Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cylindropuntia is a genus of cacti (family Cactaceae), containing the chollas. They were formerly treated as a subgenus of Opuntia but have now been separated based on their cylindrical stems and the presence of papery epidermal sheaths on the spines. A few species of mat or clump forming opuntioid cacti are currently placed in the genus Grusonia. There are about 35 species of Cylindropuntia native to the southwest and south central United States, Mexico and the West Indies, The Flora of North America recognizes 22 species. Some species have been introduced to South America (Chile, Ecuador, Peru) and South Africa.

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