为探讨湘西南山地植物区系特征，分析了龙底自然保护区种子植物区系组成及其单（寡）种属的组成与特性，结果表明：保护区有野生种子植物188科859属2 174种，其中裸子植物8科15属21种；植物区系中有单（寡）种属183属，归属于83科，含209种，占区系中总属数的21.30%。单（寡）种属能表征该区植物区系的古老残遗性、特有性和亚热带常绿阔叶林区植被组成特点，能表现出植物的演化阶段与过程；单（寡）种属同植物区系中所有属的生长型组成比例与生活型谱间存在差异，但也具有一些相同的组成变化规律；植物区系属的分布区类型以热带成分为主，而单（寡）种属以温带成分为主。单（寡）种属以中国特有属、东亚特有属和热带亚洲特有属占优势。%In order to study the floristic characteristics of spermatophytes, floristic composition of spermatophytes and characteristics of monotypic （oligotypic） genera in Longdi Protection Zone were analyzed. The results showed that ：wild spermatophytes flora in the protection zone is made up of 2 174 species in 859 genera of 188 families, among which, gymnosperms take 21 species in 15 genera of 8 families. Monotypic （oligotypic） genera of flora is made up of 209 species in 183 genera of 83 families ,taking 21.30% of the whole flora in this area. Mouotypic （oligotypic） genera can not only display its nature of relict and endemism, and the vegetation composition characteristics of subtropical evergreen broad-leaf forests, but also reveal the stage and process of plants evolution. There are some differences between monotypic （oligotypic） genera and the whole floristic genera in composition proportion of growth form and life-form spectrum. The distribution types of the floristic genera are mainly tropical components while monotypic （oligotypic） genera are mainly temperate components. Monotypic （oligotypic）genera have an advantage in Chinese emdemic genera, endemic genera to eastern asia and asian endemic genera in tropical zone.
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