Korea is relatively small in size but the flora is very rich in species composition and has very close floristic relationships with China and Japan. According to the most recent comprehensive floristic work, 3 914 taxa of vascular plants which comprise 189 families and 1 044 genera are known to be distributed in Korea. Among them, 407 taxa which belongs to 339 species 46 varieties and 22 forms are generally recognized as endemic to Korea. In addition, six genera including Abeliophyllum (Oleaceae), Echinosophora (Fabaceae), Hanabusaya (Campanulaceae), Homopterix (Apiaceae), Megaleranthis (Ranunculaceae), and Pentactina (Rosaceae) are strictly confined to Korean peninsula. The naturalized plants in Korea comprises 181 taxa belonging to 33 families, 176 species, 3 varieties and 2 forms. Eleutherococcus is an Asian endemic genus with about 35 species worldwide mainly distributed in Eastern North Asia. In Korea, six species and one variety have been known to distribute, however, through this study, Korean Eleutherococcus can be rearranged into 4 species and two varieties which includes E. gracilistylus, E. divaricatus var. divaricatus, E. divaricatus var. chiisanensis, E. sessiliflorus, and E. senticosus.
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