Radermachera sinica, also called china doll, serpent tree or emerald tree, is an evergreen tree in the family Bignoniaceae, native to the subtropical mountain regions of southern China and ******. It can reach heights of up to 30 m tall and a trunk diameter of 1 m. The leaves are bipinnate, 20 to 70 cm long and 15 to 25 cm broad, divided into numerous small glossy green leaflets 2 to 4 cm long. The flowers are white, trumpet-like, about 7 cm long, and resembling a large Bignonia flower in shape.