| Author | Title | Journal/publisher | Literature ref. no. |
| Bruyns, P.V. (2002) | Monograph of Orbea and Ballyanthus (Apocynaceae-Asclepiadoideae-Ceropegieae) | Systematic Botany Monographs 63 1-196 | 540 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.
| Species found: 9 |
| Australluma ubomboensis |
| Orbea carnosa subsp. keithii |
| Orbea caudata subsp. caudata |
| Orbea halipedicola |
| Orbea longidens |
| Orbea melanantha |
| Orbea paradoxa |
| Orbea rogersii |
| Orbea umbracula |