Hypericum crux-andreae, commonly called St. Peter's-wort, is a species of flowering plant in the Hypericaceae (St. John's wort) family. It is a small shrub native to Eastern North America. It is primarily found in the sandy soils of the Coastal Plain with extensions into the Piedmont and Cumberland Plateau. It is found in wet flatwoods, and generally in wet, open, sandy areas such as bogs or seeps, although it is occasionally found in drier habitats.