Adenium swazicum occurs in Eswatini (formerly Swaziland) and adjacent parts of South Africa. The stems tend to be weak and decumbent, and the caudex (actually swollen roots) tends to be underground. Plants flower in late summer and fall (some clones flower most of the year). The best distinguishing character is the petals of solid color (no fading toward the throat), which is darker in color and lacks nectar guides. In addition, the anther appendages are very short and hidden within the tube.  A. boehmianum is the only other species that shares these floral traits. The 2 species are distinguished by growth form: swazicum is a lax shrub while boehmianum is erect and usually arborescent. White flowers occur in cultivation.