西藏箭竹 xi zang jian zhu

Arundinaria macclureana Bor, Kew Bull. [12] 1957: 420. 1958; Borinda macclureana (Bor) Stapleton; B. setosa (T. P. Yi) Stapleton; Fargesia setosa T. P. Yi; Sinarundinaria macclureana (Bor) C. S. Chao & G. Y. Yang.

Rhizome neck 3–5 cm, 4–20 mm in diam. Culms 1–7 m, 0.5–3.5 cm in diam.; internodes terete, 18–28(–53) cm, initially sparsely white powdery, initially densely brown or gray-brown setose below each node, longitudinal ribs prominent; wall 2–8 mm thick; supra-nodal ridge weakly prominent; sheath scar prominent, initially brown setose. Branches 3–7 per node, deflexed, subequal. Culm sheaths persistent or gradually deciduous, narrowly triangular, slightly longer than internodes, leathery, densely brown-yellow to brown setose, longitudinal ribs prominent, margins brown ciliolate or not; auricles absent; oral setae few, deciduous, erect, purple, 3–12 mm, undulate; ligule truncate or convex, 1–1.5 mm, margins usually serrulate, ciliolate; blade readily deciduous, reflexed, triangular-linear or linear-lanceolate, adaxially slightly pilose, one margin dentate-serrulate. Leaves 3–5 per ultimate branch; sheath purple-green, puberulous; auricles obscure or absent, purple; oral setae few, deciduous, curved, purple or yellow-brown, 1.5–3 mm; ligule arcuate or truncate, 0.5–1.5 mm; blade lanceolate, 4–17 × 0.4–1.8 cm, abaxially slightly puberulous, secondary veins 3- or 4-paired, transverse veins weakly prominent, base broadly cuneate, margins spinescent-serrulate. Inflorescences terminal on leafy branchlets, open panicles, 9–12 cm. Spikelets 2–3 cm, tinged with purple; glumes 2, florets 5–7 plus a terminal sterile floret; lemmas ca. 1.6 cm, awned, awns ca. 2 mm; palea ca. 11 mm; lodicules 3, ciliate, 2 lateral ones larger; stamens 3, anthers yellow; style 1, stigmas 2. Caryopses unknown. New shoots Jul.

* Dominant bamboo in understory of Picea or Pinus densata and Quercus forests; 2100–3800 m. SE Xizang.

This is the type species of the genus Borinda.