Abstract: Pollen grains of 30 species and 2 varieties from China, belonging to 5 genera (out of 36 species in 5 genera) of Hydrocotyloideae and Saniculoideae, were examined with light microscope and scanning electron microscope. 1.Six types of the pollen shape are recognized in Hydrocotyloideae and Saniculoideae from China, and their evolutionary trend is from rhomboidal→subspheroidal→ellipsoidal→subrectangular→superrectangular to equatorial- ly-constricted. 2.Pollen grains of Hydrocotyloideae are mostly ellipsoidal with P / E ratio 1.07-1.6, the polar axis 22.5-46μm long, the equatorial axis 13.75-27.5μm long, and with the size index 21.1-31.8.They are angulapeturate in the great majority, and the exine sculp- ture is recticulate under SEM. Those of Saniculoideae are mostly superrectangular or rectan- gular, with P/E ratio 1.3-2.1, the polar axis 35-65μm long, the equatorial axis 17.5- 42.5μm long, and with the size index 28.2-49.7. They are planaperturate in the great majori- ty and the exine sculpture is striate-reticulate or cerebro-reticulate under SEM. Therefore, the latter might be more advanced than the former. 3.Pollen grains of Dickinsia Franch., en- demic to China, are ellipsoidal,with P/E ratio 1.5,the polar axis 31.25-37.5μm long, the equatorial axis 20-25μm, and with the size index 27.81. They are angulaperturate, and the exine sculpture is cerebroid-reticulate under SEM. The genus is greatly similar to the mem- bers of Hydrocotyloideae in pollen morphology, which supports the treatment of the genus asa member of Hydrocotyloideae by Handel-Mazzetti (1933).

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