Medicinal source:

Schmelzer, G.H. & Gurib-Fakim, A. (eds.) (2008). Plant Resources of Tropical Africa (PROTA) 11 (1): Medicinal plants 1. Backhuys Publishers, CTA PROTRA, Wageningen. [MPNS is grateful to Uwe Schippmann (MAPROW) for providing the data from this reference.]