| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Fabaceae | Acmispon americanus | Western Prairie-trefoil | Prairies, glades, bluff-tops, roadsides; eastwards a waif, as near wool waste-combing mills, other disturbed areas. | MB and SK south to w. LA and c. TX; also BC south to s. CA, AZ, NM, and Mexico. |  |
| Fabaceae | Acmispon helleri | Carolina Prairie-trefoil | Dry woodlands and openings, originally probably limited to prairie-like sites (fire-maintained, post oak-blackjack oak savannas), generally on clayey soils, now primarily seen on roadbanks, along railroads, and in powerline rights-of-way, where mowing and bush-hogging have replaced fire as the force keeping the habitat open, sunny, and suitable for this plant of prairie affinities. | A. helleri is endemic to the Piedmont of extreme sc. VA, NC, SC, and ne. GA. |  |