Common St. John’s Wort (Hypericum perforatum). Hypericaceae. July 22, 2020 1500 × 1200 Common St. John’s Wort (Hypericum perforatum). Hypericaceae. Non-native. Disturbed habitats. Napeague, July 2020. Non-native. Disturbed habitats. Napeague, Long Island. July, 2020.