| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Rubiaceae | Diodia harperi | Harper's Buttonweed | Pondshores, other moist sites. | E. NC south to s. peninsular FL, west to e. TX and AR. |  |
| Rubiaceae | Diodia virginiana | Large Buttonweed | Ditches, wet fields, wet swales along highways, other moist to wet habitats. | CT, PA, IL, and KS south to FL and TX; West Indies; Mexico (YUC) and Central America. |  |
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