Abstract: Abstract The Asian genus Mosia comprises over 20 species of which about half occurs in China. The present paper deals mainly with an analysis of the phenctic variation patterns of populations of the five species of Mosia occurring in the Yangtze Delta region using numerical taxonomic methods complemented by data of ecology, cytology and seed set after sclfing in order to evaluate the overall phonetic relationships among the species in the context of the characters used and to make some meaningful ideas concerning the phylogenetic affinities of the taxa in question.

Key words: Mosla

摘要： 本文应用数量分类学方法对长江三角洲地区5种石荠属植物的群体进行了表征变异式样的分析，并参照繁育方式、生态适应和染色体数目等证据，来揭示种内群体间变异式样的差异及其与环境条件的关系，并探讨了这些种可能的种系发生关系。笔者认为石荠属 Mosla在进化的早期就已经分化为两个大支，在分类上即表现为两个组-唇萼组和石荠组的分化。

关键词: 石荠属, 群体变异式样, 种系发生, 数量分析