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CCDB → Angiosperms → Apiaceae → Sium
| Taxon name | Status | Median (n) |
| Sium floridanum Small | Accepted | 6 |
| Sium latifolium L. | Accepted | 10 |
| Sium latijugum C. B. Clarke | Accepted | 6 |
| Sium medium Fisch. & C. A. Mey. | Accepted | 6 |
| Sium ninsi Thunb. | Accepted | 9 |
| Sium sisarum L. | Accepted | 11 |
| Sium suave Walter | Accepted | 6 |
| Sium erectum Huds. | Synonym of Berula erecta (Huds.) Coville | 9 |
| Sium lancifolium M. Bieb. | Synonym of Sium sisarum L. | 11 |
| Sium sisaroideum DC. | Synonym of Sium sisarum L. | 11 |