Abstract: This paper issued two new species of Yushania Keng f. from Western Slope of Gaoligongshan, Yunnan. Y.gigantea Yi et L. Yang is similar to Y.xizangensis Yi, but collar of this species is wide, 7~12 mm in diam., internode to 2.5 cm long; bigger culms, 6~7 m tall, internodes complanate or short longitudinal ditch on base a side of ramification, leaves (5) 6 (7) per ultimate, sheath (2.5) 3.2~4.8 cm long;,petiobles glabrous,blade biger, (3.5)10~18(20) cm×(0.45)8~1.3(1.8) cm. Y.pianmaensis Yi et L. Yang differs from Y.gigantea Yi et L. Yang by its shorter and smaller culms, 2.5~4 m high, 1~1.8（2.5） cm in diam.; more branches in per nodes, 12~30 per node, more slender, 1~1.5(2) mm diam. , culm sheaths glabrous, smaller blade, 1.5~3.5 cm long, 1~2.5 mm wide; A fewer leaves, (3)4~5 per ultimate branch, smaller blade, 12.5×0.8 cm.

Key words: Yushania Keng f., Y.gigantea Yi et L.Yang, Y.pianmaensis Yi et L.Yang, Yunnan