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The gastropod genus Bartonia is nowadays usually regarded as a junior synonym of Pseudoneptunea.

White screwstem (Bartonia verna) (6603422259).jpg
Bartonia verna
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Gentianales
Family: Gentianaceae
Tribe: Gentianeae
Subtribe: Swertiinae
Genus: Bartonia
Muhl. ex Willd.

Bartonia paniculata
Bartonia texana
Bartonia verna
Bartonia virginica

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 all of those "Bartonia" species are now generally classified under the genus Mentzelia.