| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Asteraceae | Ambrosia trifida var. trifida | Giant Ragweed, Herbe du sang (frc) | Floodplains, moist pastures, disturbed ground. | Nova Scotia and British Columbia south to n. peninsular Florida, Panhandle Florida, Texas, and California. Report from s. Florida (Kartesz 2022) is false, based on misidentified specimen. |  (c) Sorrie, Bruce A. - CC-BY |
| Asteraceae | Ambrosia trifida var. texana | Texas Giant Ragweed | Floodplains, moist pastures; disturbed ground. | S. Illinois and Missouri south to Mississippi, s. Texas, and Mexico (Chihuahua, Coahuila, Hidalgo, Querétaro, Sonora, Tamaulipas, Veracruz). |  (c) Campos, Aidan |