Fig. 3 from: Bruyns, P.V.; Klak, C.; Hanáček, P. (2017) A revised, phylogenetically-based concept of Ceropegia (Apocynaceae). South African Journal of Botany:112 399-436 https://doi.org/10.1016/j.sajb.2017.06.021

Coronal structures similar to those of Ceropegia in Brachystelma and the stapeliads: A–B, Brachystelma blepharanthera, Namibia, Bruyns 5703 (BOL); C–D, B. macropetalum, South Africa, A. Wood; Caralluma arachnoidea, Kenya ex hort. [scale-bars or subdivisions indicate mm; A, corolla from side, C, corolla from front; B, D, E, corona from side].