Tabernanthe iboga is an apocynaceous shrub native to the forests of Gabon and the northern Congo. First described in the late 1800’s, it has been reasonably well studied by botanists. The roots of T. iboga contain several indole alkaloids, of which the most important, ibogaine, is a central stimulant and in large doses an hallucinogen. In Gabon, the roots are used in the initiation rites to.