马斯箭竹 ma si jian zhu

Rhizome neck 5–7 cm, 1.6–3 cm in diam. Culms 3–4 m, 1–2 cm in diam.; internodes terete, 20–27 cm, rigid, initially densely white powdery and gray to white setose, waxy when old, longitudinal ribs prominent, solid or nearly so; nodes initially white powdery and sparsely setulose, supra-nodal ridge level or weakly prominent; sheath scar prominent, initially densely brown setulose. Branches 3–7 per node, initially setose. Culm sheaths persistent, narrowly rounded, longer than internodes, leathery, densely brown setulose, longitudinal ribs greatly prominent, margins initially gray ciliate, apex broadly triangular; auricles and oral setae absent; ligule truncate or convex, 1–2 mm, glabrous; blade readily deciduous, reflexed, linear-lanceolate, glabrous or adaxially slightly pilose at base. Leaves 2–6 per ultimate branch; sheath margins initially densely yellow-brown ciliolate; auricles absent; oral setae few, erect or curved, 2–4 mm; ligule truncate, ca. 1 mm, initially slightly pilose; blade linear-lanceolate, 4.5–12 × 0.4–0.9 cm, abaxially slightly puberulous, secondary veins 2- or 3-paired, transverse veins distinct, base broadly cuneate, margins spinescent-serrulate, apex acuminate. Inflorescence unknown. New shoots Jul.

* About 3200 m. W Yunnan.