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This study was attempted to clarify taxonomic relationships among 51 taxa in Pyrus, in which commercially cultivated Chinese and Japanese taxa as well as Korean native taxa were included, and to reevaluate the existing taxonomic system of Korean taxa. For these aims, UPGMA cluster analysis using 59 morphological characters was conducted. Fifty-one taxa were divided into 7 groups at Euclidean distance 10.5. Several Korean native taxa formed the same group with either Chinese or Japanese taxa, but most of taxa formed an independent group. Cheongdangrori, which showed low taxonomic relationships with other cultivated taxa, was considered as an interspecific hybrid between a large-fruited taxon within P. ussuriensis Maxim. and an unknown primary species, maybe, P. fauriei Schneid. Ingyebae and Cheongshilli were considered as a new forma of P. ussuriensis var. ovoidea Rehd. Keochang-Cheongshilli was a different taxon from P. ussuriensis var. ovoidea Rehder. However, it might be the same taxon with P. ussuriensis var. ovoidea f. dulcissirna Uyeki. Sandolbae and Chambae have different characteristics from P. ussuriensis Maxim. and P. ussuriensis var. macrostipes T. Lee, respectively. However, Haenam-Chambae was considered as P ussuriensis var. rnacrostipe.s T. Lee. Hwangshilli and Koesan-Hwangbae showed similar character features each other. They might be the same taxon with P. ussuriensi.s var. ovoidea f. major Uyeki, and P. ussuriensis var. ovoidea f. ovata Uyeki, respectively. Tunggeullaebae and Kkulbae, Cheongseori, Pyeongchang-Suhyangri, and Yeongmokri could be classified as varieties of P. ussuriensis Maxim., because of their fruits with persistent calyx and setosely serrate leaf margin. Changseong-Cheongbae, Ulleung-Cheongbae, Hoengseong-Cheongri, and Satangbae, which showed low taxonomic relationships with other Korean native taxa and have fruits with deciduous calyx, had close relationships with Japanese taxa.
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