Planodes virginicum (L.) Greene
Family: Brassicaceae
Virginia Winged Rockcress
Images
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From Flora of Indiana (1940) by Charles C. Deam

Locally frequent to common in fallow cornfields in the southern part of the state. It is usually in moist soil associated with Poa Chapmaniana and Myosotis virginica, indicating a slightly acid habitat which, I think, controls its distribution.