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v.2 - The Cactaceae : descriptions and illustrations of plants of the cactus family / by N.L. Britton and J.N. Rose. - Biodiversity Heritage Library

The pure white waxy blossom of the giant saguaro cactus was designated the state flower of Arizona in Saguaro cactus (Cereus giganteus) is indigenous to Arizona and grows to a height of forty to fifty feet and lives to an age of 150 to 200 years.