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Brassica rapa subsp. rapa
Family: Brassicaceae
Brassica rapa subsp. rapa image
From Flora of Indiana (1940) by Charles C. Deam
This weed has been reported twice for the state and I have specimens from two counties. Almost all crucifers are of a weedy nature. Peattie says it is established in the Calumet Region and I found it to be plentiful in the old Fair Grounds at Lawrenceburg, Dearborn County.