中国特有属─—东俄芹属的花粉形态及其分类学意义

利用光学显微镜和扫描电镜观察了伞形科东俄芹属（ＴｏｎｇｏｌｏａＨ．Ｗｏｌｆｆ）７个种的花粉形态，结果表明：除宜昌东俄芹Ｔ．ｄｕｎｎｉｉ（Ｂｏｉｓｓｉｅｕ）Ｈ．Ｗｏｌｆｆ和城口东俄芹Ｔ．ｓｉｌａｉｆｏｌｉａ（Ｂｏｉｓｓｉｅｕ）Ｈ．ｗｏｌｆｆ的花粉为矩形类型外，其它几种的为菱形类型，然而并非都是原始的或典型的菱形，而是处于分化过程中的菱形类型，如纤细东俄芹Ｔ．ｇｒａｃｉｌｉｓＨ．Ｗｏｌｆｆ，大东俄芹Ｔ．ｅｌａｔａＨ．Ｗｏｌｆｆ的花粉形态，表现出近菱形、近椭圆形和近矩形的特征，在我们近期的工作中曾涉及滇芎属ＰｈｙｓｏｓｐｅｒｍｏｐｓｉｓＨ．Ｗｏｌｆｆ类似的花粉形态及分化情况，从花粉资料启示，东俄芹属可能与滇芎属近缘。

POLLEN MORPHOLOGY OF TONGOLOA ,A ENDEMIC GENUS IN VHINA AND ITS TAXONOMIC SIGNIFICANCE

In present paper,pollen morphology of seven species of the genus Tongoloa from China was studied.They are concentrated in the Hengduan Mountains and some species extend to nearby area.The pollen grains were examined under LM and SEM. The result shows:Tbey are rhomboidal types except T. dunnii(Boissieu)H. Wolff and T. silaifolia(Boissieu)H. Wolff which are rectangular type. All the pollen grains are not original or typical rhomboidal types. T .gracilis H. Wolff,T.elata H. Wolff are presented various shapes i.e. subrhomboidal. subelliptical and subrectangular.This is a differential rhomboidal type. So we may consider that the evolutionary trends of pollen types were from rhomboidal type to rectangular type in the genus Tongoloa H. olff. In our earlier paper we touched similar pollen morphology in the genus Physospermopsis H. Wolff. The pollen information suggest that Tongoloa H. Wolff may be closely related to the genus Physospermopsis.