绣球亚科花粉形态的研究

借助光学显微镜和扫描电镜观察了绣球亚科９属３１种植物的花粉形态．本亚科的花粉多为近球形至近长球形，少数为扁球形．多具三孔沟。在叉叶蓝属观察到了极度缩短的花粉沟．花粉外壁表面纹饰为具颗粒状或棱形突起、孔穴状或明显网纹，表现出一定程度的变异．花粉形态表明黄山梅属在本亚科与其它属具一致性，冠盖藤属和钻地风属亲缘较近．绣球属花粉形态所表现出来的变异范围大致将其它几属的都包括在内了，表明绣球属可能在本亚科演化上处于一个中心位置。花粉形态结合外部宏观形态又表明绣球亚科各属之间没有十分明确的界限，存在着复杂的性状上的重叠．

A STUDY OF POLLEN MORPHOLOGY OF HYDRANGEOIDEAE(HYDRANGEACEAE)

Pollen morphology of 31 species in 9 genera, belonging to subfadrily Hydrangeoideae, was examined by means of microscope and scanning electron microscope. The shapes of pollen grains of most species are subspheroidal and subprolate. Apertures basically with tricolporate, in Deinanthe caerelea it shows a reduced non-meridional furrow. Omamentaion of exine ranges from perforate with or without granules to apparent reticulate. Xirengeshoma shows similarity to the remainder of the subfamily. A particularly close relationship of Pileostegia and Schizophragma is indicated. Hydrangea shows great variation, and is closely linked to other genera, suggesting its central place of evolution in Hydrangeoideae. The present observation also indicates that generally, there is no clear cut discrimination of groups in Hydrangeoideae and they overlap each other complexly.