| Author | Title | Journal/publisher | Literature ref. no. |
| Beentje, H. (2021) | Apocynaceae, sous-familes I. Apocynoideae et II. Rauvolfioideae | Flore d' Afrique Centrale Jardin botanique de Meise | 1279 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.