Abstract: The leaf epidermis structures of 12 species, which belong to Sedum from Anhui province in China, have been examined under LM and SEM. The stomatal size, stomatal density and stomatal index were measured and counted under LM. Under SEM, it was discribed such as the shape of stomata, cuticular membrane, wax ornamentation, outer stomatal ledge (or rim) and trichome. The results show that the type of stomatal apparatuse in Sedum is the kind of tipical anisocytic type. The characters, such as the type of stomatal apparatuse, shape and pattern of anticlinal walls of epidermis cells, culticular membrane and wax ornamentation, are less important between species and can be used as secondary ones. The features of stomatal size, distribution, density and trichome possess the classific value of species.

Key words: Leaf epidermis, Stomatal apparatus, Sedum