These beautiful, tiny cacti are considered "hedgehogs." This species often thrives in steep, rocky habitats. Box Canyon, AZ.
The cholla is extremely sinister, even among cacti. It reproduces by catching the needle-sharp, barbed spines of it's 4-inch detachment in the skin of an unfortunate animal, eventually falling off after days of agonizing pain for the recipient. The beautiful flowers it produces may be even more of a paradox than the thorns on roses. Saguaro NP West, AZ.
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