Abstract: The leaf form and structure of 1 Mezzettiopsis species and 9 Orophea species were comparatively studied with the help of scanning electron microscope, epidermal maceration and paraffin section method. The results showed that there were three major anatomical differences between Mezzettiopsis and Orophea. In the leaf of Mezzettiopsis, each epidermal cell contained one cluster crystal, mesophyll tissue had one or two layer palisade tissue cells, oil cells were evenly distributed in the palisade and spongy tissue. and palisade tissue were non-contiguous in the leaf midrib.

Key words: Mezzettiopsis