This picture was taken on March 27th in the McDowell Mountain Regional Park, Fountain Hills Arizona. Elevation about 2000 to 2400 feet. I know the yellow flowers are Fiddlenecks but I need help with the ID for the white flower. Any ideas?
Probably, Rafinesquia neomexicana: http://www.azhikinggallery.com/showimage.asp?galleryid=spurcrossranch_042107&imageid=45