Study on the pteridoflora in Southwest of Zhejiang Province

The pteridoflora in Southwest Zhejiang Province are composed of 396 species(including all kinds of varieties),99 genera,46 families. The representative families are Dryopteridaceae, Polypodiaceae,Athyriaceaea and Thelypteridaceae. The main genera are Dryopteris,Arachniodes,Asplenium,Selaginella and Cyclosorus. The flora elements from varieties of geographical types are complicated. This pteridoflora is not only subtropical in nature,but with some temperate elements. This pteridoflora origin can be traced back to ancient times,many of whose families,genera and relic species are ancient ones. This pteridoflora is rich in species which are endemic to Southwest China. This area is closer to its adjacent area,the sequence of pteridophytas floristic relation between Southwest Zhejiang and adjacent regions can be Southwest China,South China,Japan,Central China,Taiwan,North China,Northwest China,Tibet,Northeast China.