Abstract:The floristics of seed plants in coastal hilly areas of southern Hainan Island was studied on the basis of data of 6 600 m2 sampling plots and route survey. There were 876 species, belonging to 484 genera and 112 families. There were 78 families of Tropical elements, accounting for 69.64% of the total families. The Tropical elements at genus level were the dominant components, in which the Pantropic genera and Tropical Asian genera contributed 33.47% and 19.62% of the total (excluding cosmopolitan), respectively. There were 3 genera endemic to China, e.g. Merrillanthus, Hainania and Chunechites. At the species level, Tropical elements contributed 74.94% of the total number of species (excluding cosmopolitan). There were 204 species endemic to China, accounting for 23.13% of the total species, in which 78 species were endemic to Hainan. Compared with the seed plant flora in the northern Island, it had obvious differences in species composition, due to differences in natural landform and climate.
