Bougainvillea, (genus Bougainvillea), genus of about 18 species of shrubs, vines, or small trees, belonging to the four-o’clock family (Nyctaginaceae), native to South America. Many species are thorny. Indian Coral Tree is a showy, spreading tree legume with brilliant red or white blossoms. This highly valued ornamental has been described as one of the gems of the floral world.The umbrella plant is a multi-trunk tree that can grow over 15 meters tall outdoors and has to be pruned and topped at some point to keep its size manageable within a home.