Numerical analyses using 36 morphological characters from 17 populations representing seven Korean species of Sedum subg. Aizoon were conducted to propose the hypotheses about species boundaries and their relationships. Cluster analysis of morphological data shows that S. middendorfianum was significantly isolated from the remaining species. The seven populations of S. aizoon were well clustered with each other. However, the Korean endemic species including S. zokuriense, S. takesimense, and S. latiovalifolium formed a cluster with S. kamtschaticum populations. The UPGMA tree also suggests that S. kamtschaticum could be one of the parental taxa of S. latiovalifolium, which has been considered to be of hybrid origin. PCA of morphological characters clearly separates S. middendorfianum from the remaining species, and separtes S. aizoon and S. latiovalifolium. However, S. ellacombianum, S. zokuriense and S. takesimense were not separated from the populations of S. kamtschaticum.
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