尖尾箭竹 jian wei jian zhu

Arundinaria cuspidata Keng, Sinensia 7(3): 410. 1936; Sinarundinaria cuspidata (Keng) P. C. Keng; Thamnocalamus cuspidatus (Keng) P. C. Keng.

Culms ca. 5 m, ca. 2 cm in diam.; internodes terete, 14–19 cm, initially white powdery. Branches many, to 60 cm, glabrous. Culm sheaths unknown. Leaf sheath 3–6 cm, glabrous; auricles absent; oral setae deciduous; ca. 3 mm; ligule truncate, ca. 1 mm, rigid; blade narrowly rectangular, 3.5–12 × 0.5–1 cm, glabrous or slightly pilose basally, secondary veins 3–5-paired, transverse veins present, base broadly cuneate, margins scabrous or nearly smooth, apex long acuminate. Inflorescence a raceme or contracted panicle, exserted from spathe; spikelets many, 2.5–3 cm, rachilla internodes 4–6 mm, slightly pilose apically; florets 3 or 4, light yellow. Glumes 2, sparsely hairy, apex obtuse; lemma hairy, apex obtuse; palea keels ciliate; lodicules ciliate, obtuse at apex. Ovary ca. 2 mm; styles 3; stigma unknown. Caryopsis red-brown.

* About 1600 m. N Guangxi.