Abstract: The pollen morphology of all species in Saururaceae (Saururus chinensis, S. cernuus, Gymnotheca chinensis, G. involucrata, Anemopsis californica and Houttuynia cordata) has been examined under SEM, material was dehydrated in a Denton DCP-1 apparatus. The result shows: Pollen grains anasulcate, also 1-3% anatrichotomosulcate were found in the popula-tion of pollen grains in Houttuynia. Monad, heteropolar, bilateral, elliptic to globose. More or less psilate foveolate to rugulate-foveolate. Small to minute. Pollen morphology gives a sup-port to define Horttuynia, which is more advansed genus compare with Anemopsis.

Key words: Saururaceae

摘要： 对世界三白草科所属的4属6种植物的花粉形态进行了CO2临界点干燥处理后的扫描电镜观察。三白草科花粉粒为具远极单槽萌发孔的，其中仅发现蕺莱属花粉群体中有约占1-3%的远极三歧槽花粉。花粉单粒，异极的，两侧对称，长球形至近球形，体积7.93×9.65-11.65×10.29μm,表面较平滑，外壁具穴状或皱穴状纹饰。本文根据三白草科的孢粉学和形态学资料，讨论了科下属间的演化关系。

关键词: 三白草科, 花粉形态, 系统发育