Abstract: The pollen of 12 species from 10 genera,Kerria,Fillipendula,Rubus,Dryas,Geum,Potentilla,Sibbaldia,Agrimonia,Spenceria and Sanguisorba in Rosoidea(Rosaceae) in China systematically are studied in the present paaper.The above genera are with tricolporate pollen grains.The shaps of the pollen grains vary from subspheroidal to prolate.The pollen grain size is (16.06-31.88)μm×(15.03-35.70)μm. Amb 3-lobed cirular,colpi usually long but narrowed in two ends,rectangular form.The pollen grains of Sanguisorba filiformis are special for its ver wide central party,and covering with elliptic colpal membrance. Sculptural types of the subfamily Rosoideae are presented as bellow:foveolate,foveolate-striate,striate-reticulate,striate and spinulate. The sculptural categories of pollens in Rosoideae are the most complicated,compared with other subfamily in Rosaceae. Together with the stdies of the pollen morphology concerned in the subfamily of Rosoideae,several systematic questions are discussed.

Key words: Rosaceae, Rosoideae, Pollen morphology, Systematics