Culms 3–6 m, 1.5–2 cm in diam.; internodes 20–25 cm, initially glabrous; wall ca. 3 mm thick, cavity with lamellate pith; nodes weakly prominent. Culm sheaths green, purple striate, sparsely purple spotted, initially shortly setose, margins ciliate; auricles oblong, small, ca. 4 mm; oral setae ca. 7 mm; ligule prominent, ca. 6 mm, ciliate, glaucous; blade reflexed, initially green, lanceolate. Leaves 2–5(–8) per ultimate branch; sheath initially pubescent, soon glabrous; auricles and oral setae developed but soon deciduous; ligule prominent, 5–8 mm, pubescent, erose; blade linear-lanceolate, 11–20(–30) × 1–2.3 (–3) cm, secondary veins 5–7-paired, margins obscurely serrulate. Raceme terminal or lateral. Spikelets 3–5, green, tinged purple, slightly compressed, 2.5–7 × 0.4–0.6 cm; florets 3–10; pedicel 2–13 mm, glabrous, terminal one longer. Rachilla ca. 7 mm, pubescent; glumes glabrous; lemma 1.4–1.9 cm, sparsely pubescent; palea 1.3–1.5 cm, pubescent; lodicules 5–6 mm, margin transparent. Anthers yellow. New shoots Apr, fl. Apr–May.
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