Muira puama, also called "potency wood," is a small tree that grows to 5 m high and is native to the Brazilian Amazon and other parts of the Amazon rainforest. The small, white flowers have a pungent fragrance similar to jasmine's. The Ptychopetalum genus is a small one - only two species of small trees grow in tropical South America and five in tropical Africa. The two South American varieties, P. olacoides (found in Brazil, French Guiana, Guyana, and Suriname) and P. uncinatum (found only in Brazil), are used interchangeably in South American herbal medicine systems. The olacoides variety is usually preferred, as it has a higher content of lupeol (one of the plant's active phytochemicals). A completely different species of Brazilian tree, Liriosma ovata, also goes by the common name of muira puama (and is often sold in commerce as such); however, it is a completely different tree with a different phytochemical makeup.
Sources: Muira Puama - Food: Herbs & Spices - at Life Enthusiast, http://www.life-enthusiast.com/muira-puama-a-5225.html (accessed January 24, 2017).