| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Apiaceae | Cicuta maculata var. angustifolia | Spotted Water-hemlock | Wetlands and riparian areas. | Québec and Alaska south to Arkansas, Louisiana, Texas, New Mexico, Arizona, California, and Mexico. | |
| Apiaceae | Cicuta maculata var. bolanderi | Bolander's Water-hemlock | Salt marshes or other salty habitats, riparian areas, often in shallow standing water. | Widespread in the U.S. and e. Mexico; throughout our area except the northern portion and Florida. | |
| Apiaceae | Cicuta maculata var. maculata | Water-hemlock | Marshes, bogs, seepages, fens, ditches, swamp forests. | Nova Scotia west to Alaska, south to Florida, California; Mexico. |  (c) Mathieu, Loïc - CC-BY |