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Image: McDowell Sonoran Preserve
Sunset at McDowell Sonoran Preserve in Scottsdale, Ariz.Elizabeth Belts Kauffman

Answer: The saguaro is the state flower of Arizona, blooming white flowers in late spring. The largest cactus in the U.S., saguaros are found exclusively in the Sonoran Desert and can grow up to 60 feet tall and and live up to 200 years. They are protected and listed as an endangered species.