A Preliminary Study on Flora of Spermatophyte in Tongbiguan Nature Reserve in Yunnan

The flora of the seed plants in Tongbiguan Nature Reserve is studied initially.There are 201 families,1 202 genera,and 3 517 species of seed plants recorded from Tongbiguan,including 911 species that are endemic to China.In the floristic composition of the seed plants,the families of tropical distribution make up 74.67% of the total family number,while those of temperate distribution make up 25.33%.The statistics of the genus areal-types shows that the genera of tropical distribution make up 74.21% of the total genus number,while those of temperate distribution contribute 25.79%.Furthermore,the genera of tropical Asian distribution contribute 28.17% of the total sum of the genera.High percent of tropical distribution elements show that this flora is obvious of tropical Asian characteristics,a part of Yunnan,Myanmar and Thailand region of Malaysian forest flora.Occurring in the northern margin of tropical Southeast Asia,the flora also shows characters of marginal tropics.