The saguaro, with its great size and characteristic shape, has become the emblem of the Sonoran Desert of southwestern Arizona and northwestern Mexico. The Saguaro Cactus offers a complete natural history of this enduring cactus, the largest and tallest in the United States. From its role in Sonoran Desert ecology, to its adaptations to the desert climate, to its sacred place in Indigenous culture, this book offers a definitive source on a distinguished desert plant.