PRELIMINARY STUDIES ON FLORA AND DISTRIBUTION OF Aceraceae IN GUlZHOU PROVINCE

There are 37 species, 7 varieties and a subspecies of Aceraceae in Guizhou, which belong to 2 genera: Dipteronia and Acer. There are 145 species, 78 varieties, 16 subspecies and a forma of Aceraceae in China. The species of Aceraceae in Guizhou occupies 25.5% of the total of China.The quantitative statistics and analysis of the species of Aceraceae in China shows: 1. Southwestern, Central and South China are the distribution and differentiation center of Aceraceae family, especially Southwestern China. These areas are probably the origin areas of Aceraceae. That is to say, Cathay is the origin zones of Aceraceae. 2. Aceraceae in Guizhou has closer relation to Guangxi and Hunan than to other regionsIt reflects the evolution origins of Aceraceae in these regions in geologic times.According to the distributional comparative analysis of 37 species, 7 varieties and a subspecies of Aceraceae in Guizhou Province, we can divide them into 2 distributional patterns and 7 floristic geography elements: 1. SinoJapan distributional Pattern(6.7% of the total in Guizhou): (1)Cathaysia-type(31.1%)(2)Endemic in Guizho-type(20.00%)(3) Guizhou and Guangxitype(13.3%)(4) South China-type(8.9%);(5)Central China-type(6.7%);2. Sine-Himalayan distributional pattern(4.4%)(1) Yunnan and Guizhou plateau-type(6.7%)(2) Hengtuan Mountains-type(2.2%), in which Cathaysisia-type, Endemic in Guizhou-type and Guizhou Guangxi-type are the most flora elements in Aceraceae of Guizhou.Last, this paper analysis the distributional characters of Aceraceae in Guizhou: 1. The plants of Aceraceae in Guizhou are principally distributed in Southeastern, northeastern and south Guizhou. 2. The vicarious distribution in geography and verticality are very remarkable.