| 33946 | Silphium integrifolium Michx. | | | a | | Silphium integrifolium Michx. | |
| 33947 | Silphium laciniatum L. | | | a | | Silphium laciniatum L. | |
| 33948 | Silphium perfoliatum L. | | | a | | Silphium perfoliatum L. | |
| 33949 | Silphium trifoliatum L. | | | a | | Silphium trifoliatum L. | |
| 33950 | Silphium trilobatum L. | Sphagneticola trilobata (L.) Pruski | 409995 | | | Silphium trilobatum L. | Sphagneticola trilobata (L.) Pruski |
| 405619 | Silphium spp. | | | a | | Silphium spp. | |
| 418965 | Silphium peristenium Raf. | Engelmannia peristenia (Raf.) Goodman & C. A. Lawson | 418964 | | | Silphium peristenium Raf. | Engelmannia peristenia (Raf.) Goodman & C. A. Lawson |
| 449883 | Silphium terebinthinaceum Jacq. | | | a | | Silphium terebinthinaceum Jacq. | |
| 449884 | Silphium compositum Michx. | | | a | | Silphium compositum Michx. | |
| 458984 | Silphium pumilum Michx. | Berlandiera pumila (Michx.) Nutt. | 458983 | | | Silphium pumilum Michx. | Berlandiera pumila (Michx.) Nutt. |
| 458985 | Silphium betonicifolia Hook. | Berlandiera ×betonicifolia (Hook.) Small | 413042 | | | Silphium betonicifolia Hook. | Berlandiera betonicifolia (Hook.) Small |
| 463822 | Silphium albiflorum A. Gray | | | a | | Silphium albiflorum A. Gray | |
| 465619 | Silphium radula Nutt. | | | a | | Silphium radula Nutt. | |
| 465620 | Silphium radula Nutt. var. radula | | | a | i | Silphium radula Nutt. var.radula | |
| 465621 | Silphium radula Nutt. var. gracile (A. Gray) Clevinger | | | a | i | Silphium radula Nutt. var.gracile (A. Gray) Clevinger | |
| 486332 | Silphium wasiotense Medley | | | a | | Silphium wasiotense Medley | |