BOTANICAL NAME - Agathosma Betulina, ORIGIN - South Africa, SOURCE - Leaves The buchu plant, also known as round leaf buchu or bookoo, has leaves that are used to make buchu essential oil (Agathosma betulina). The buchu plant is indigenous to South Africa and has a long history of use by local peoples for a variety of therapeutic uses. Buchu essential oil has aromatic constituents that give it a distinct and distinctive perfume. Buchu leaves are used to make buchu oil.