Definition: Apocynaceae is a group of flowering plants belonging to the family Apocynaceae, which includes several species with aromatic and bitter or sour fruits. These plants are widely distributed in many regions around the world, from Asia to Europe, Africa, and North America. They contain various essential oils, including eucalyptol, linalool, and cineole, that have been used in perfumes, cosmetics, and aromatherapy for centuries.