Euonymus duanensis, is similar to Euonymus dielsianus, however, the two species do not form sister relationships on our phylogenetic tree. On the contrary, Euonymus verrucosus and Euonymus verrucosoides formed a sister relationship first, and subsequently form sister relationship with Euonymus duanensis. So, we employed two related species during the discussion of the new species and its related species in morphological characters to distinguish the new species more clearly (Table 1). Due to the complexity of the relationship between species of Euonymus, much more extensively sampling representativeness and molecular data are needed to further reveal the phylogenetic relationship of the genus in the future.