海南岛紫金牛属植物地理分布及区系特征

运用平均聚类法（UPGMA）对海南岛各市县紫金牛属植物的水平分布进行聚类分析,结果表明,海南岛中部为紫金牛属植物分布最丰富的地区,尤以保亭县的种类最丰富;垂直分布海拔集中在400～1 000 m范围,有7种分布范围较狭窄;分布区类型有2种分布型和2种分布亚型,其中以越南（中南半岛）至华南（或西南）分布亚型为主,其次是中国特有分布型,与邻近省区的广东、广西联系最紧密,其中与广东最相似,但与广西的共有种类最多;与邻国的中南半岛联系最紧密,而与马来群岛的联系较弱.

Floristic Character and Geographical Distr ibution of Ardisia (Primulaceae) in Hainan Island

The average cluster method （UPGMA） was used to analyze the horizontal distribution of Ardisia plants in the cities or counties of Hainan Island. As a result, the central region of Hainan Island is the most abundant area for Ardisia, especially in Baoting County. The vertical distribution of Ardisia was concentrated in the alti- tudes ranging from 400 to 1 000 m, and 7 species were distributed narrowly. Ardisia was distributed in two types and two subtypes, but mainly in the subtype from Vietnam （or Indo-Chinese Peninsula） to S. China （or SW. China）, followed by the type of Endemic to China. The Ardisia plants in Hainan Island had close relationships with those in the neighboring provinces Guangdong and Guangxi, the most similar to those in Guangdong and the most common with those in Guangxi. The Ardisia plants in Hainan Island had significant relation with those in the neighboring area of Indo-Chinese peninsula, but not obvious relation with those in Malaysia.