Dimorphocarpa wislizeni (syn. Dithyrea wislizeni) growing primarily with the equally sand-loving Artemisia filifolia (at right).This mustard is a southwestern USA desert species occurring principally in southern Utah, Arizona and New Mexico, extending to southwestern Colorado and southeastern Nevada, and barely reaching into Texas and Mexico.This is a particularly robust example.May 3, 1985, Coral Pink Sand Dunes State Park, Kane County, Utah, elev. approx. 5,935 ft.Scanned from a Kodachrome slide.