Caesalpinia pulcherrima is a species of flowering plant in the pea family, Fabaceae, that is native to the tropics and subtropics of the Americas. It could be native to the West Indies, but its exact origin is unknown due to widespread cultivation. Common names for this species include Poinciana, Peacock Flower.
Red Bird of Paradise is the national flower of the Caribbean island of Barbados, and is depicted on the Queen's personal Barbadian flag. Source