Handroanthus albus

Handroanthus albus, the golden trumpet tree, is a tree with yellow flowers native to Argentina, Paraguay, Bolivia and the Cerrado of Brazil, where it is known as ipê-amarelo-da-serra.
This plant is found in the Brazilian states of Federal [District (Brazil) | Distrito Federal], where it's the states symbol, Bahia, Espírito Santo, Goiás, Mato [Grosso do Sul], Minas Gerais, Paraná, Rio de Janeiro, Rio Grande do Sul, Santa Catarina, Piauí, Amazonas, Pará and São Paulo.
It is used as an urban tree. Well-known and popular, the tree and its flower are the national plants of Brazil.