saguaro, organ pipe and ocotillo cactuses at sunset in organ pipe cactus national monument, arizona, usa

ajo america arid arizona attraction bear cacti cactus carnegiea chain cholla desert dry ecosystem flora fruit gigantea green hedgehog landmark landscape monument mountain national nature ocotillo organ organpipecactus palo park parkinsonia pipe plant saguaro senita sky sonora sonoran southwest stenocereus sunrise sunset teddy thurberi tucson usa vegetation verde west wilderness