Preliminary study on the pteridophyte flora of East Guangdong,China

Based on statistics,analysis and flora comparison,the flora of pteridophyte in East Guangdong were studied. The results showed that: the floristic composing were relatively rich,there were 258 species belonging to 45 families and 97 genera. 12 dominant families were Polypodiaceae,Dryopteridaceae,Athyriaceae,etc. and 10 dominant genera were Asplenium,Pteris,Dryopteris,Sellaginella,etc.,indicating that the pteridophyte flora of East Guangdong belonged to transition district of Old Tropic Region and East-Asian Region. The dominant floristic elements of species were Tropic and East-Asian,especially the Sino-Japan and Tropic-Asia elements. The elements of endemic to China were less than the local seed plant flora. Through the comparison with 6 other flora,latitude and altitude were considered the main factors that influenced pteridophyte flora.