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 Taiwan . 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.
