Sonoran Desert - Organ Pipe Cactus Ntml Mmnt

A hillside of organ pipe cacti and a lone saguaro in the Puerto Blanco Mts, Organ Pipe Cactus National Monument, Arizona. Organ pipe cactus is a tropical species that extends into the Sonoran Desert. It is more abundant in thornscrub and tropical deciduous forest. See the gallery on coastal thornscrub for an impenetrable organ pipe forest.