Culms 8–10 m, 3–6 cm in diam., basally slightly flexuose, apically slightly drooping; internodes ca. 30 cm, initially stiffly dull brown hairy; wall thick; basal ca. 3 nodes with persistent ring of gray-white silky hairs above sheath scar; branching from 2nd to 5th node up. Branches solitary or 3 to several per node, dominant 3 longer and thicker; branchlets of those on lower nodes sometimes forming weak thorns. Culm sheaths deciduous, thickly leathery, ribbed-striate when dry, uniformly stiffly dull brown hairy or hairy only near base, apex subtruncate or slightly asymmetrical, broadly arched; auricles unequal, linear; larger auricle 1.5–2 × ca. 0.3 cm; smaller auricle ca. 1 × 0.2 cm; oral setae ca. 3 mm, undulate; ligule 3–4 mm, dentate, shortly fimbriate; blade erect, narrowly ovate to ovate-lanceolate, base slightly arched, narrowed, nearly 1/2 width of sheath apex, apex acuminate, sharply tipped. Leaf blade linear-lanceolate to lanceolate, 8–16 × 1.3–2.3 cm, both surfaces glabrous. Inflorescence unknown.
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