Culms 5–8 m, 2.5–3.5 cm in diam., apically drooping; internodes 35–40 cm, initially sparsely white hispid; wall thin; basal 2 nodes usually with rings of gray-white silky hairs above sheath scar; branching from 3rd to 5th node up. Culm sheaths deciduous, glabrous, apically asymmetrically arched, one side slanted, other side arched; auricles obviously unequal, larger one slanted downward, lanceolate to oblong-lanceolate, ca. 1.5 × 0.5–0.7 cm, ca. 5 × size of smaller one, smaller one oblong with ends ascending; oral setae undulate; ligule ca. 1 mm, subentire; blade deciduous, erect, ovate-lanceolate, to 1/2 length of sheath, base slightly rounded and extending outward to join auricles for 2–3 mm, nearly 3/7 × as wide as sheath apex. Leaf blade linear-lanceolate, 11–16 × 1.5–2 cm, abaxially pubescent, adaxially glabrous. Inflorescence unknown.
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