gardenia, (genus Gardenia), genus of more than 140 species of shrubs and trees in the madder family (Rubiaceae), native to tropical and subtropical Africa, Asia, and Pacific islands. Cape jasmine (Gardenia jasminoides), native to China, is the fragrant species sold by florists and grown as an ornamental.
Gardenias have glossy evergreen leaves that usually are arranged oppositely or in whorls. The tubular flowers are white or yellow and are borne singly or in small clusters; the flowers are often strongly scented. The large berrylike fruits contain a sticky orange pulp.