Taxonomic Revision on Series Buxifolii in Genus Cotoneaster (Rosaceae)

The Series Buxifolii Klotz of Sect. Alpigeni Hurusa wa 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. bre virameus 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 und ersurface and calyx, as well as the fruit always with 2 pyrenes, the Series Buxi folii Klotz emend. Zhou Wu of Sect. Alpigeni Hurusawa is a natural one.