Herbarium Blackwellianum emendatum et auctum, id est, Elisabethae Blackwell collectio stirpium.Norimbergae : Typis Io. Iosephi Fleischmanni, 1750-1773..biodiversitylibrary.org/page/291029
close up image of Lepidium virginicum COMMON PEPPERCRESS at the James Woodworth Prairie Preserve - a single bloom head showing buds, flowers, and seed pods