石竹科繁缕属(Stellaria L.)和鹅肠菜属(Myosoton Moench.)的系统关系一直存在争议。为了弄清它们之间的关系及属下分类等问题, 选取55个形态特征对繁缕属和鹅肠菜属进行数量分类学研究。聚类分析和主坐标分析结果显示, 鹅肠菜(M. aquaticum (L.) Moench.)与繁缕组繁缕亚组的关系较近, 故支持将鹅肠菜属并入繁缕属。此外, 研究结果还支持将繸瓣组作为独立的组。对性状的主坐标排序分析显示, 茎的形状及是否被毛、叶长、叶宽、是否具叶柄、叶形及毛被、上下表皮气孔指数与密度、是否具花瓣及花瓣裂片数、雄蕊数目、蒴果长度、花柱与种子的数目、种子表面纹饰等性状特征是繁缕属与鹅肠菜属分类的重要依据。
The phylogenetic relationship between Stellaria L. and Myosoton Moench. is always controversial. To clarify the relationship and their genus classification, we studied Stellaria L. and Myosoton Moench. by numerical analysis of 55 morphological characters. According to cluster analysis and principal coordinate analysis (PCoA), the Myosoton aquaticum is closely related to sect. Stellaria, especially subsect. Larbreae. Thus, the genus of Myosoton should be reduced to Stellaria, and the section Fimbripetalum should be considered an independent group. PCoA results showed that some characters have played an important role in species classification, including the form of the stem and whether it has a coat, the leaf length and width, whether it has a petiole, the leaf form and coat, stomata index and density. Moreover, other characters that have played a crucial role include the existence of petals and the number of petal lobes, the number of stamens, capsule length, the number of styles and seed, and surface features of seeds.
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