Preliminary study on the fern resource and flora in Jinfo Mountain

Jinfo Mountain locates at the south of Chongqing,belongs to the subtropical humid monsoon climate areas. The fern flora in this mountain is very abundant,which is about 458 species (including varieties and subspecies) represent 107 genera and 46 families,a few of those are precious plants. There are 14 monotypic families,16 minor-species families (between 2 to 5 species),12 multi-species families (including 6 to 19 species),1 macrospecies family (including 20 to 49 species) and 3 extra-species families,occupied 30.43%,34.78%,26.09%,2.17% and 6.53% of the total family number of fern in this Mountain respectively. About 54.35% of the family of fern are tropical species,the distribution patterns of genera are classified into 12 types and most of those are monotypic or minor-species genera. The topical character is enrich with 55 genera,which is about 51.40% of the mountain. At the same time,the fern flora is arohaic,relic and pristine ,Endemism is notable. It is closely related with the Wuling Mountain and Daba Mountain in fern area of gennera,and distant with that of Jiuhua Mountain,Hualong Mountain,Qiyun Mountain and Yun Mountain. The distributing model of East Asia,cosmopolitan and the north temperate zone and the disconnected distribution from Tropical Asia to Tropical Africa affect the character of fern flora of Jinfo mountain at most,and that of tropic Asia and those between east Asia and north America affect least. So it is consistent with the opinion that East Sichuan and Western Hubei Province is one of the three endemic centers in China and Jinfo Mountains is locate at this center.