Taxonomic relationships:
Euonymus duanensis is similar to Euonymus dielsianus but is easily distinguished by its smaller leaves and reddish flowers. Further diagnostic morphological characters of the new species and two related species are presented in Table 1.
Traditionally Euonymus was divided into 5 sections in accordance with fruit characteristics (Cheng and Huang 1999), however, recently phylogenetic study showed that only two sections (sect.Kalonymus and sect. Echinococcus ) were supported as monophyly, and the relationships of other sections remains ambiguous (Li 2014, Li et al. 2014). Our phylogenetic results also confirmed the complex relationship of the genus and found species from different sections mixed (Fig. 4). For example, in morphology the new species,