Epidermal characters of mature leaves in 12 species were investigated under both light microscope(LM) and scanning electron microscope(SEM).It was shown that the stomata were irregular and existed in abaxial epidermis in all the species examined,and in the adaxial epidermis in some species.The leaf epidermal cells were usually irregular or polygonal in shape.The patterns of anticlinal walls were slightly straight,sinuolate or sinuous.Under SEM,the inner margin of the outer stomatal rim was nearly smooth,sin...