saguaro cactus carnegiea gigantea stands out against an evening sky, arizona, united states

saguaro cactus carnegiea gigantea stands out against an evening sky arizona united states america autumn beautiful blue cacti cloud country desert dusk family cactaceae flora landscape national park natural nature north october pima county plant salt cedar scene scenery setting sun silhouette sonoran southwestern summer sunlight sunny sunrise sunset tamarisk tamarix thicket tourism travel tucson twilight typical usa view