Culms erect, to 4 m tall, 1–1.5 cm in diam.; internodes terete, 20–25(–30) cm, initially distally adnately brown setose, later verrucose; wall quite thin; supra-nodal ridges prominent, basal nodes with rings of root thorns; sheath scars with a densely brown tomentose ring; buds densely brown hairy. Branches 3 per node. Culm sheaths late deciduous, 1/2–2/3 as long as internode, papery, adnately brown setose, densely so at base, veins distinct, veinlets indistinct, margins fulvous ciliate; ligule ca. 1 mm; blade deciduous, triangular-subulate, 5–7 mm, articulate. Leaves 6–8 per ultimate branch; sheath 5–8 cm, margins white ciliate; oral setae erect, ca. 1.5 cm, stiff; ligule ca. 2 mm; leaf blade oblong-lanceolate, 30–35 × ca. 2.5 cm, secondary veins 7- or 8-paired. Inflorescence unknown. New shoots Jul–Aug.

* Yunnan.