Culms 3–10 m, 2–8 cm in diam.; internodes 30–45 cm, initially glabrous, glaucous below nodes; wall 4–10 mm thick, cavity with spongy pith; nodes prominent, sheath base initially setose. Culm sheaths unspotted, leathery, setose, transverse veins obscure, base densely setose, apex truncate; auricles and cilia absent; ligule arched or triangular, 2–6 mm, ciliolate; blade lanceolate, base narrower than sheath apex. Leaves 4–7 per ultimate branch; sheath glabrous; auricles and cilia absent; ligule strongly prominent, 1.5–4 mm; blade lanceolate, 12–21 × 1.6–2.6 cm, secondary veins 5–7-paired, transverse veins distinct, serrulate. Raceme terminal or lateral. Spikelets 1–5, purple, 4–9 × 0.3–0.7 cm, compressed; rachilla ca. 5 mm, densely hairy; florets 3–15; pedicel 1–3 cm, apically pubescent. Glumes densely hairy; lemma 1.3–2.1 cm, densely setose. Palea short, 7–15 mm, narrow, ciliolate, apex rounded. Lodicules lanceolate, 2–3 mm, glabrous. Anthers yellow, 3–4 mm. Style 3–4 mm; stigmas 3-cleft, plumose. New shoots Apr, fl. May–Sep.
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A bamboo. It grows 3-10 m high. The culms are 2-8 cm across. The internodes are 30-45 cm long. The cavity has a spongy pith. There are 4-7 leaves on the ultimate branches. They are 12-21 cm long by 2-3 cm wide.
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