Abstract: The mid-montane humid evergreen broad-leaved forest is the most typical vegetation type of the subtropical-montane vegetation type in Yongde Snow Mountain (YSM). It is also the vegetation type occupied the largest area, most integrated and valuable of YSM. Analysis of the disposition in vertical structure of 219 dominant and frequent species in the forest, it can be shown that only Tropical Asian, Sino-Himalayan and China-endemic elements occurred in all synusiae including the A、B、C tree layers, the shrub layer, and the herb layer. Among 219 dominant and frequent species, the Sino-Himalayan and China-endemic elements take a large portion, and the Tropical Asian elements play an important role as well, It is suggested that YSM is floristically intervenient between subtropical and temperate elements. Further analysis of China-endemic species shows that YSM is floristically transitional. All evidence indicats that YSM is on the border between Sino-Himalayan floristic subkingdom and Malesian floristic subkingdom, and its transitional floristic characteristics are rather distinct. Comparison of dominant and main companion species between Yongde Snow Mountain and those of its neighbouring regions shows that the forestry environment of Yongde Snow Mountain is humider and warmer than that of other regions.

Key words: Yongde SnowMountain