| Silphium integrifolium | Prairie Rosinweed | Asteraceae | This species contains the following infraspecific taxa: Silphium integrifolium var. integrifolium. Silphium integrifolium var. laeve Torr. & A.Gray. | 3 | 1 |
| Silphium laciniatum | Compass Plant, Robinson's compassplant | Asteraceae | | 2 | 2 |
| Silphium laeve | | Asteraceae | | 1 | 0 |
| Silphium perfoliatum | Cup Plant, Rosinweed | Asteraceae | | 0 | 2 |
| Silphium terebinthinaceum | Prairie Dockm, Prairie rosinweed, Lucy Braun's rosinweed | Asteraceae | | 0 | 2 |
| Silphium trifoliatum | Whorled rosinweed | Compositae | No synonyms are recorded for this name. | 0 | 0 |
| Sphagneticola trilobata | Singapore daisy | Compositae | Complaya trilobata (L.) Strother. Silphium trilobatum L. Thelechitonia trilobata (L.) H.Rob. & Cuatrec. Wedelia carnosa Rich. Wedelia paludosa DC. Wedelia trilobata (L.) Hitchc. | 0 | 2 |