Culms to 12 m, to 6 cm in diam.; internodes initially green, flattened above branches, 25–40 cm, initially glabrous, smooth, white powdery or tuberculate below nodes; nodes glabrous, swollen, ca. 8 mm. Culm sheaths initially abaxially green, margin purple or light brown to brown, subtriangular, brown setose, base densely pubescent, margin ciliate, apex narrow; auricles narrowly falcate, expanded, ca. 1.2 cm; ligule short, margin ciliate; blade reflexed, purple, lanceolate to oblong-lanceolate, scabrid. Leaves 4 or 5 per ultimate branch; sheaths green, 5–5.5 cm, glabrous, striolate, margin ciliate; auricles and oral setae absent; ligule ovate, glabrous; blade lanceolate or oblong-lanceolate, 11–18 × 1.7–2.8 cm, proximally pubescent, distally glabrous, lateral veins 6 or 7, tessellate. Spikelets 2–4, 7–11 cm; pedicels 3–12 mm; florets 7–14; rachilla 4–5 mm. Glumes 2, 7–8 mm, 5–7-veined; lemma ca. 1.7 × 0.9 cm, 13-veined, tessellate; palea narrow, 4-veined between keels; lodicules apically ciliate. Stamens (5 or)6. Ovary oblong; stigmas flagellate.
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A bamboo. It grows 12 m high. The stems are 6 cm across. The stems are flattened above the branches. There are 4 or 5 leaves on the ultimate branches. They are oblong and 11-18 cm long by 2-3 cm wide. They are hairy near the stem.
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