What plant containing single-seeded, blue-black drupes is part of the Manilkara zapota family? 
Sideroxylon celastrinum: Sideroxylon celastrinum is a species of flowering plant in the sapodilla family, Sapotaceae, that is native to Texas and Florida in the United States south through Central America to northern Venezuela and Colombia in South America. Manilkara zapota: Manilkara zapota, commonly known as the sapodilla ( ), is a long-lived, evergreen tree native to southern Mexico, Central America and the Caribbean.
i don't know