This cultivated tree is native to SW of the United States and NW Mexico. I found it in El Chorro, Málaga province. It grows to an height of 12 metres tall and is drought tolerant. The trunk and leaves take on a blue~green colour, but the leaves do not appear until after rainfall. The flowers are bright yellow and pea like, which are followed by flat seed pods.
It rarely survives beyond 100 years of age.