Culms to 4 m, ca. 1 cm in diam.; internodes green-yellow, straight, terete, smooth, initially glaucous, black powdery when old; wall thick, pith spongy; nodes prominent, remains of sheath base persistent; intranode ca. 1 cm. Branches 1–3 per node at mid-culm, secondary branchlets undeveloped. Culm sheaths gradually deciduous, light purple-brown, densely white tomentose and brown setose, setae retrorse and adnate, base brown setose, margins ciliolate; auricles and oral setae absent; ligule truncate or arcuate, 7–9 mm; blade linear-lanceolate, scabrous, margins sparsely serrulate. Leaves 2–4 per ultimate branch; sheath striate, densely tomentose to subglabrous; auricles and oral setae absent; ligule acute, 5–15 mm, ciliolate; blade elliptic to lanceolate, 10–30 × 2–4.5 cm, abaxially pubescent, adaxially glabrous, secondary veins 9–12-paired, base oblique, both margins distally serrulate, apex shortly acuminate. Panicle 18–25 cm; bract lanceolate, ca. 2 mm. Pedicels 1–2.5 cm, slender, glabrous; spikelets 6–8, 3–7 × 3–5 cm; florets 7–9; rachilla 5–7 mm, densely pubescent, apex densely long ciliate. Glumes 2, abaxially shortly pubescent and keeled, margin proximally glabrous but distally ciliate, 5–9-veined; lemma 1.5–1.7 cm, abaxially shortly pubescent, margin proximally glabrous, 13–18-veined, apex acute; palea narrow, keels ciliate, apex acute or 2-lobed; lodicules lanceolate, prominently striate, margin not ciliate. Ovary shortly setose. Caryopsis oblong, with long beak, glabrous. New shoots late Apr.
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