3–5-paired, transverse veins distinct, base cuneate, one margin densely serrulate, other sparsely so, apex long acuminate. Inflorescence unknown. New shoots May–Jul.
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