What family are both Adenium and Oxypetalum a part of?
Adenium: Adenium is a genus of flowering plants in the Apocynum family, Apocynaceae, first described as a genus in 1819. Oxypetalum: Oxypetalum is a genus of flowering plants in the Apocynaceae family, first described with this name in 1810.
Apocynum family,