Boechera pulchra

Boechera pulchra, the beautiful rockcress, is a perennial plant in the mustard family (Brassicaceae) found in the Mojave Desert and other dry regions of southern and eastern California and Nevada, and the Colorado Plateau and Canyonlands region of the southwestern United States, mostly below elevation.
Description.
A long-lived perennial, it is usually tall from a woody base. Eight to twenty purple, rarely white, flowers are borne in a normally unbranched raceme. Petals are long and wide. Sepals are hairy.