Studies on flora of seed plants in Xialei Natural Reserve,Guangxi

Based on field survey,classification and identification of herbarium collection,the flora of seed plants in Xialei Reserve was analyzed.The results indicated that:(1)the flora of Xialei Natural Reserve was rich.There were 182 families,637 genera,1 069 species(including varieties,subspecies and forms).Of all the plants,there were 65 fern species,belonging to 44 genera and 24 families;4 gymnosperm species,belonging to 3 genera and 3 families;1 000 angiosperm species,belonging to 589 genera and 150 families.(2)the reserve was in transitional region of tropical zone and subtropical zone,so the tropical marginality was obvious.The tropic elements were slightly higher than temperate elements,and R/T was 4.75.(3)the origin of the flora was ancient,and geographical composition was complicated.(4)the flora had obvious karst characteristics.(5)there were some rare and endangered plants in the flora,including 14 national key protected wild species.The all results showed that the flora belonged to Paleotropical Kingdom-Malaysian forest flora-Tonkin-Gulf floristic region.