Some types of cactus seem to have a propensity to genetic variations technically called fascination. There is a very nice collection of cactus at the Carefree Desert Gardens, north of Scottsdale, Arizona. This type of variation is rare in some species but more common in saguaro cactus. The process is seen in a huge variety of plant species, but seems to be more noticeable in cactus because of the variations in the stems of the plants. I run across fascinated saguaro cactus from time to time, but didn't realize how many other types were affected.
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