Pachycereus is a genus of 9 to 12 species of large cacti native to Mexico and just into southern Arizona, USA. They form large shrubs or small trees up to 50 feet (15) m or more tall, with stout stems up to 3.3 feet (1 m) in diameter. Pachycereus comes from the ancient Greek "pakhus", meaning "thick" and the Latin "cereus", meaning "torch".

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