| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Gentianaceae | Bartonia paniculata ssp. iodandra | Purple Screwstem | Wet, peaty hollows, sphagnous bogs, peaty turf, and damp lake shores in sandy soil. | Newfoundland south to Long Island, New York, and perhaps New Jersey. |  (c) Semmling, Bonnie - CC-BY |
| Gentianaceae | Bartonia paniculata ssp. paniculata | Screwstem Bartonia | Swamps, bogs, pocosins, pocosin ecotones, sphagnous seepages, sinkhole ponds. | Ssp. paniculata ranges from Massachusetts south to c. peninsular Florida and west to e. Texas, chiefly on the Coastal Plain, but with scattered occurrences inland, to c. Virginia, e. West Virginia (Vanderhorst et al. 2013), w. North Carolina, Kentucky, and Arkansas. |  (c) Danielson, Erik |
| Gentianaceae | Bartonia paniculata ssp. texana | Texas Screwstem | Baygalls, acid seepages. | Ssp. texana is endemic to the West Gulf Coastal Plain of w. Louisiana and e. Texas, where it is more-or-less sympatric with ssp. paniculata (Mathews et al. 2009). |  |
| Gentianaceae | Bartonia verna | Spring Bartonia, White Bartonia | Wet pine savannas, shores of Coastal Plain depression ponds, interdune swales, other moist sands. | Virginia (one site known from City of Virginia Beach) (Belden et al. 2004) and se. North Carolina (Carteret County) south to s. Florida, west to se. Texas. |  (c) Cressler, Alan M. |
| Gentianaceae | Bartonia virginica | Virginia Bartonia, Yellow Bartonia | Bogs, swamps, pine savannas, pocosin ecotones, pocosins, dune swales. | Nova Scotia and Québec west to Wisconsin, south to s. Florida, Louisiana, and e. Texas (Singhurst & Bridges 2024). |  (c) Cressler, Alan M. |