Abstract:Epidermal features of the leaves of 5 species in 3 genera of Calycanthaceae wereobserved under light microscope and SEM. In species of genera Chimonanthus,Sinocalycanthus and Calycanthus, the leaf trichomes all are unicellular and nonglandular,the upper and lower epidermal cells have the same shape with sinuate anticlinal walls, andthe stomata are of paracytic type, which can be attributed to the same familyCalycanthaceae. The evolutionary trend of stomata in the three genera is recognized as the guard cells at polar regions from having no T-shaped thickening to having，and the stomatal rim at both sides being from one rim to double rim.
