中国西南地区濒危植物的区系地理研究

根据《中国植物红皮收》第一册，中国西南地区共有濒危植物（除去稀有和渐危植物）28科，41属，52种，笔者对这些植物的生活型、分布区类型、地理分布和植物区系分布的特征进行了分析，主要结果表明：从属性的分布区类型来看，西南地区37属濒危种子植物中，热带分布型有16属，占种子植物属的43.3%，温带分布型有19属，占51.4%，中国特有分布型只有2属，其中1属为西南地区特有属，说明属的特有分布现象不明显；从西南地区52种濒危植物的水平分布来看，有33种为西南地区特有种，占63.5%，说明种的特有分布现象明显；西南地区跨越了我国仅有的2大植物区，5个地区，植物区系成分复杂。

The Geographic Distribution and Floristic Analysis of the Endangered Plants in Southwest China

Based on the first volume of Red book of Chinese plants, there are 52 endangered plant species of 41 genera in 28 families (exclude vulnerable or threatened plants and rare plants) in Southwest China. The growth type, distribution patterns, and floristic features of those 52 species are studied . The main results show as the following. (1) From the analysis of the generic distribution of 37 genera of the endangered seed plants of SW China, we know that 16 genera are of tropical distribution which makes up 43.3% of the total generic number of the endangered plant, 19 genera are of temperate distribution which accounts for 51.4 %, 2 genera are of endemic distribution to China of which there is only one genus endemic to SW China. (2) From the analysis of the geographic distribution of endangered plant species of SW China, 33 species are endemic to SW China, which makes up 63.5% of the total number of the ebdangered plant species in this region. (3) SW China extends the only two floristic areas of China. The floristic elements of the endangered plants here are complicated.