石竹科繁缕属(Stellaria L.)和孩儿参属(Pseudostellaria Pax)的关系一直备受关注。为了弄清它们之间的关系及属下分类等问题, 选择繁缕属22种和孩儿参属8种, 共30种植物51个形态特征, 利用NTSYS-pc 2.10e软件中的UPGMA聚类分析方法和主坐标分析方法, 对这2个属进行数值分类学研究。结果表明, 繁缕属与孩儿参属是2个自然类群, 除繁缕属的繁缕(S. media (L.) Cyr.)和鸡肠繁缕(S. neglecta Weihe ex Bluff et Fingerh)在聚类中不能分开外, 其它物种都能很好地分开。两属有较近的关系, 其中巫山繁缕(S. wushanensis Williams)是过渡种。此外, 数量分类结果建议将细叶孩儿参(P. sylvatica (Maxim.) Pax)作为一个独立组处理。对性状的主坐标排序分析显示, 根的形状、叶缘质地、花的形态(是否具花瓣、花瓣长度、花瓣裂数、深裂还是浅裂)和种子表面纹饰(是否具齿轮状、疣状突起)等在繁缕属与孩儿参属的分类中具有重要作用。

The phylogenetic relationship between the genera Stellaria L. and Pseudostellaria Pax. is a focus of attention. In this paper, we describe the numerical taxonomy of 30 species of Stellaria and Pseudostellaria with 51 morphological characters. Principal coordinate analysis (PCoA) and UPGMA clustering analysis of NTSYS-pc (v2.10e) were used to analyze the generic relationships. Stellaria and Pseudostellaria form two distinct groups. All species were separated easily, except for S. media and S. neglecta. The results support a close relationship of Stellaria and Pseudostellaria, with S. wushanensis as the transitional type. Otherwise, P. sylvatica should be considered as an independent section. PCoA revealed that characters such as the form of the root, leaf margin texture, the form of flower (having a petal, petal length, petal lobes, lobed or deep lobed) and the seed coat (whether it has a cogwheel or is verrucose) play an important role in species delimitation.