Fargesia viridis D.Z. Li & X.Y. Ye, 2020

Ye, Xia-Ying, Zhang, Yu-Xiao & Li, De-Zhu, 2020, Two new species of Fargesia (Poaceae, Bambusoideae) from southwestern China, PhytoKeys 170, pp. 25-37 : 25

Fargesia viridis D.Z. Li & X.Y. Ye sp. nov. Figs 1 , 2

Diagnosis.

Fargesia viridis D.Z. Li & X.Y. Ye resembles F. frigidis Yi, F. zayuensis Yi and F. similaris Hsueh & Yi, but can be distinguished from F. frigidis by thinner and glabrous culm, more leaves on the ultimate branch, longer leaf sheath and large leaf blade, from F. zayuensis by shorter and thinner culm, solid internode, more leaves on the ultimate branch and broader leaf blade, and from F. similaris by solid internode, prominent sheath scar, setose culm sheath, glabrous petiole, more leaf number and larger leaf blade.

Type.

China, Yunnan, Gongshan County, along the road to Dulongjiang Town, 27°51'28"N, 98°26'46"E, 2667 m alt., 1 September 2015, X.Y.Ye YXY272 (holotype & isotype: KUN!).

Description.

Rhizomes pachymorph, rhizome neck 3-6 cm long, 1-1.6 cm in diameter, solid. Culms 2-3 (4) m tall, pluricaespitose, 0.6-1.2 cm in diameter; internodes terete, 16-22 (30) cm long, densely white powdery and black when culms old, glabrous, nearly solid; nodes with weakly prominent supra-nodal ridge; sheath scar prominent, initially brown setose, with persistent remains of sheath base. Branches 8-10, fascicular, open; buds oblong, margins yellow-brown ciliolate. Culm sheaths persistent or tardily deciduous, leathery, narrowly rounded, 1/3 as long as internodes, yellow setose, densely at base and readily deciduous, longitudinal ribs prominent, margins yellow ciliolate, apex asymmetrical; auricles absent; oral setae absent or 1-2, ca. 2 mm long; ligule concave or truncate, ca. 1 mm tall, glabrous, fissured; blades erect or reflexed, linear-lanceolate, glabrous, narrower than the apex of culm sheath. Foliage leaves 4-6 per ultimate branch; sheath 3-4 cm long, glabrous, purple, margins ciliolate; auricles and oral setae absent; ligule truncate, ca. 1 mm tall; petiole 1-3 mm long, glabrous; blade lanceolate, 4-9 × 0.7-1.4 cm, glabrous, base broadly cuneate, secondary veins 2-3 pairs, transverse veins conspicuous, margins serrate. Inflorescence unknown.

Phenology.

New shoots July to August.

Etymology.

The specific epithet refers to the beautiful color of leaf blade.

Vernacular name.

Cuì Lǜ Jiàn Zhú (Chinese pronunciation); 翠绿箭竹 (Chinese name).

Distribution and habitat.

Fargesia viridis is only known from the type locality, the Dulongjiang Town. It occurs along the stream and grows as pure bamboo forest or under the evergreen broadleaved forest at an elevation of 2600-2800 m alt.

Notes.

Morphological comparisons between Fargesia viridis and the related species were provided in Table 1 . Other four species of this genus were found in the Dulongjiang Town, i.e., F. declivis Yi, F. sagittatinea Yi, F. acuticontracta Yi and F. praecipua Yi, with this new species being easily distinguished from the other species in this region by its shorter and thinner culms, solid internodes (except F. acuticontracta ), and shorter culm sheath (only 1/3 as long as internode).

Figures

Figure 1. Fargesia viridis D. Z. Li & X. Y. Ye A habitat B individual C rhizome D culm showing solid and nearly solid internodes E culm bud and sheath scar with yellow setose F young culms with culm sheaths G culm sheath showing densely setose at base and oral characters H branchlet.

Figure 2. Fargesia viridis D. Z. Li & X. Y. Ye A branchlet B rhizome C node, showing branches and sheath scar with setose D yong culm with culm sheathes E, F culm leaves showing sheath and densely setose at base G culm buds.