This is a complex group of plants that involves many recent taxonomic changes. We frequently have to make decisions among the various taxonomic schemes that have been proposed. For Hoodias, in particular, we tend to use an older classification scheme.
Bruyns, P.V., 2005, Stapeliads of southern Africa and Madagascar: Umdaus Press, Hatfield, South Africa.
Dyer, R.A., 1983, Ceropegia, Brachystelma and Riocreuxia in southern Africa: A.A. Balkema, Rotterdam.
Pilbeam, J., 2010, Stapeliads: The British Cactus & Succulent Society, Hornchurch, UK.
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