''Bartonia'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

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 Loasaceae is a family of 15–20 genera and about 200–260 species of flowering plants in the order Cornales, native to the Americas and Africa. Members of the family include annual, biennial and perennial herbaceous plants, and a few shrubs ...

family, but those species are now generally classified under the genus ''

Mentzelia ''Mentzelia'' is a genus of about 100 species of flowering plants in the family (biology), family Loasaceae, native to the Americas. The genus comprises annual plant, annual, biennial plant, biennial, and perennial plant, perennial herbaceous pl ...

''. ,

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 ...

Plants of the World Online Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

accepts three species of ''Bartonia'': *'' Bartonia paniculata'' *'' Bartonia verna'' *'' Bartonia virginica''

References

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