| Creeping St. Johnswort | Hypericum | adpressum | | 9 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Tutsan | Hypericum | androsaemum | | 1 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Northern St. Johnswort | Hypericum | boreale | | 1 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Lesser Canadian St. Johnswort | Hypericum | canadense | | 76 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| St. Peterswort | Hypericum | crux-andreae | | 45 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Bushy St. Johnswort | Hypericum | densiflorum | | 22 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Coppery St. Johnswort | Hypericum | denticulatum var. denticulatum | | 13 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Drummond's St. Johnswort | Hypericum | drummondii | | 1 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Pale St. Johnswort | Hypericum | ellipticum | | 3 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Fraser's St. Johnswort | Hypericum | fraseri | | 2 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Orangegrass | Hypericum | gentianoides | | 130 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Clasping-leaved St. Johnswort | Hypericum | gymnanthum | | 15 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| St. Andrew's Cross | Hypericum | hypericoides | | 208 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Dwarf St. Johnswort | Hypericum | mutilum | | 167 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Common St. Johnswort | Hypericum | perforatum | | 260 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Shrubby St. Johnswort | Hypericum | prolificum | | 33 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Spotted St. Johnswort | Hypericum | punctatum | | 176 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Low St. Johnswort | Hypericum | stragulum | | 25 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Sharp-leaved St. Johnswort | Hypericum | virgatum | | 2 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Virginia Marsh St. Johnswort | Hypericum | virginicum | | 82 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |
| Greater Marsh St. Johnswort | Hypericum | walteri | | 22 | St. Johnswort Family | Hypericaceae | Theales | Magnoliopsida | Plantae |