Yushania doupengshanensis Y.Y. Zhang et N.H. Xia, 2021

Zhang, You-Yuan & Xia, Nian-He, 2021, Yushania doupengshanensis (Poaceae, Bambusoideae), a new bamboo species from south Guizhou, China, Phytotaxa 505 (2), pp. 229-234 : 230

Yushania doupengshanensis Y.Y. Zhang et N.H. Xia , sp. nov. (Figure 1 & 2)

Diagnosis. Yushania doupengshanensis is morphologically similar to Y. mabianensis T.P. Yi , Y. grammata T.P. Yi and Y. polytricha Hsueh et T.P. Yi , particularly in usually developing only one branch at mid-culm nodes, setose culm sheaths, conspicuous auricles and radiating oral setae of both culm leaves and foliage leaves (except for Y. grammata ), but can be easily distinguished in having densely white puberulous internodes, tardily deciduous culm sheaths, 6‒12 leaves per ultimate branch, as well as densely puberulous and 8‒9 mm long pseudopetioles.

Type. CHINA. Guizhou: Duyun County, Doupeng Mountain , 26°22’39”N, 107°21’25”E, 1200 m alt., 29 November 2020, Y. Y . Zhang 2004 (holotype: IBSC!) .

Description. Rhizomes pachymorph, rhizome neck 30–45 cm long, 0.4–0.5 cm in diameter, solid. Culms 0.8– 1.5 m tall, 0.4–0.5 cm in diameter; internodes terete, 14–18 cm long, green, densely white puberulous, thinly white powdery, densely below nodes; culm wall ca. 1 mm thick; nodes inconspicuous; sheath scar slightly prominent, with persistent remains of sheath base. Branching from third or fourth node (0.1–0.3 m) above the ground, branches usually 1, equal in size to culm, at ca. 30° angle. Buds ovate-elliptic, adnate to the internode surface, green, margins ciliolate. Culm leaves: sheaths tardily deciduous, oblong, leathery, 1/3 to 1/2 as long as internodes, densely setose, margins ciliate; auricles broadly falcate, 2.5‒3 × 1‒1.5 mm, deciduous, oral setae several, radiate, 5‒10 mm long; ligules ca. 2 mm tall, truncate, margins entire or shallowly serrate; blades reflexed, triangular lanceolate, ca. 3 cm long, involute, the base 1/3 to 1/2 as wide as the sheath apex. Foliage leaves 6–12 per ultimate branch; sheaths 4‒6 cm long, sparsely setose, margins glabrous; auricles narrowly falcate, ca. 1.5 × 1 mm, deciduous, oral setae several, radiate, 6–8 mm long, tardily deciduous; ligules truncate, ca. 1 mm tall; pseudopetioles densely puberulous, initially white powdery, ca. 8‒9 mm long; blades 15–24 × 2–3 cm, papery, shallowly wavy when dry, glabrous, glaucous abaxially, base cuneate, apex tapering, margins serrate, secondary veins 6–8 pairs, transverse veins inconspicuous. Inflorescence unknown.

Phenology. New shoots: September.

Distribution and habitat. This new species is only found in Doupeng Mountain, Duyun County, south Guizhou, China. It occurs along a stream and grows under the evergreen broadleaved forests at an altitude of 1150–1200 m, associated with species such as Chimonobambusa hirtinoda C.S. Chao et K.M. Lan , Chimonobambusa angustifolia C.D. Chu et C.S. Chao , Castanopsis spp. , Lithocarpus spp. and Cyclobalanopsis spp.

Etymology. The epithet refers to the type locality.

Vernacular name. Dǒu Péng Shân Yù Shân Zhú (Chinese pronunciation); ‡篷Ɯ玉Ɯü (Chinese name).