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Cactaceae

17-Opuntia

[FMP-field: image]

The genus Opuntia is the largest cactus genus of the family Cactaceae, with different species occurring from Canada southward almost to the tip of South America. The genus is subdivided into several groups. Chollas have cylindrical joints, while those with flat joints or pads are called prickly pear cacti. This image is of one of the latter, Opuntia humifusa, the common prickly pear of eastern North America.

Taken by K. R. Robertson in LaSalle County, Illinois.

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