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Cactaceae

 7-Opuntia habit

[FMP-field: image]
In Opuntia macrorhiza, the stems are flattened, pad-like structures. This species is low to the ground, seldom more than a foot high; it is found in hill prairies and sand prairies in the western part of Illinois.
Photo by K. R. Robertson at Cap aux Gris hill prairie, Calhoun County, Illinois.
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