马兰属花粉形态的研究

STUDIES ON THE POLLEN MORPHOLOGY OF KALIMERIS

本文对马兰属（ＫａｌｉｍｅｒｉｓＣａｓ．）９种３变种１变型的花粉形态进行了光学显微镜和扫描电子显微镜的观察和初步比较研究。花粉粒为近球形，极面观三裂圆形。具三孔沟。外壁表面具刺状纹饰。不同种类花粉大小和外壁表面纹饰不同，可以作为区分种类的依据或参考。据此，将多形马兰上升为种，羽叶马兰和羽裂叶毡毛马兰合并，甘川紫菀和高茎紫菀划归马兰属。

Pollen grains of nine species, three varieties and one form variation of the genus Kalimeris (Compositae) have been examined under light microscope (LM) and scanning electron microscope (SEM). All the species examined are characterized in having sub-globular pollen grains and tripartite global pollen grains on AMB. The size of the pollen grains ranges from 20.4μm to 32.3μm in the polar axis and from 20.4μm to 34.6μm in the longest equatorial axis. The ornamentation of the exine are splinter-shaped under SEM. The pollen grains are diverse in the size and the ornamentation of the exine, these differences can be taken as the base of identification. Kalimeris indica var. polymorpha has special ornamentation of the exine and can be elevated to the specifical level. Kalimeris shimadai f. pinnatifida is regarded as conspecies with Kalimeris pinnatifida based on the characters of leaves and pollen grains. Aster procerus and Aster smithianus are transferred to Kalimeris based on the characters of pollen grains and morphology, which gives support Hu Xiuying's taxonomic treatment.