| Bartonia paniculata | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Gentianales |
| Family: | Gentianaceae |
| Genus: | Bartonia |
| Species: | B. paniculata |
| Binomial name | |
| Bartonia paniculata (Michx.) Muhl. | |
| Subspecies [2] | |
| |
Bartonia paniculata, commonly known as twining screwstem, is a saprophytic, annual or biennial species that grows in acidic, sandy-peaty wetlands. [1]
Bartonia paniculata is the northernmost-ranging species in the genus Bartonia . [3] It is found along the Atlantic coastal plain; its widespread range crosses 29 American states and five Canadian provinces, and overlaps with that of Bartonia virginica . [3] [4] The subspecies texana is found in eastern Texas and northeastern Louisiana; it was previously identified as Bartonia texana. [2]
Twining screwstem is legally protected in the state of Michigan as a threatened species. [5]
Populations of the subspecies texana have declined by 50% over the past 57 years. [6] It is found within the baygalls of the coastal plain forests of southeastern Texas. As the baygalls have become rarer as a plant community, the texana subpopulation has also declined. [6]
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