du Plessis M., Johnson S. D., Nicolson S. W., Bruyns P. V., Shuttleworth A., Pollination of the “carrion flowers” of an African stapeliad (Ceropegia mixta: Apocynaceae): the importance of visual and scent traits for the attraction of flies, Plant Systematics and Evolution, 2018, 304(3):357-372, doi: 10.1007/s00606-017-1481-0
The study of Orbea variegata, described as Ceropegia mixta, examines pollinators, scent composition and experiments with the visibility and colour of model flowers. Scent also attracted flies to concealed flowers, while visibility increased visits. The size and presence of dark spots did not change the frequency of visits to the models.