Abstract: The pollen morphology of 12 species belonging to six sections of the Astragalus subgenus Pogonophace in China is presented in this paper. There are three sculpture types of the pollen exine, namely reticulate, perforate or fossulate, and foveo-reticulate sculpture. Though the 3-colporate is commonly exciting in the subgenus, but two types of aperture can be divided according to the ora being apparent or not.

Key words: Astragalus

摘要： 观察了国产黄耆属簇毛黄耆亚属6组12种植物的花粉形态。这些花粉的外壁表面纹饰可分为网状纹饰,穿孔或小沟渠状，以及穴网状纹饰3种类型。所有种类都具三孔沟的萌发孔，根据内孔明显与否可分为两类。虽然萌发孔类型与分组并没有严格的对应关系，但综合一些花粉特征，仍然发现6个组间花粉形态差异较为明显，与一般的形态差异有一定的对应性。特别是Sect.Robusti比较特殊，根据花粉大小等特征，推测它和Sect.Phyllolobium等有可能是本亚属的原始类群。Sect.Sesbanella的两个近缘种Astragalus heydei和A.hendersonii，花粉形态却很有区别。Sect.Bibracteola种类较多，有24种，花粉形态呈多样性。总之，花粉形态在簇毛亚属中具有一定的系统学意义。

关键词: 黄耆属, 簇毛黄耆亚属, 花粉形态, 变异, 分类意义