This scene contains all three columnar cacti that occur in the United States. Senita (Lophocereus schottii) is on the left, organ pipe cactus (Stenocereus thurberi) in the middle, and saguaro (Carnegiea gigantea) on the right. Senita Basin, Organ Pipe Cactus National Monument, Arizona.

Retrieved from the Arizona-Sonora Desert Museum web site on 11-25-2024
http://digitallibrary.desertmuseum.org/desert/habitats_AZUOP15.php