Psorothamnus arborescens var. simplicifolius

California Indigo Bush is a deciduous bush that grows in desert washes in the north western portion of the Colorado Desert from the desert floor up to about 1460 meters(4800 ft,). You'll almost always find it associated with a wash, much like Desert Willow. It even looks like desert willow, until it flowers.
This little bushg grows to maybe 2 meters (six feet) high and wide. AKA, Dalea fremontii var. simplifolia, Dalea californica, Parosela californcia var. simplifolia, Psorodendron californicum, etc.