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Thirteen sample clones of peach (Prunus persica) were compared by scanning electron microscope (SEM) for characteristics of their pollen exine pattern. The pollen grains studied were tricolporate and surface sculpturing patterns were striate. The result revealed that the sample clones were divided into 3 groups by pollen grain exine. The tricolporate grains were further divided into; 1) Baikmi Josaing, Nunome Wase (Pomok Josaing), having shallow ridge; 2) Hwangdo # 1, Ambergem, Kanto # 5 having narrow ridge. They exhibited generally longitudinal and continuous ridge with some whorling; 3) Subong, Red Gold, Prunus persica for. rubroplena having interwoven and whorled ridges. However they were not longitudinally oriented. In each exine pattern, width of ridges could be divided into those wider or narrower than 0.4㎛. The number of pores was apparent in a × 20,000 photograph of peach pollen exine. And that could be divided into those more or fewer than 20 per 0.05㎟. The exine patterns were distinctive enough to permit classification of the 4 cultivars of peaches such as Baikmi Josaing, Ambergem, Subong, Prunus persica for. rubroplena.
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