the stalk of a dead cactus, cholla cacti in the ajo mountains, organ pipe cactus national monumenta

about ajo america arborescent arid arizona barrell bear cactus carnegiea chain cholla desert drive dry engelmann engelmannii ferocactus flora fruit fulgida gigantea gigantean hardy hot landscape learn like mammillaria mountain national nature north opunita opuntia organ park pear pincushion pipe plant plants prickly rock saguaro sonoran spine stenocereus succulents teddy the thurberi travel tree usa vegetation weather wild wilderness wislizenii yucca acti