湖北铁线莲属的区系特征及地理分布

在查阅文献和标本采集鉴定的基础上，确认湖北铁线莲属(Clematis L．)有37种14变种。对湖北铁线莲属的区系地理进行了分析。铁线莲属的分布中心在中国的亚热带地区，在中国范围内云南和四川分布的种类最多(包括变种)，然后以此为中心向四周的分布逐渐减少。湖北铁线莲属大部分种类分布在鄂西山区。湖北铁线莲属的地理成分以中国特有分布为主，中国特有成分占湖北种类总数的68．6％。区系的性质是温带性的。根据毛茛科最原始的类群金莲花亚科Subfam．Helleboroideae起源中心的推测和铁线莲属古老类群的分布，推测铁线莲属起源于中国西南地区，并以此解释湖北铁线莲属区系和周围省份铁线莲属区系的关系。

Studies on the Floristic Characteristics and Geographical Distribution of the Genus Clematis Linnaeus from Hubei, China

In the present paper 37 species and 14 varieties of Clematis from Hubei Province are recognized based on extensive identification of specimens and review of literature. The genus Clematis is widespread throughout the world and its distribution center is situated in the subtropical regions of China. The Clematis species are richest in Yunnan and Sichuan from where the total species numbers of Clematis in other provinces decrease gradually in all directions in China. Most of the species of Clematis from Hubei concentrate in the west montane region of Hubei. The geographical elements of the flora of Clematis are rather simple, of which Chinese endemic elements are dominant, amounting to 68.6% of the total species from Hubei. Therefore its nature is temperate. According to the distribution of the primitive groups of Clematis and the conjecture of the origination center of the primitive taxa of Ranunculaceae Subfam. Helleboroideae, it is assumed that Clematis originated from Southwest China. And in the light of this assumption we explain the relations between the flora of Clematis from Hubei and those from neighbouring provinces.