Abstract: The Series Buxifolii Klotz of Sect. Alpigeni Hurusawa in Cotoneaster Medicus has been redefinited in this paper. It contains 4 species, namely C. buxifolius Wall. ex Lindl., C. delavayanus Klotz, C. insolitus Klotz and C. poluninii Klotz. C. argenteus Klotz, C. brevirameus Rehd. & Wils., C. hodjingensis Klotz, C. lijiangensis Klotz, C. rockii Klotz and C. marginatus Lindl. ex Schlecht, which is put into the Ser. Marginati Klotz, as well as C. rubens var. miniatus Yu are all reduced to the C. buxifolius Wall. ex Lindl. C. buxifolius f. vallea Franch. and C. astropores J. Fryer et E. C. Nelson are indentical with C. poluninii Klotz. Based on generally erect habit, densely tomentose leaf undersurface and calyx, as well as the fruit always with 2 pyrenes, the Series Buxifolii Klotz emend. Zhou & Wu of Sect. Alpigeni Hurusawa is a natural one.

Key words: Series Buxifolii Klotz