sunlight falling on mountain forest valley with blue sky

arid arizona barrell cactaceae cactoideae cactus cane cholla carnegiea gigantea caryophyllales cereus giganteus chain fruit chainlink cylindropuntia imbricata desert succulents dry echinocereeae engelmann 039 prickly pear eudicots flora hardy hot landscape learn about the park nature north america opuntia fulgida organ pipe pilocereus plant rock saguaro national sonoran spine tree treelike usa vegetation walking stick wild wilderness nacti