Psorothamnus arborescens is a species of flowering plant in the legume family known by the common name Mojave indigo bush.
Psorothamnus arborescens is native to southwestern North America, where it can be found in many types of desert and dry mountainous habitats. It grows at 100–1,900 metres (330–6,230 ft) in elevation.It is found in the Californian Mojave Desert and Colorado Desert, south into the Sonoran Desert in the Mexican state of Sonora, east past the Sierra Nevada into the Nevada Great Basin ...