Hihihi... This is Lantana Camara not Bakung, Bakung is belongs to the Lillies Family. This flower called si reun-reun in Basa Aceh, karamunting in Gayo's, tele' ayam in some part of java. But generally it is called lantana. Now it is a popular one, you can buy it at the ornamental plant's seller.
RE: flower latana