伏牛山箭竹 fu niu shan jian zhu

Rhizome neck (2.3–)6–12 cm, (0.5–)0.8–1.4 cm in diam. Culms 1.2–2(–2.5) m, (0.3–)0.5–0.8(–1.2) cm in diam.; internodes terete, 8–12 cm, initially sparsely white powdery, glabrous; wall 1.5–2(–3) mm thick; supra-nodal ridges weakly prominent; sheath scar prominent. Branches 2–5 per node. Culm sheaths persistent, triangular-elliptic, usually shorter than internode, leathery, glabrous, longitudinal ribs prominent, margins glabrous; auricles and oral setae usually absent; ligule arcuate, 5–7 mm; blade erect, linear-triangular or linear. Leaves 2–4(or 5) per ultimate branch; sheath purple, margin densely gray-brown ciliate distally; auricles absent; oral setae absent or obscure; ligule truncate or arcuate, 0.5–1 mm, margin initially white ciliolate; blade lanceolate, (4–)5–8 × (0.6–)0.9–1.2 cm, glabrous, secondary veins 3- or 4-paired, transverse veins distinct, base cuneate, margin serrulate. Inflorescence unknown.

* 1400–2100 m. Henan (Laojun Shan, Luanchuan).