Research on plant flora of Shiwandashan Mountain National Natural Reserve in Guangxi

The statistics and analysis of the flora of Shiwandashan Mountain National Natural Reserve is reported in this paper.The results indicate as follow:(1) The flora of Shiwandashan Mountain National Natural Reserve is characterized with rich species and it is now known that there are 2 233 species(including varieties,subspecies and forms) which belong to 912 genera and 219 families.Of all the plants,there are 150 species of fern plants,belonging to 76 genera and 30 families;16 species of gymnosperm,belonging to 9 genera and 8 families;2 067 species of angiosperm,belonging to 827 genera and 181 families.(2) There are rich endemic elements in this area with 1 Chinese endemic family and 9 Chinese endemic genera.The genera of single-species and few-species account for high percentage of the total genera.(3) The flora derives from ancient origin,the rare and endangered plants are abundant.There are 15 species belonging to the national key protected wild plants,among which 2 species belong to the first class national key protected plants,and 13 species belong to the second class national key protected plants.(4) The reserve is in transitional region of tropical zone and subtropical zone,and the flora shows conspicuous characteristics of the tropical margin.About floristic elements of genera,tropic elements are slightly higher than temperate elements,and R/T is 4.56.(5) This area has characteristics of dominant woody plants(percentage of 47.5%) and the species of vines make up 13.6%,besides the forest landscape is remarkable.In a word,the plant flora of Shiwandashan Mountain National Natural Reserve shows a flora characteristic of Paleotropical Kingdom-Malaysian forest flora-Tonkin-Gulf floristic region,and the forest flora also shows characters of marginal tropics.