| 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, NY, and perhaps NJ. |  |
| Gentianaceae | Bartonia paniculata ssp. paniculata | Screwstem Bartonia | Swamps, bogs, pocosins, pocosin ecotones, sphagnous seepages, sinkhole ponds. | Ssp. paniculata ranges from MA south to c. peninsular FL and west to e. TX, chiefly on the Coastal Plain, but with scattered occurrences inland, to c. VA, e. WV (Vanderhorst et al. 2013), w. NC, KY, and AR. |  |
| Gentianaceae | Bartonia paniculata ssp. texana | Texas Screwstem | Baygalls, acid seepages. | Ssp. texana is endemic to the West Gulf Coastal Plain of w. LA and e. TX, where it is more-or-less sympatric with ssp. paniculata (Mathews et al. 2009). |
Cite as...