Hemlock Waterparsnip (Sium suave Walter)
Also known as Carson's waterparsnip (S. carsonii only); also classified as Sium carsonii Durand ex A. Gray.
Some authorities, including USDA PLANTS, BONAP, and POWO, treat Sium carsonii Durand ex A. Gray as a separate species. We follow the convention of most other authorities of treating that as an aquatic form of this species (not recognized as a variety or subspecies). NSE gives an explanation and notes "not generally recognized taxonomically, or recognized only at the form level".
↑Range - Expand
| Legend | Color |
| Native | |
| Native or Not Present |
This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.
Although this plant occurs somewhere in each of these regions, it may only occur in a small part of some or all of them.
↑Links & External Resources
• Sium suave (Water Parsnip) | Illinois Wildflowers (About This Site)
• Sium suave (hemlock waterparsnip)† | USDA PLANTS Database (About This Site)
• Sium carsonii (Carson's waterparsnip)† | USDA PLANTS Database (About This Site)
• Sium suave | Go Botany (About This Site)
• Water Parsnip | iNaturalist (About This Site)
• Sium suave (Water Parsnip) | Missouri Botanical Garden Plant Finder (About This Site)
• Sium suave† | Biota of North America Project (BONAP) (About This Site)
• Sium carsonii† | Biota of North America Project (BONAP) (About This Site)
• Sium carsonii† | NatureServe Explorer (About This Site)
• Sium suave† | NatureServe Explorer (About This Site)
• Sium suave | Missouri Plants (About This Site)
• Hemlock Water-parsnip | Maryland Biodiversity Project (About This Site)
• Sium suave (Water Parsnip) | Minnesota Wildflowers (About This Site)
• Sium suave Walt. (Water Parsnip) | Digital Atlas of the Virginia Flora (About This Site)
• Sium carsonii Durand ex A.Gray† | Plants of the World Online (POWO) (About This Site)
• Sium suave Walter | Plants of the World Online (POWO) (About This Site)
Different Taxonomic Treatments
† Each of these links refer only to part of the populations covered by this page.
