Handbook of African Medicinal Plants - Maurice M. Iwu - Google Books

https://books.google.de/books?id=LMfMBQAAQBAJ&pg=PA330#v=onepage

With over 50,000 distinct species in sub-Saharan Africa alone, the African continent is endowed with an enormous wealth of plant resources. While more than 25 percent of known species have been used for several centuries in traditional African medicine for…