|Photo by Marty Horowitz 3/7/2013|
Desert Orangetip (Anthocharis cethura) on one of the many Cryptantha species that we'll call Popcorn Flowers.
For butterfly and moth info, try Butterflies and Moths of North America. Use the search box in the upper left.
For flowers of Southeastern Arizona, my favorite resource is Southeastern Arizona Wildflowers and Plants of the Sonoran Desert (aka firefly forest).