| Author | Title | Journal/publisher | Literature ref. no. |
| Bridson, D.M. & Verdcourt, B. (2003) | Rubiaceae, Part 3 | Flora Zambesiaca 5(3) | 190 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.
| Species found: 4 |
| Gardenia imperialis subsp. imperialis |
| Hymenodictyon floribundum |
| Mussaenda arcuata |
| Virectaria major subsp. major |