Abstract: 【Objective】 Pollen-morphological characteristics and relationship between pollen morphological characteristics and classification of Rosa hybrida var. minima cultivars were examined. 【Method】 Pollens of 10 miniature rose cultivars were examined by LM (Light Microscopy ) and SEM (Scanning Electron Microscopy). The cluster analysis was carried out based on the observation results. 【Result】 The pollen grains were tricalporate and 3-lobed circular in polar view. Different cultivars showed different exine sculpture and fringes，luminas and verrucate. The pollen shapes were spheroidal or super-spheroidal by P/E (Polar axis length / Equatorial axis length) criteria. The result of cluster analysis indicated that the cultivars could be classified into three groups when similarity coefficient was 0.37. The first group included White Koster, Pink Koster, Purple Ministar, Romantic and their pollen exine sculpture was of dense fringes and dense luminas. The second group included Gold Sun, Maddy, Dwarf Fairy, Hula Girl, Winter Plum and their pollen exine showed dense fringes, rare or bare luminas and verrucate sculpture. The third group included Red Cloud and its pollen exine showed rare and fringes rare luminas sculpture. Compared the palynological classification result with morphological classification result, it was found that they were similar and with little differences. 【Conclusion】 Different Rosa hybrida var. minima cultivars show a different exine sculpture. Palynological analysis could be used in the classification of Rosa hybrida var. minima cultivars and the result is supportive to the result of morphological classification.

Key words: Rosa hybrida var. minima, cultivars, pollen-morphological characteristics, classification