Oligostachyum spongiosum (C. D. Chu & C. S. Chao) Q. F. Zheng & Y. M. Lin

Culms to 10 m tall, 2–5 cm in diam.; internodes initially green, striate, 25–40 cm, papillate below nodes; wall thick; nodes swollen; sheath ring corky, prominent, initially glabrous or setose. Culm sheath yellow-green or brown-yellow, basally subtriangular, leathery, densely setose and papillose at base, margins shortly setose, purplish, apex narrowly constricted, ca. 2 cm wide; auricles elliptic or falcate, 5–9 mm, both surfaces coarsely brown hairy; oral setae 8–15 mm; ligule purple, arched or nearly truncate, 2–3 mm, nearly entire, ciliate; blade deciduous, erect or reflexed, purple-green, striate, lanceolate, 8–11 × ca. 1 cm, scabrid. Leaves 2 or 3 per ultimate branch; sheath glabrous; auricles usually absent, sometimes falcate; oral setae ca. 7 mm, curved; ligule truncate or slightly prominent, 0.5–1 mm, glabrous; blade with 5 pairs of secondary veins, one margin serrulate, other margin entire. Inflorescence unknown. New shoots Apr–May.

* Guizhou.

Arundinaria dushanensis C. D. Chu & J. Q. Zhang, Bamboo Res. 1982(1): 1. 1982.