This member of the Apocynaceae family was described by Hans Schinz in 1888. It is found in the western part of southern Africa, from Namibia into Angola, growing in a well drained soil with some water and lots of sun. The caudex disappears with age. The plant can grow up to two metres or more. The genera is n amed after the Yemen city of Aden.
The species name after G. R. Böhmer, a German botanist. The subspecies; swazicum is the former Adenium swazicum Otto Stapf 1907, now described by Gordon Douglas Rowley in 1974. It is found in the eastern southern Africa: Eastern Swaziland, South Africa and Mozambique. It has a bigger caudex; up to one meter in diameter. Those I found had not really a caudex, but it might have been young plants - all of them. They were found with several hundred meters apart in several populations.

