Floristic geographical analysis of seed plant in Nanyue Hengshan

Based on field and plot investigation combined with consulting relevant documents,the floristic geographical element of seed plant in Nanyue Hengshan was studied.The results showed that there were 164 families of seed plant,which could be grouped into 12 distribution types and 8 subtypes.Among them there were 692 genera grouped into 14 distribution types and 18 subtypes,1572 species grouped into 14 distribution types,11 subtypes of China non-endemic species and 13 subtypes of China endemic species.The type of distribution and change of seed plant groups especially that of the genera was complex and the relation between them was extensive.The effect of different distribution types on the geographical property of flora was different.The genera distributional type of 14,9,3,7 and 8,and the species distributional type of 15,8 and 14 had the most effect on elements of vegetation.Proportion of widespread element of family held 33.54% while that of genera held 8.52% and that of species held 4.58%.Proportion of tropical element of family held 62.38% while that of genera held 46.29% and that of species held 25.67%.Proportion of temperate element of family held 37.61% while that of genera held 53.71% and that of species held 74.33%.The most element of family was tropical,the element of genera was both tropical and temperate,and the most element of species was temperate.The flora of seed plant was typically sub-tropical and the floristic characteristic was of west East-China.There were 1 family,16 genera and 533 species of endemic in China,among them 11 species of endemic in Hunan and 1 species of endemic in Nanyue Hengshan.