Abstract:Pollen grains of 26 species of genus Rhododendron L.and Menziesia Smith.were observed by light microscope(LM)and scanning electron microscope(SEM),and most of them were examined for the first time.All of the pollen grains of genus Rhodotendron and Menziesia are arranged in tetrahedral tetrad and the shape of tetrad is orbicular triangle and adjoin tightly.