red flowers of woolly old man of the mountain cactus (oreocereus celsianus) in an arid garden

red flowers woolly old man mountain cactus oreocereus celsianus arid garden cactaceae south america fluffy white sunlight celsianus scarlet crimson green yellow cleistocactus strausii tupizensis blurred background landscape botanical botany mountain andes argentina autumn bloom blooming blossom bolivia branch bright cactaceae cacti cactus cleistocactus drought resistant flora flower garden hairy oreocereus petal pistil plant red sharp silver spike spine spring springtime stem succulent summer touch