光叶箭竹 guang ye jian zhu

Borinda glabrifolia (T. P. Yi) Stapleton.

Rhizome neck 2.5–4.5 cm. Culms 4–6 m, 0.8–2 cm in diam.; internodes terete, 30–35 cm, initially densely white powdery, glabrous; wall 2–4 mm thick; supra-nodal ridges level; sheath scar weakly prominent. Branches many per node, subequal, initially white powdery. Culm sheaths gradually deciduous, triangularly narrowly rounded, leathery, sparsely gray-white to gray-yellow setose, longitudinal ribs prominent, margins glabrous; auricles absent or small; oral setae few, readily deciduous, erect; ligule truncate, 1–4 mm, initially pubescent, uniformly fissured; blade reflexed, linear-lanceolate to triangular-lanceolate, glabrous, margins serrulate and rolled. Leaves 2 or 3 per ultimate branch; sheath glabrous; auricles absent; oral setae yellow-brown; ligule truncate or convex, short, fimbriate, ciliate; blade narrowly lanceolate, 5–8 × 0.4–0.5 cm, glabrous, secondary veins 2-paired, transverse veins obscure, base broadly cuneate, margins obscurely spinescent-serrulate. Inflorescence unknown. New shoots late Jun.

* 3100–3500 m. S Xizang.