Abstract: Pollen grains of 15 species representing 6 genera in the Polygonaceae were examined under scanning electron microscope (SEM) and mission electron microscope (TEM). The results are summarized as follows: (1) The ornamentation of exine is granulate-perforate, microechinate-perforate, microechinate-perforate-smooth, granulate-perforate-smooth,finely reticulate, coarsely reticulate, or rugulate, granulate. (2) Under TEM all of the taxa examined generally have the exine stratification typical of the dicots:
tectum, columellae, foot layer and endexine, although differences in the development of each of these units have resulted in variation in the exine structure.

Key words: Polygonaceae, Pollen exine, Ultrastructure