Fang, K.-Y., Tong, Y.-H., Vu, T.-C., Nguyen, K.-S. & Xia, N.-H. (2022)

Argostemma tortilobum (Rubiaceae), a new species from Vietnam

. Phytotaxa 567 (1): 105–109. https://doi.org/10.11646/phytotaxa.567.1.11