Abstract: The pollen morphology of 21 species, 17 genera and 6 families (Bretschneideraceae, Staphyleaceae, Connaraceae, Hippocastanaceae, Sapindaccae and Papaveraceae) has been examined under light microscope. 3 specics (Bre- tschneidera sinensis Hemsl.; Ellipanthiis glabrifolius Merr. and Argcmone mcxicana L.) were observed under scanning electron microscope. The present article discussed the palynological data mainly in relation to the classification and systematic position of Bretschneideraceae. The Brtschneideraceae is relatcd to the Connarceae and the Popoveraceae.

Key words: Bretschneideraceae

摘要： 本文观察了伯乐树科、省沽油科、牛栓藤科、七叶树科、无患于科、罂粟科，共6科、17属、21种植物的花粉形态。依据花粉资料，探讨了伯乐树科的系统位置。认为伯乐村科与无患子目中牛栓藤科关系较为密切。牛栓藤科较为进化，伯乐树科较为原始。与无患于目中其他一些科关系不明显。伯乐树科与罂粟科、豆科中云实亚科的花粉形态有某些相似，而伯乐村科较为进化。与辣本科、白花菜科花粉形态较少相似。

关键词: 伯乐树科, 省沽油科, 牛栓藤科, 七叶树科, 无患子科, 罂粟科, 花粉形态