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Saquaro cactus (Carnegiea gigantea).

The saguaro cactus is one of the defining plants of the Sonoran Desert. These plants are large, tree-like columnar cacti that develop branches (or arms) as they age. It is the largest cactus in the United States. You find this cactus in southern Arizona and western Sonora, Mexico. USDA zone 9-11.

If you want more information about this flower, just search the plant's Latin name on Google:

Saquaro cactus

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