Molecular phylogenetics
The results of phylogenetic systematic analysis show that the new species is a member of Cynanchum , according to the combined two nuclear DNA regions (nr ITS and nr ETS) and three plastid DNA markers (one spacers of trn L-F, and two introns ofrps 16 and trn L). And it is the sister to C. pulchellum and C. longhushanense with the strong support rate (BSML= 100%, Figure 1).