Habitat of Euphorbia caput-medusae (Becker & Moller 856, UNIN). Photographer: A. Moller.
Jankalski, S. (2005). Hybrids in succulent Euphorbia. Euphorbia World 1(1), 17-20.
Koutnik, D., and van Jaarsveld, E. (1987). The succulent euphorbias of the Cape Penninsula of South Africa. Euphorbia J. 4, 77-91.