| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Asteraceae | Ambrosia acanthicarpa | Annual Bursage | Disturbed areas. | Native of w. North America. | |
| Asteraceae | Ambrosia artemisiifolia | Common Ragweed, Hogweed | Roadsides, gardens, disturbed soils, thin soils on rock outcrops. | NL (Newfoundland), NU, and BC south to FL, TX, CA and southward. |  |
| Asteraceae | Ambrosia bidentata | Lanceleaf Ragweed | Barrens, prairies, mafic woodlands. | S. OH, c. IN, c. IL, and s. IA south to SC (Bradley et al. [in prep.]), nw. GA, n. AL, c. LA and c. TX. Scattered occurrences in other areas probably represent introductions. |  |
| Asteraceae | Ambrosia cheiranthifolia | Rio Grande Ragweed, South Texas Ambrosia | Coastal prairies, in seasonally saturated clays. | S. TX (Cameron, Jim Wells, Kleberg, and Nueces counties) and ne. Mexico (COA, TAM). | |
| Asteraceae | Ambrosia confertiflora | Field Ragweed | Disturbed areas. | Sw. KS, s. CO, s. UT, c. CA, south to s. TX, w. TX, NM, AZ, and widespread in Mexico. Reported for TN (Strother (2006dd). | |
| Asteraceae | Ambrosia hispida | Coastal Ragweed | Beaches, dunes, and less commonly inland in hammocks. | Peninsular FL; West Indies; s. Mexico (ROO, VER, YUC) and Central America. |  |
| Asteraceae | Ambrosia porcheri | Outcrop Ragweed | In shallow soil mats on granitic domes. | Apparently endemic to the Piedmont Blue Ridge escarpment region of nw. SC. |  |
| Asteraceae | Ambrosia psilostachya | Perennial Ragweed | Calcareous prairies and disturbed areas; in loamy sandy soil of flats and slight depressions in periodically burned longleaf pine uplands; also in disturbed areas. | MI west to MT, south to LA and NM; also scattered along eastern seaboard states (ME, NH, NY, NC, SC, GA, FL, VA), where perhaps some of the distribution is adventive. Apparently first collected in VA in 2000. |  |
| Asteraceae | Ambrosia tomentosa | Perennial Bursage, Skeletonleaf Bursage | Disturbed areas; introduced from w. North America. | Native of w. North America. | |
| Asteraceae | Ambrosia trifida var. texana | Texas Giant Ragweed | Floodplains, moist pastures; disturbed ground. | S. IL and MO south to MS, s. TX, and Mexico (CHH, COA, HGO, QRO, SON, TAM, VER). |  |
| Asteraceae | Ambrosia trifida var. trifida | Giant Ragweed | Floodplains, moist pastures, disturbed ground. | NS and BC south to n. peninsular FL, Panhandle FL, TX, and CA. Report from s. FL (Kartesz 2022) is false, based on misidentified specimen. |  |
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