organ pipe national park, arizona - cactus in the desert

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