关键词: 华中地区, 藤本种子植物, 区系

Abstract: Hunan Province and Hubei Province are located at N24°39′~ 33°20′and E108°21′~ 116°07′, belonging to subtropical monsoon zone, where climate is warm and wet,and terrain is complex. Vines are very rich in the area, but its research is virtually a blank. In this paper we studied on the flora of the seed vines in Central China region, choosing Hunan Province and Hubei Province as the representative. Based on statistics of plants list of the area, there are 838 species of seed vines belonging to 175 genera in 62 families, of which 784 species of 159 genera in 60 families are native. We analyzed the speciality of seed vines flora at the families, genera and species levels in depth and discussed the relationship of the seed vines in Central China region with its neighbouring regions and the differentiating zones within the area. Our results showed that the seed vines accounts for 11% of the total seed plants in Central China region and 61.7% of the total seed vines were concentrated on the large families with 30 species or more. Its Tropical members are obviously more than in the Temperate. The members of the Pantropic, the Tropic Asian, the E.Asian (especially Chinese) endemics and the E.Asian-N.America disjuncted patterns at the family and genera levels were relatively rich, and many of them were archaic elements. Moreover, there were rich endemic elements in the area with one E.Asian endemic family, 6 Chinese endemic genera and 507 Chinese endemic species including 35 endemic species to the Central China region. The flora of the seed vines of Central China region was characterized with rich species, diversity arealtypes, rich endemic and archaic elements. Compared with the seed flora of the Central China region, the seed vines flora was of relatively strong tropical characteristics and shared more geographic resources with Himalayan region and the southwest of China.

Key words: Central China, seed vines, flora