Abstract: There are 235 species of ferns (including subspecies) in Hengshan Mountain, belonging to 75 genera in 36 families.Analysis on the flora showed that:the ferns not only have strong tropical nature, but also show the obvious transitional characteristics from tropical to temperate.Most of families and genera in this flora are subtropical flora and tropical flora, while the main of species' flora is temperate flora.It includes 18 families, 38 genera and 69 species in tropical flora and subtropical flora, respectively occupying to 50.00%, 50.67% and 29.36% of the total families, genera and species.Among them, there are 14 families, 21 genera and 5 species in pan-tropical flora and 3 families, 18 genera and 158 species in temperate flora, accounting for 38.89%, 28%, 2.13% and 8.33%, 24%, 67.23% of the total families、genera and species respectively.What is said above shows that the most important flora of families and genera is pan-tropical flora, and temperate flora is the dominant flora of species, which explain tropical flora and temperate flora is intersecting and compatible.There are not endemic genera but 1 endemic species in the flora, and endemic species of China are very plentiful with 46 species and 19.57% of the total species.The flora contact with neighborhood nearly, and their geographical components are East China components predominantly.Hengshan Mountain is similar to Wuyishan and Lushan in plant flora, but farther to Wanfushan.

Key words: pteridophyte, plant flora, distribution types, Hengshan Mountain

摘要： 南岳衡山蕨类植物共计235种(含种下等级),隶属于36科75属。区系分析表明:该地蕨类植物具有较强的热带性质,同时也显示出该区蕨类植物区系向温带渗透和过渡的性质,科、属的分布区类型均以热带、亚热带分布型为主,而种以温带分布型为主。热带、亚热带分布型在该区有18科38属69种,分别占科、属、种数的50.00%、50.67%和29.36%;其中泛热带分布型有14科21属5种,分别占科、属、种数的38.89%、28.00%和2.13%;温带性分布型有3科18属158种,分别占科、属、种数的8.33%、24.00%和67.23%。表明泛热带分布型是该区科、属最重要的分布类型;在种的区系上,温带性成分占明显优势,反映了该区热带成分与温带成分的交汇与兼容。该区虽没有自己的特有属,但具1种特有种,而且中国特有种丰富,共计46种,占总种数的19.57%。该区系与周邻联系广泛,地理成分以华东成分为主。在区系关系上,该区与武夷山、庐山的关系密切,而与万佛山的关系较为疏远。

关键词: 蕨类植物, 植物区系, 分布区类型, 南岳衡山