Studies on floristic of the rare and endangered plants and national conservative plants in SW China

Base on the Red Book of Chinese Plants(Vol.1)and the National Important Wild Conservative Plants List (List 1),we studied the floristic elements and the geographical distribution of the rare and endangered plants and national conservative plants in SW China. The results indicates that there are 275 species belonging to 195 genera and 95 families of rare and endangered plants and national conservative plants in SW China. The floristic elements have obvious tropical and subtropical characters,the number of tropical distribution genera accounts 48.57% of the total genera of the seed plant,and tropical distribution family accounts 46.91% of the total. There are 41 species of relic plants and 52 species of Chinese endemic plants. Furthermore,these plants have obvious uneven geographical distribution,and they mostly distribute in the national provincial adjacent areas and lower to middle mountains.