Mahogany and others
Sapele= Entandrophragma cylindricum
African Mahogany= Khaya anthotheca
Tropical American Mahogany (Real Mahogany)= Swietenia macrophylla
Sapele (pronounced sa-peel-ee) is a hardwood which comes from eastern and western Africa, and grows in a range of climates from the Ivory Coast to the Cameroons, and eastward through Zaire to Uganda. Sapele (Entandrophragma cylindricum) is of the family Meliaceae which includes mahagony. Although some may refer to it as sapele-mahogony it is not a member of the genus Swietena and therefore is not considered a true mahogony by purists.
However the one of the very best woods is Kiaat or Mukwa :- http://www.countrywoods.co.za/Kiaat_mukwa.htm
Health hazards and wood :- http://www.ubeaut.com.au/badwood.htm