海南箭竹 hai nan jian zhu

Rhizome neck 5–7 cm. Culms 3–7 m, 2–3.5 cm in diam.; internodes terete, 24–28 cm, glabrous; wall 2–3.5 mm thick; supra-nodal ridges level or weakly prominent; sheath scar weakly prominent. Branches 3–7 per node. Culm sheaths persistent, orange-red or gray, triangularly narrowly rounded, nearly as long as internodes, leathery, densely setose, margins apically brown ciliate; auricles absent; oral setae deciduous, erect, light yellow; ligule arcuate, 1–1.5 mm, margins initially densely light yellow ciliate; blade reflexed, linear-lanceolate, glabrous, margins serrulate. Leaves 3–5 per ultimate branch; sheath glabrous; auricles absent; oral setae present; ligule arcuate or truncate, ca. 1 mm; blade linear-lanceolate, 4–12 × 0.5–0.9 cm, pubescent basally, secondary veins 3- or 4-paired, transverse veins distinct, base cuneate, margins spinescent-serrulate. Inflorescence a raceme, terminal to leafy shoot; spikelets 4–7, 2.3–3 cm, rachilla 2.5–5 mm; florets 3–5, light green to dark purple. Glumes 2, papery, glabrous; lemma pilose, apex acuminate; palea keels ciliolate; lodicules densely ciliate. Anthers yellow. Ovary light yellow, ovoid, glabrous; style 1; stigmas 2. Caryopsis unknown. New shoots Aug.

* 1500–1800 m. Hainan (Wuzhi Shan).