The floral differences among Impatiens L. are so complicated that there are many difficulties in taxonomy of the genus. Seed coat micromorphology characteristics play an important role in providing critical information on systematics. In the present study,the seed coat micromorphology of 24 species of Impatiens from China were observed and compared by scanning electron microscopy(SEM). The results showed that seed coat ornamentation in this research could be ascribed into 2 types as reticulate (including fi...