长舌酸竹 chang she suan zhu

Indocalamus nanunicus McClure, Lingnan Univ. Sci. Bull. 9: 25. 1940; Acidosasa xiushanensis T. P. Yi; Arundinaria bicorniculata W. T. Lin & Z. J. Feng; A. nanunica (McClure) C. D. Chu & C. S. Chao; A. projecta W. T. Lin; Metasasa albo-farinosa W. T. Lin; M. carinata W. T. Lin; Pseudosasa altiligulata T. H. Wen; P. nanunica (McClure) Z. P. Wang & G. H. Ye; P. nanunica var. angustifolia S. L. Chen & G. Y. Sheng; P. projecta (W. T. Lin) P. C. Keng.

Culms to 4 m, ca. 1 cm in diam.; internodes green-yellow, straight, terete, smooth, initially glaucous, black powdery when old; wall thick, pith spongy; nodes prominent, remains of sheath base persistent; intranode ca. 1 cm. Branches 1–3 per node at mid-culm, secondary branchlets undeveloped. Culm sheaths gradually deciduous, light purple-brown, densely white tomentose and brown setose, setae retrorse and adnate, base brown setose, margins ciliolate; auricles and oral setae absent; ligule truncate or arcuate, 7–9 mm; blade linear-lanceolate, scabrous, margins sparsely serrulate. Leaves 2–4 per ultimate branch; sheath striate, densely tomentose to subglabrous; auricles and oral setae absent; ligule acute, 5–15 mm, ciliolate; blade elliptic to lanceolate, 10–30 × 2–4.5 cm, abaxially pubescent, adaxially glabrous, secondary veins 9–12-paired, base oblique, both margins distally serrulate, apex shortly acuminate. Panicle 18–25 cm; bract lanceolate, ca. 2 mm. Pedicels 1–2.5 cm, slender, glabrous; spikelets 6–8, 3–7 × 3–5 cm; florets 7–9; rachilla 5–7 mm, densely pubescent, apex densely long ciliate. Glumes 2, abaxially shortly pubescent and keeled, margin proximally glabrous but distally ciliate, 5–9-veined; lemma 1.5–1.7 cm, abaxially shortly pubescent, margin proximally glabrous, 13–18-veined, apex acute; palea narrow, keels ciliate, apex acute or 2-lobed; lodicules lanceolate, prominently striate, margin not ciliate. Ovary shortly setose. Caryopsis oblong, with long beak, glabrous. New shoots late Apr.

* Flat lands, slopes of hills, valleys, streams; below 500 m. Chongqing, Guangdong, S Hunan, Jiangxi, Zhejiang.

Acidosasa xiushanensis was described from Chongqing (Xiushan), which lies to the northwest of what is otherwise the distribution of A. nanunica.