Cereus giganteus, Cactus family (Cactaceae)
Flowers: The Arizona State Flower -- Puffy, shiny white petals around a pale gold center, to 3" wide, typically bloom at night and last only 1 day.
Cactus: Tree-like structure with branches to 20" in diameter, rounded at top. Ribs expand when more moisture is present, and shrink in "accordion-like" pleats during dry times.
Height: Reputed to grow as tall as 50'.
Photographed June 1, in Superstition Mountain area.
Typically found on rocky slopes, only in the Sonoran desert.