Syn. Pl. Succ. 37 (1812)
[Synopsis plantarum succulentarum]
- Bruyns, P.V., Monograph of Orbea and Ballyanthus (Apocynaceae-Asclepiadoideae-Ceropegieae), Systematic Botany Monographs vol. 63: 1-196 (2002)
Synonymous genera:
- Angolluma Munster (1990)
- Diplocyatha N.E. Br. (1878)
- Stapeliopsis Pillans (1928)
- Stultitia E. Phillps (1933)