cholla cactus, ocotillo plants and saguaro cactus grow together along ajo mountain drive in arizona in organ pipe national

ajo america arid arizona biosphere blue botanical cacti cactus cholla desert diablo drive dry green grow growth hot landscape landscapes monument mountain mountains national nature north ocotillo organ park pipe plant plants prickly reserve saguaro sagurao sand scenic sky sonoran southern southwest spring states succulent thorn together travel tree unesco united usa vegetation west western wilderness