秃鞘箭竹 tu qiao jian zhu

Shrubby bamboo. Culms 0.8–1.2 cm in diam.; internodes light yellow, terete, 9.5–18.2 cm, white or black powdery below nodes, longitudinal ribs obscure; wall 2–3 mm thick, cavity filled with lamellate pith; supra-nodal ridges prominent; sheath scar weakly prominent. Branches 3–8(–15) per node, deflexed. Culm sheaths yellow, triangular to narrowly rounded, shorter than internodes, basally cartilaginous, distally leathery, glabrous, longitudinal ribs conspicuous on upper part; margins densely ciliolate, apex slightly white powdery; auricles absent; oral setae few; ligule truncate, ca. 1 mm, glabrous; blade erect, triangular-conical, glabrous. Leaves 2–4 per ultimate branch; sheath purple, glabrous or with white pubescent margins; auricles absent; oral setae few, erect, yellow-brown or gray, 2–4 mm, undulate; ligule truncate, ca. 1 mm, glabrous; blade narrowly lanceolate, 1.3–6.5 × 0.4–0.6 cm, glabrous or abaxially white-gray pubescent, secondary veins 2- or 3-paired, transverse veins distinct, base broadly cuneate, one margin spinescent-serrulate, other margin obscurely so. Inflorescence unknown.

* Yunnan.