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Cylindropuntia
''Cylindropuntia'' is a genus of cacti (family Cactaceae), containing the cholla, native to northern Mexico and the Southwestern United States. They are known for their barbed spines that tenaciously attach to skin, fur, and clothing.
Stands of cholla are called cholla gardens. Individuals within these colonies often exhibit the same DNA as they were formerly tubercles of an original plant.
==Classification==
''Cylindropuntia'' was formerly treated as a subgenus of ''Opuntia'', but have now been separated based on their cylindrical stems (''Opuntia'' species have flattened stems) and the presence of papery epidermal sheaths on the spines (''Opuntia'' has no sheaths).〔Pinkava, D. J. 1999. Cactaceae cactus family: Part 3. Cylindropuntia… J. Arizona-Nevada Acad. Sci. 32: 32-47.〕 A few species of mat- or clump-forming opuntioid cacti are currently placed in the genus ''Grusonia''.
The roughly 35 species of ''Cylindropuntia'' are native to the southwest and southcentral 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.〔Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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