maackia tenuifolia

Ocimum americanum, known as American basil or 'hoary basil', is an annual herb with white or lavender flowers. It is used for medicinal purposes. Despite the misleading name, it is native to Africa, the Indian Subcontinent, China, and Southeast Asia. The species is naturalized in Queensland, Christmas Island, and parts of tropical America.

Ocimum americanum in West African plants – A Photo Guide.