Culms ca. 1 m, 2–3 mm in diam.; internodes pale green or tinged with purple, triangular, 7–15 cm, glabrous, grooved above branches; nodal ridge rather raised. Culm sheaths deciduous, unmarked, papery, glabrous or basally setulose, margins ciliate; auricles and oral setae absent; ligule to 4 mm, blade small, subulate or acicular in lower sheaths. Branches 3–5 per node, 3–5-noded, with a lateral bud, each branch with a gradually deciduous prophyll and some branch sheaths, prophyll 3–5 cm, membranous, margins ciliate. Leaves 1(or 2) per ultimate branch; sheath glabrous; auricles and oral setae absent; ligule lanceolate or triangular, 4–6 mm or more, conically tightly involute, or loose in lower leaf of 2-leaved branch, membranous, puberulent; blade ovate-lanceolate, 6–10 × 1–2.5 cm, both surfaces glabrous, secondary veins 5–8(or 9)-paired, tessellations distinct, base asymmetric, margins minutely serrulate, apex acuminate. New shoots May–Jun.
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