中文摘要：

对海南省18个市（县）的假臭草地理种群进行RAPD—PCR聚类分析，将海南假臭草地理群分为5个类群：其中澄迈、海口、文昌、临高、儋州、昌江为一类群，东方、乐东、三亚、保亭、五指山、琼海、万宁、陵水、定安为一类群，屯昌、白沙、琼中各为一个类群。通过NTsys—pc2．10数据处理，分析各假臭草地理群的遗传相似系数，其遗传相似系数范围在0．5396825-0．9047619之间，说明快速进化是假臭草生物入侵的一种手段。

英文摘要：

Geographical diversity of Praxelis clematidea from eighteen various cities in Hainan were divided into five groups by RAPD-PCR cluster analysis. The first group included those from Chengmai, Haikou, Wenchang, Lingao, Danzhou and Changjiang. The second group consisted of those from Dongfang, Ledong, Sanya, Baoting, Wuzhishan, Qionghai, Wanning, Lingshui and Ding＇an. Those from Tunchang, Baisha or Qiongzhong belonged to another group. The genetic similarity coefficient of each geography group of Praxelis clematidea was analyzed via NTsys-pc2.10 data processing. The genetic similarity coefficient ranged from 0.539 682 5 to 0.904 761 9, suggesting that rapid evolution was one of the methods for Praxelis clematidea biological invasion.