Culms 9–12 m, 5–10 cm in diam.; internodes initially green, yellow-green in age, 50–77 cm, glaucous, glabrous, minutely papillate; nodes prominent, glaucous. Culm sheaths golden-yellow or pale red-brown, triangular, 2–4 cm wide, glaucous, purple-brown setose, basally subglabrous, apex narrow; auricles ovate to elliptic, ca. 11 × 7–8 mm, rugose, abaxially roughly hairy; oral setae erect, 5–10 mm; ligule prominent, 3–5 m, roughly hairy, with cilia 2–3 mm; blade striate, lanceolate to triangular, margins retrorsely setose, both surfaces glabrous. Leaves 3 or 4 per ultimate branch; sheath glabrous; auricles and oral setae absent; ligule ca. 2 mm; blade lanceolate, 8–13 × 1.4–2 cm, mainly glabrous, abaxially proximally pubescent, secondary veins 5-or 6-paired, serrulate. Flowering branchlets lateral, 8–9 cm. Pseudospikelets 2 or 3, 5–6 cm; florets 7–9. Glumes 1 or 2; lemma glabrous; palea nearly as long as lemma, keels and apex ciliate; lodicules 3–4 mm. Ovary 0.5–1 mm; styles ca. 2.5 mm; stigmas 3.
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