Imbe (Garcinia livingstonei), also called African mangosteen or Livingstone's garcinia, is a small round orange fruit of the same tropical genus as the purple mangosteen. Borne on a slow-growing evergreen tree of East and Southern Africa, each thin-skinned fruit holds one or two large seeds in a scant, bright-tasting pulp that is sweet, tangy and often clingingly resinous.