Below the flat petals, the genus Rosa has a deep hypanthium. Inside the hypanthium are many free carpels (apocarpous gynoecium). The many free carpels, each of which has a superior ovary, are enclosed by the hypanthium. The styles protrude through the opening in the top of the hypanthium.
Photo of Rosa carolina, left, taken by K. R. Robertson at Belmont Prairie Nature Preserve, DuPage County, Illinois. Photo of Rosa rubrifolia, right, taken by K. R. Robertson from plants cultivated at the University of Illinois.
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