This plant has the flower and leaves of I. spathulata, a medicinal plant known as Lokitegi and found in eastern and northeastern Africa. In this example from central Tanzania, however, I have no idea what those strange, coiled discs are at the base of the flowers.
Ipomoea squamisepala O'DonellCONVOLVULACEAELago Sul, Braslia, DFRef.: a) Proena, C.C. et al. Flores e Frutos do Cerrado. 2006; b) Medeiros, J.D. Vegetao do Cerrado: 500 Espcies. MMA, 2011.