Old Man Cactus
Scientific Name: Cephalocereus senilis (Haw.) Pfeiff.
Synonym: Cactus senilis, Cereus senilis, Pilocereus senilis, Cephalophorus senilis, Cactus bradypus, Echinocactus staplesiae
Family: Cactaceae

Found at Boyce Thompson Arboretum in Superior Arizona