Culms 2.5–4(–6) m tall, 1.5–2 cm in diam.; internodes terete or obscurely 4-anged, 18–22 cm, grooved and ridged above branches, glabrate; basal nodes with rings of root thorns. Branches 3 per node. Culm sheaths deciduous, shorter than internodes, thickly papery, glabrous, main veins purple, transverse veins distally prominent, margins ciliate; ligule 0.5–1 mm; blade subulate-triangular, 3–5 mm, articulate. Leaves 1–3 per ultimate branch; sheaths leathery, glabrous, margins ciliate; oral setae pale, 3–5 mm; ligule 1–1.5 mm; leaf blade oblong-lanceolate, 18–20 × 1.2–1.5 cm, secondary veins 4–6-paired. Pseudospikelets without bracts or with 1–4 bracts, upper 1 or 2 with buds or secondary spikelets; florets 3 or 4. Glumes 2 or 3; lemma ovate-lanceolate, 7–9-veined, apex gradually acuminate. Palea narrowly ovate, subequal to lemma. Anthers yellow. Ovary ovoid; style short, divided nearly from base. Caryopsis nutlike, ovoid-ellipsoid, ca. 16 × 6 mm.
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A bamboo. It grows 3-4 m tall. The stems are 2 cm across. The internodes are 18-22 cm long. They are grooved and ridged above the branches. The nodes near the base have a ring of root thorns. There are 3 branches per node. There are 1-3 leaves on the last branch. The leaf blade is 18-20 cm long by 1-2 cm wide.
It is a temperate plant. It grows in mountain areas between 1,000-2,400 m above sea level in Sichuan in China.
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Mountain areas; at elevations from 1,000-2,400 metres.
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