A Study on the Floristic Diversity of the Communities with National Endangered Plant Disanthus cercidifolius var. longipes

Based on the analysis of the cluster and areal types of family and genera of seed plants by Wu Zheng- yi,the floristic diversity of 6 communities with Disanthus cercidifolius var. longipes in different areas(Sanqing Mountain,Jinggangshan Mountain,Junfeng Moutain and Guanshan Mountain in Jiangxi Province;Lianhuashan Mountain in Kaihua County,Zhejiang Province) were studied. The results showed that the floristic composition of the communities is complex,there are 283 species belonging to 170 genera and 50 families based on preliminary identification and statistics of all the communities. The distribution type analysis of families,genera and species indicated that the geographical elements are diverse. There are similarities and differences in the floristic characteristics of the 6 communities,there is extensive relationship among the florae. According to the floristic elements of families and genera,the tropical distribution is of the same ratio as the temperate one,indicating the transitional floristic characteristics from the tropic zone to the temperate zone. The floristic element clustering analysis showed that the florae of the 6 communities are closely related.