Abstract: We observed the leaf epidermis characteristics of six species from the genus Pseudostellaria in China under the light microscopy, measured and calculated the size and density of epidermal cell and stomata apparatus. The shapes of leaf epidermal cells are irregular, anticlines walls are repand or sinuate. The size of adaxial epidermis cell is about 61.7×95.8 μm-115.3×179.3 μm, the density is about 76-158 mm^-2, the size of abaxial epidermis cell is about 46.4×72.4 μm-91.9×150.4 μm, and the density is about 104-287 mm^-2. Most of species have stomata apparatus only on abaxial epidermis, the type of stomata apparatus is anomocytic, the density is about 30-143 mm^-2, and the size is about 21.5×28.6 μm-30.4×47.2 μm. The stomata index is about 19.5-31.6. Stomata is oblong and thickened at the ending parts. Pseudostellaria is related to Stellaria, and is a derived taxon.

Key words: Caryophyllaceae, Pseudostellaria, epidermis, characteristics