Abstract: This study presents a detailed survey and discussion on the pollen morphology and structure of seven species of Heteropappus with light microscope (LM) and scanning electron microscope (SEM). Measurements of the polar axis and equitorial diameter, exine thickness,spine length, and spine number at each lobe are made.The principal diferences in pollen among various species are in size, shape and subtle variations of the surface ornamentation. The pollen grains of Heteropappus are similar to those of Galatella, suggesting a close relationship between these two genera. These two genera can be viewed as the satellite genera of Aster.

Key words: Compositae