Psorodendron is a genus of flowering plants in the family Fabaceae. It includes five species native to the southwestern United States and northwestern Mexico.Psorodendron arborescens (Torr. ex A.Gray) Rydb. – Mojave indigo bush Psorodendron fremontii (Torr. ex A.Gray) Rydb. – Fremont's indigo bush Psorodendron kingii (S.Watson) Rydb. – Lahontan indigo bush, King's dalea Psorodendron schottii (Torr.) Rydb. – Schott's dalea Psorodendron spinosum (A.Gray) Rydb. – smoketree, smokethorn