| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Rubiaceae | Spermacoce glabra | Smooth Buttonweed | Moist shores, bottomlands, riverside drawdowns, rocky riversides in the mountains, disturbed areas in the Coastal Plain. | C. Maryland, s. Ohio, c. Indiana, c. Illinois, Missouri, and e. Kansas south to s. South Carolina, Panhandle Florida, s. Alabama, s. Mississippi, Louisiana, and e. Texas. Perhaps only introduced in some parts of our area; see Wieboldt et al. (1998) for discussion. |  (c) Marcum, Paul |
| Rubiaceae | Spermacoce keyensis | Florida Buttonweed | Pinelands. | S. Florida; West Indies. Falsely rported for s. Texas (Correll & Johnston 1970); based on a misidentification of Borreria remota. |  (c) Hammer, Roger L. |
| Rubiaceae | Spermacoce ocymoides | Wet pine flatwoods, floodplain forests. | Florida, Alabama, Mississippi, south through the New World tropics. |  (c) Bradley, Keith | |
| Rubiaceae | Spermacoce remota | Woodland Buttonweed | Wet hammocks, bottomland forests, marshes. | Sw. Georgia, s. Alabama, and Florida; Central America, South America, and the West Indies. |  (c) Bradley, Keith |
| Rubiaceae | Spermacoce tenuior | In clay soils along creeks. | S. Texas south through Mexico and Central America to South America. Reported from sw. Georgia and Mississippi (Kartesz 1999, 2010) {IDs need checking; seems a bit unlikely}. |  (c) Díaz, José Belem Hernández - CC-BY | |
| Rubiaceae | Spermacoce tetraquetra | Pineland Buttonweed | Pinelands, hammocks, disturbed areas. | S. Florida; West Indies; s. Mexico and Central America. |  (c) Wrens, Sequoia Janirella - CC-BY-NC, permission granted to NCBG |