Saguaro National Park, AZ/Tucson Mountains. Monsoon clouds aglow silhouette saguaro cactus (Carnegiea gigantea) after sunset. 793h3

Saguaro National Park, AZ/Tucson Mountain Unit. Saguaro cactus (Carnegiea gigantea) at dawn with emerging flowers at tip of limb. 594v8

Saguaro National Park, AZ/Tucson Mountains Unit. Saguaro cactus (Carnegiea gigantea) silhouetted by summer monsoon lightning storm. 7886X65Dupe