The pollen grains of 32 species, 1 subspecies and 4 varieties of Vitis and 1 species of

Muscadinia were scanned with Hitachi S-800 scanning electron microscope and described in the pr-

esent paper. In Vitis, the pollen morphology is found to be valuable for the identification of species,

though it is of little significance in supraspecific classification and systematic consideration. The ornamentation of Vitis could be divided into four types: ( 1 ) The pollen grains are oblate or rarely

spheroidal (P/E =0.97 ～ 1.08) in shape, with colpi wide enough to show dense granulae inside.

The pollen grains of V. coignetiae Pull. Ex Planch. belong to this type. (2) The pollen grains are

prolate to subprolate (P/E = 1.25 ～ 1.76 ), with sparse granulae within the colpi. This type in-

cludes l0 species, 1 subspecies and 3 varieties, such as V. hui Cheng etc. (3) The pollen grains

of V. romanetii Roman du Caill. ex Planch. and V. davidii (Roman du Caill. ) Foex. var. fer-

ruginea Merr. et Chun are prolate (P/E= 1.87 ～ 2.1), with colpi narrow and linear-shaped, but

rhombic in the equational region. (4) The pollen grains are prolate or perprolate (P/E= 1.30 ～ 2.

0), with narrow and linear-shaped colpi. The species with this type of pollen grains are Muscadinia