| Silphium asperrimum Hook. |
Accepted |
7 |
| Silphium asteriscus L. |
Accepted |
7 |
| Silphium asteriscus var. dentatum (Elliott) Chapm. |
Accepted |
7 |
| Silphium asteriscus var. simpsonii (Greene) J. A. Clevinger |
Accepted |
7 |
| Silphium asteriscus var. trifoliatum (L.) J. A. Clevinger |
Accepted |
7 |
| Silphium brachiatum Gatt. |
Accepted |
7 |
| Silphium compositum Michx. |
Accepted |
7 |
| Silphium glutinosum J. R. Allison |
Accepted |
7 |
| Silphium integrifolium Michx. |
Accepted |
7 |
| Silphium integrifolium var. integrifolium |
Accepted |
7 |
| Silphium integrifolium var. laeve Torr. & A. Gray |
Accepted |
7 |
| Silphium laciniatum L. |
Accepted |
7 |
| Silphium perfoliatum L. |
Accepted |
7 |
| Silphium perfoliatum var. connatum (L.) Cronquist |
Accepted |
7 |
| Silphium radula Nutt. |
Accepted |
7 |
| Silphium radula var. gracile (A. Gray) J. A. Clevinger |
Accepted |
7 |
| Silphium terebinthinaceum Jacq. |
Accepted |
7 |
| Silphium terebinthinaceum var. pinnatifidum (Elliott) A. Gray |
Accepted |
7 |
| Silphium trifoliatum L. |
Accepted |
7 |
| Silphium laciniatum Walter |
Unresolved |
7 |
| Silphium reniforme Raf. |
Unresolved |
7 |
| Silphium asteriscus var. asteriscus |
Synonym of Silphium asteriscus L. |
7 |
| Silphium gatesii C. Mohr |
Synonym of Silphium asteriscus L. |
7 |
| Silphium laevigatum Pursh |
Synonym of Silphium asteriscus L. |
7 |
| Silphium dentatum Elliott |
Synonym of Silphium asteriscus var. dentatum (Elliott) Chapm. |
7 |
| Silphium simpsonii Greene |
Synonym of Silphium asteriscus var. simpsonii (Greene) J. A. Clevinger |
7 |
| Silphium ovatifolium (Torr. & A. Gray) Small |
Synonym of Silphium compositum Michx. |
7 |
| Silphium integrifolium var. deamii L. M. Perry |
Synonym of Silphium integrifolium var. integrifolium |
7 |
| Silphium integrifolium var. neglectum Settle & T. R. Fisher |
Synonym of Silphium integrifolium var. integrifolium |
7 |
| Silphium integrifolium var. laeve |
Synonym of Silphium integrifolium var. laeve Torr. & A. Gray |
7 |
| Silphium speciosum Nutt. |
Synonym of Silphium integrifolium var. laeve Torr. & A. Gray |
7 |
| Silphium laciniatum None |
Synonym of Silphium laciniatum L. |
7 |
| Silphium perfoliatum var. perfoliatum |
Synonym of Silphium perfoliatum L. |
7 |
| Silphium connatum L. |
Synonym of Silphium perfoliatum var. connatum (L.) Cronquist |
7 |
| Silphium radula var. radula |
Synonym of Silphium radula Nutt. |
7 |
| Silphium reverchonii Bush |
Synonym of Silphium radula Nutt. |
7 |
| Silphium simpsonii var. wrightii L. M. Perry |
Synonym of Silphium radula Nutt. |
7 |
| Silphium gracile A. Gray |
Synonym of Silphium radula var. gracile (A. Gray) J. A. Clevinger |
7 |
| Silphium terebinthinaceum var. terebinthinaceum |
Synonym of Silphium terebinthinaceum Jacq. |
7 |
| Silphium pinnatifidum Elliott |
Synonym of Silphium terebinthinaceum var. pinnatifidum (Elliott) A. Gray |
7 |