百山祖玉山竹 bai shan zu yu shan zhu

Rhizome neck ca. 25 cm; internodes solid. Culms 1.5–2 m, to 0.5 cm in diam.; internodes terete, ca. 19 cm, initially sparsely setose, thickly white powdery below nodes; wall 1.5–2 mm thick; nodes with weakly prominent supra-nodal ridge; sheath scar weakly prominent. Branches 3 to many. Culm sheaths gradually deciduous, 1/2–2/3 as long as internodes, abaxially or marginally sparsely white setose; auricles absent or obscure; oral setae absent or few, erect, purple; ligule convex or truncate, ca. 1 mm, ciliate; blade erect, linear or conical, glabrous. Leaves 3–5 per ultimate branch; sheath glabrous, initially white powdery; auricles absent or obscure; oral setae 5–8, erect, 0.5–1 mm; ligule truncate or convex, ca. 0.5 mm, glabrous; blade linear-lanceolate, 6–14 × 0.7–1.2 cm, glabrous or abaxially hairy at base, secondary veins 4-paired, transverse veins slightly obscure, one margin serrulate, other margin smooth. Inflorescence unknown. New shoots Apr–May.

* 1000–1100 m. S Zhejiang.