There are over 2,000 species of cacti, but none more iconic than the mighty saguaro. — Pronounced suh-waa-roh, these cacti can stretch over 40 feet tall; the tallest one on record was 78 feet tall! Saguaros are native to the Sonoran Desert, one of the four deserts in North America. The Sonoran Desert stretches from Sonora, Mexico, north into Arizona, and west into southeastern California. And…