Yushania tomentosa (C.D.Chao & C.S.Chao) N.H.Xia, Y.H.Tong, J.B.Ni & X.Li, 2023

Li, Xing, Ni, Jing-Bo, Tan, Fei, Tong, Yi-Hua & Xia, Nian-He, 2023, Yushania tomentosa (Poaceae, Bambusoideae), a new combination from Guangxi, PhytoKeys 218, pp. 11-18 : 11

Yushania tomentosa (C.D.Chao & C.S.Chao) N.H.Xia, Y.H.Tong, J.B.Ni & X.Li comb. nov.

Figs 1 , 2 , 3

Sasa tomentosa C. D. Chu & C. S. Chao, J. Nanjing Technol. Coll. Forest Prod. 3(3): 35 (1981). Basionym.

Type.

China. Guangxi: Rongshui County, Jiuwan Mountain , elev. 1400 m, 25 August 1958, S. H. Chun 15320 (holotype: IBK, not seen; isotypes: NAS00070361, image!; WUK0211330, image!; N019023167, image!; IFP15899999w0005, image!) .

Description.

Shrubby bamboo. Rhizomes pachymorph, necks 20-30 cm long, 3-5 mm in diameter, solid. Culms 1-2 m tall, 2-6 mm in diameter, diffuse; branches intravaginal, developing from 4th to 5th nodes upwards, usually solitary at lower culm nodes, 1-2 at mid and upper culm nodes and rarely 3 at upper culm nodes; internodes terete, 15-27 cm long, glabrous, densely purple-spotted, thickly white powdery below nodes, nearly solid; nodes slightly prominent; supranodal ridges flat or slightly raised; intranodes 3-5 mm long, glabrous. Culm buds solitary, long-ovate to lanceolate, yellow to light green, ciliate on the margin, apex attenuate, base obtuse. Culm leaf sheaths persistent, 1/2-1/3 as long as internodes, densely white to yellowish-brown hirsute with trichomes 3-5 mm long, densely ciliate on the margin; sheath scar prominent, with persistent remains of sheath base; auricles falcate, 2-5 × 1-2 mm; oral setae developed, radiate, 8-12 mm long; ligule truncate, 0.5-1 mm high, ciliolate on the margin; blades linear-lanceolate to lanceolate, 1.2-3.5 × 0.2-0.7 cm, reflexed, ca. 1/2 as long as culm sheath, glabrous, margin serrulate. Foliage leaves 4-8 per ultimate branch; sheath densely white hirsute with trichomes ca. 2 mm long, margin ciliate, sometimes glabrescent, longitudinal ribs conspicuous; auricles falcate, 1-3 × 0.5-1.5 mm; oral setae radiate, 10-13 mm long; inner ligule ca. 1 mm high, truncate or oblique-truncate, ciliolate on the margin; outer ligule ca. 0.5 mm high, margin white ciliate with trichomes 0.5-1 mm long; pseudopetioles white puberulous, initially white powdery, 5-8 mm long; blades long-lanceolate to lanceolate, 13-22 × 1.5-2.6 cm, wavy when dry, glabrous, apex long-acuminate, base cuneate to obtuse, margin sparsely serrulate or sometimes entire; secondary veins 7-9 pairs, transverse veins conspicuous. Inflorescence unknown.

Phenology.

New shoots from August to September.

Vernacular name.

Róng Máo Yù Shān Zhú (Chinese pronunciation); 绒毛玉山竹 (Chinese name).

Additional specimens examined.

Yushania tomentosa : China. Guangxi: Rongshui County, Wangdong Township, Jiuwan Mountain , Weilinjiang , 23 September 2022, 25°18'39.3"N, 108°38'13.2"E, elev. 1358 m, X. Li & J. B. Ni LX168 (IBSC). Yushania doupengshanensis : China. Guizhou: Duyun County, Doupeng Mountain , 29 November 2020, 26°22'39"N, 107°21'25"E, elev. 1200 m, Y. Y. Zhang 2004 (holotype: IBSC0865924!; isotypes: IBSC0865925!, IBSC0865926!) .

Figures

Figure 1. Isotypes of Sasa tomentosa (S. H. Chun 15320, A NAS 00070361 B WUK 0211330). Photo A by Wei Zhou, B by Liang Zhao.

Figure 2. Specimen of Yushania tomentosa, X. Li & J. B. Ni LX 168 (IBSC).

Figure 3. Yushania tomentosa A habit B culm leaf and partial culm C foliage leaf branch D part of foliage leafy branch, showing tomentose sheath and radiate oral setae E culm bud F pachymorph rhizome with long neck G three branches at an upper culm node. All photos by Xing Li.