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CCDB → Angiosperms → Apiaceae → Ptilimnium
| Taxon name | Status | Median (n) |
| Ptilimnium capillaceum (Michx.) Raf. | Accepted | 7 |
| Ptilimnium costatum Raf. | Accepted | 16 |
| Ptilimnium fluviatile (Rose) Mathias | Accepted | 6 |
| Ptilimnium nodosum (Rose) Mathias | Accepted | 6 |
| Ptilimnium nuttallii (DC.) Britton | Accepted | 7 |
| Ptilimnium capillaceum None | Synonym of Ptilimnium capillaceum (Michx.) Raf. | 7 |
| Ptilimnium capillaceum None | Synonym of Ptilimnium capillaceum (Michx.) Raf. | 7 |
| Ptilimnium fluviatile None | Synonym of Ptilimnium fluviatile (Rose) Mathias | 6 |