Floral Analysis of Seed Plants in Sehgyla Mountains, Tibet

There are 1391 species of seed plants in Shergyla mountains, belonging to 491 genera and 103 families, including 3 families, 9 genera and 16 species of gymnosperms, 100 families, 482 genera and 1375 species of angiosperms. Temperate distribution is the dominant element, 324 genera, which accounting for 73.4 % of the total number of genera. Among the floristic element of species, the number of species endemic to China is 573, accounting for 41.49 % of the total species. Those species are the major elements of the constructive and dominant species of dominant vegetative types. The floristic elements of genera of seed plants of Shergyla mountains and other eleven floras are studied comparatively by group-average clustering respectively. The results shows that there is a high closed relationship between the floristic elements of Shergyla mountains and the higher altitude flora such as Taibai mountains, Zhongtiao mountains, Taihang mountains and Taiyue mountains, whereas it is significantly different from that of Lu mountains, Mulinzi and Shennongjia with the similar altitude.