Bougainvillea is a genus of flowering plants.it is often grown as gardening plant in warm climate. Bougainvilleas first came from South America. They are climbing plants grown for decoration in tropical countries, and in the southern United States.it is Grenada's national flower. Farther north, the plants are grown in greenhouses. The bougainvillea is named for the French navigator Louis-Autoine de Bougainville.