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.