Culms to 10 m, 3–4 cm in diam.; internodes flexuose, 30–40 cm, not glaucous, initially setose; cavity pith spongy; nodes prominent; sheath ring glabrous. Culm sheath red-brown, densely setose in scattered clumps; auricles developed; oral setae radiate, curved, 7–9 mm; ligule slightly arched, 2–3 mm, shortly ciliolate; blade erect or horizontal, green, triangular-lanceolate or narrowly triangular, both surfaces sparsely setose, basal margins undulate, serrulate. Leaves 2–4 per ultimate branch; sheath glabrous; auricles small; oral setae sparse, deciduous, erect; blade lanceolate or oblong-lanceolate, 8–15 × 1–2.3 cm, secondary veins 4-or 5-paired, both surfaces glabrous, margins serrulate. Inflorescence unknown. New shoots Apr.
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