.
| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
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| Euphorbiaceae | Euphorbia marginata | Snow-on-the-mountain | Upland sites (prairies, woodlands) over calcareous substrates; eastwards on roadsides and in disturbed areas. | MN and MT south through the Great Plains to MO, TX, NM, and Mexico (CAM, COA, OAX, SLP, SIN, TAB, TAM, VER). | 
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| Euphorbiaceae | Euphorbia albomarginata | White-margin Sandmat, Rattlesnakeweed | Usually in poorly-drained clay soils or prairies, roadsides, and fields. | OK, se. CO, s. UT, NV, and CA south to TX, NM, AZ, and c. Mexico. | 
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