DATA AVAILABILITY STATEMENT
The newly obtained sequences of Cynanchum pingtaoi and C. longhushanense have been submitted to the NCBI website, and the assigned Genbank accessions will be provided soon. The DNA sequences data supporting the findings of this study are available within APPENDIX 1. The morphological data used in the study are included in this paper.
ORCIDGuangda Tang iD https://orcid.org/0000-0001-5623-3928