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. | 
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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. | 
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