中文摘要：

应用光学显微镜和扫描电子显微镜对中国西南部横断山区夏季开花的27科43属46种2变种植物的花粉形态进行了观察和研究，并对花粉形态进行了细致的描述。结果表明，花粉类型以近长球形-长球形和长球形为主，分别为27．1％和25％，还有少量的为球形，近球形-近长球形，近扁球形和四合花粉。萌发孔以3孔沟为主，占43．8％，还有3沟，散孔，多沟，三拟孔沟，6-沟，单沟等类型。外壁纹饰以细网状为主占50％，还有粗网状，细颗粒状，光滑，刺状纹饰等。这些物种的孢粉学特征为第四纪地层孢粉研究提供了现代孢粉学依据。此外在花粉形态性状基础上，通过SPSS软件聚类分析，对部分同科物种间的鉴定特征进行了讨论分析，并根据植物的生态学特性讨论了它们的生态环境指示意义。

英文摘要：

Pollen morphology of selected taxa from the Hengduan Mountains, Southwest China are investigated in the present study. Forty-eight taxa （flowering in the summer, 46 species and 2 varieties） of 43 genera belonging to 27 families were observed by light and scanning electron microscopy. Pollen morphology is described in detail. Two pol- len shapes are mainly found in these species： subprolate to prolatc （27.1%） and prolate （25%）. Spheroidal, sub- spheroidal to subprolate, suboblate and tetrad shapes can also be found in some species. Aperture type is mostly tri- colporate, with a percentage of 43.8, and also contains trieolpate, pant0porate~ stephanocolpate, 3-colporoid, 6- colpate, monocolpate. The most common ornamentation is finely reticulate, with a percentage of 50. Other exine or- namentations, such as coarsely reticulate, finely granulate, smooth, spinulose are also observed. The palynological documentation of these species will provide the modern palynologieal basis for paleopalynological studies of the Qua- ternary Strata. On the basis of pollen morphology characters, identification features of some species in the same fami- lies were discussed according to the results of cluster analysis used by SPSS. The ecological significance was also dis- cussed based on the ecological properties of these taxa.