field image of Hypericum perforatum COMMON ST. JOHN'S WORT at the James Woodworth Prairie Preserve - two lone specimens at full bloom showing stem and leaf detail
Herbarium Blackwellianum emendatum et auctum, id est, Elisabethae Blackwell collectio stirpium.Norimbergae : Typis Io. Iosephi Fleischmanni, 1750-1773..biodiversitylibrary.org/page/291049