采用扫描电子显微镜（SEM）对13种花楸属（Sorbus Linn.）植物的花粉形态特征（包括形状、大小、萌发孔沟和外壁纹饰）进行了观察和分析，并在此基础上进行了聚类分析。结果表明：13种花楸属植物花粉均为单粒花粉，呈长球状或超长球状，极面观呈三角形，赤道面观呈长椭圆形；极轴长28.94～39.03 μm，赤道轴长14.50～20.16 μm；赤道面具3条萌发孔沟，根据萌发孔沟特点，花粉属于N3P4C5型；外壁纹饰以条纹状为主，还有条网状和穴状，部分种类具穿孔。聚类分析结果显示：石灰花楸〔S. folgneri （C. K. Schneid.） Rehd.〕、大果花楸（S. megalocarpa Rehd.）、秦岭花楸（S. tsinlingensis C. L. Tang）和水榆花楸〔S. alnifolia （Sieb. et Zucc.） K. Koch〕首先聚在一起，随后与北京花楸〔S. discolor （Maxim.） Maxim.〕和太白花楸（S. tapashana Schneid.）聚在一起，湖北花楸（S. hupehensis Schneid.）、华西花楸（S. wilsoniana Schneid.）和陕甘花楸（S. koehneana Schneid.）也聚在一起，而欧洲花楸（S. aucuparia Linn.）、朝鲜花楸（S. commixta Hedl.）、西伯利亚花楸（S. sibirica Hedl.）和花楸树〔S. pohuashanensis （Hance） Hedl.〕聚在一起。研究结果显示：花楸属植物的花粉形态特征可作为其种间分类的依据。

Pollen morphological characteristics （including shape， size， germinal aperture， and exine ornamentation） of 13 species in Sorbus Linn. were observed and analyzed by scanning electron microscope （SEM）， and on the basis， the cluster analysis was carried out. The results show that the pollens of 13 species in Sorbus are all singlegrain pollens， which appear long spherical or super long spherical with triangular on the polar view and long elliptical on the equatorial view. The length of polar axis is 28.94-39.03 μm， that of equatorial axis is 14.50-20.16 μm. There are 3 germinal apertures on the equatorial view， and according to characteristics of germination apertures， the pollen belongs to N3P4C5 type. The exine ornamentation is mainly striped， also has striped-reticulate and foveolate， and some species have perforations. The cluster analysis result shows that S. folgneri （C. K. Schneid.） Rehd.， S. megalocarpa Rehd.， S. tsinlingensis C. L. Tang， and S. alnifolia （Sieb. et Zucc.） K. Koch are clustered together at first， then clustered together with S. discolor （Maxim.） Maxim. and S. tapashana Schneid.， S. hupehensis Schneid.， S. wilsoniana Schneid.， and S. koehneana Schneid. are also clustered together， while S. aucuparia Linn.， S. commixta Hedl.， S. sibirica Hedl.， and S. pohuashanensis （Hance） Hedl. are clustered together. It is suggested that pollen morphological characteristics of species in Sorbus can be used as the basis of their interspecific taxonomy.