关键词: 植物区系, 种子植物, 武陵山地区

Abstract: Wulingshan region is located between 27°28'N and 30°05'N, 109°02'E and 111°33'E, from to 189.4m to 2570m above sea level, with an area of about 100, 000km². In this paper, some statistics and comparatively intensive analysis on native seed plants of Wulingshan region were given on family, genera and species, the results show that:(1) The flora is rather rich, there are 4119 species belonging to 1005 genera and 201 families. In which, 36 species belonging to 6 families and 19 genera are Gymnosperm plant, 3447 species belonging to 166 families and 781 genera are Dicotyledoneae plant, 636 species belonging to 29 families and 205 genera. Those families and genera which consits of one or less species takes lagest proportion. The tree plants are also rich(1972 species);(2) Geographical elements of family are dominant in tropical(91 families), 40 families belonging to Cosmopolitan family and 70 families to Temperatical family. Cosmopolitan family and Tropical family including a lot of species, but mostly typical families are subtropical and temperate familiy(especially E. Asia and Endemic to China);(3) there are 14 areal-types of 15 types of genera to China(C. Y. Wu, 1991), in which N. Temperate, Pantropic and E. Asia are dominant. 64 genera(takes 6.83% of total) are Endemic to China, some of them origin in Wulingshan region and its neighbors. Temperate genera are more over teopical genera;(4) There are 15 areal-types of species in the region, most of them belonging to E. Asia and Endemic to China which dominanted in subtropical. There are 2682 species belonging to China endemic elements. In which, 126 species belonging to endemic to Wulingshan region, 675 species belonging to endemic to C. China, other 1881 species can be divide into 10 subtypes distributed in every area of China. The geographical elements of species have decided the character and feature of Wulingshan region seed-plant flora:Based on archaic tropical flora and changed into temperate or subtropical mountanious flora of E. Asia. According to some East-Asian elements distribution patterns and migration routes, Wulingshan region is not only a part of the center of East-Asian elements but also a channel(Wulingshan hall) located on the middle of migration route in west-east direction of East-Asian elements, so we can think it a key region of E. Asia flora.

Key words: flora, seed plants, Wulingshan region