空心竹 kong xin zhu

Culms to 6 m, ca. 2 cm in diam.; internodes green, terete, 30–40 cm, not grooved, glabrous; nodes not raised. Branches 1–3 per node. Culm sheaths nearly persistent, green, setose, densely setose at base, margins brown ciliate; auricles brown, elliptic; oral setae slender; ligule truncate, 1–2 mm; blade erect, green, lanceolate, both surfaces glabrous, base constricted, margin serrulate, apex slightly rugose. Leaves 3–5 per ultimate branch; sheath glabrous, margin ciliolate; auricles obscure; oral setae erect, to 1.3 cm; ligule truncate, short; blade lanceolate, 11–20 × 1–2.2 cm, both surfaces glabrous, secondary veins 6- or 7-paired, base broadly cuneate, apex long acuminate. Inflorescence terminal to lateral branches; spikelets 1–5, pedicel 5–7 mm, terminal one to 1.4 cm, glabrous; florets ca. 11. Glumes 1 or 2; lemma margins ciliolate apically, mucronate; palea slightly shorter than lemma, densely hairy, apex rounded; lodicules ciliolate. Ovary columnar. New shoots Jun.

* Zhejiang.

This species is possibly a synonym of Pleioblastus rugatus.