"They rode that night through forests of saguaro up into the hills to the west."
Saguaro (Carnegiea gigantea) forest, Arizona
Creative Commons AttributionSaguaro (Carnegiea gigantea) forest, Arizona - Credit: Alan Vernon

The saguaro is a large, tree-sized cactus. It is native to the Sonoran Desert in the US state of Arizona, the Mexican state of Sonora, a small part of Baja California in the San Felipe Desert and an extremely small area of California, USA.

The common name saguaro came into the English language through the Spanish language, originating in the O'odham language.