The morphological characters of leaf epidermis of 9 species and 2 varieties (21populations) of Ostericum Hoffm. were investigated by scanning electron microscopy (SEM). The leaf epidermal surfaces of Ostericum are smooth normally, and epidermal cell contours are invisible or distinct with polygonal or irregular shape or invisible. Most primary waxy ornamentations are dense stripes (thick), and some species have single or double ridged secondary or namentations, or branched or granular attachment structures; the abaxial epidermals also have stripes waxy ornamentations, which are evenly distributed for most species, while for a few species the waxy ornamentations only occur around the stoma or convex/concave parts, and stomatal shape is ellipse or fusiform with rough or smooth surface. These results show that the morphological characteristics have certain intraspecific stability and interspecies diversity, especially the width and the density of the primary ornamentation, the secondary ornamentation and the shape of the stomatal apparatus, which are probably have a potential significantce for the genetic relationship and taxonomic revision of the genus and its members.