Bartonia is a genus of the gentian family, tribe Gentianeae, subtribe Swertiinae. Members of this genus are called screwstems. Bartonia was also the name of a genus in the Loasaceae family, but those species are now generally classified under the genus Mentzelia. , Kew's Plants of the World Online accepts three species of Bartonia: Bartonia paniculata Bartonia verna Bartonia virginica References Gentianaceae Gentianaceae genera Taxa named by Gotthilf Heinrich Ernst Muhlenberg