| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Apiaceae | Cicuta maculata var. angustifolia | Wetlands. | QC and AK south to AR, LA, TX, NM, AZ, CA, and Mexico. | ||
| Apiaceae | Cicuta maculata var. bolanderi | ||||
| Apiaceae | Cicuta maculata var. maculata | Water-hemlock | Marshes, bogs, seepages, fens, ditches, swamp forests. | NS west to AK, south to FL, CA; Mexico. |  |