''Bartonia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

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 Kew () is a district in the London Borough of Richmond upon Thames. Its population at the 2011 census was 11,436. Kew is the location of the Royal Botanic Gardens ("Kew Gardens"), now a World Heritage Site, which includes Kew Palace. Kew is a ...

Plants of the World Online Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...

accepts three species of ''Bartonia'': *''

Bartonia paniculata ''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 ...

'' *''

Bartonia verna ''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 ...

'' *''

Bartonia virginica ''Bartonia virginica'' is species of flowering plant in Gentianaceae. It is the commonly called yellow screwstem or yellow bartonia and it is an annual species with small pale green to yellow flowers. Description ''Bartonia virginica'' is an ann ...

References

Gentianaceae Gentianaceae genera Taxa named by Gotthilf Heinrich Ernst Muhlenberg {{Gentianales-stub