Bartonia paniculata

Bartonia paniculata
Secure
Secure (NatureServe)
Scientific classification Edit this 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
  • B. paniculata subsp. iodandra
  • B. paniculata subsp. paniculata
  • B. paniculata subsp. texana

Bartonia paniculata, commonly known as twining screwstem, is a saprophytic, annual or biennial species that grows in acidic, sandy-peaty wetlands.

Distribution

Bartonia paniculata is the northernmost-ranging species in the genus Bartonia. 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. The subspecies texana is found in eastern Texas and northeastern Louisiana; it was previously identified as Bartonia texana.

Conservation

Twining screwstem is legally protected in the state of Michigan as a threatened species.

Populations of the subspecies texana have declined by 50% over the past 57 years. 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.

References

  1. 1 2 "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2025-01-08.
  2. 1 2 "Bartonia paniculata (Michx.) Muhl. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2025-01-08.
  3. 1 2 Mathews, Katherine G.; Dunne, Niall; York, Emily; Struwe, Lena (2009-03-01). "A Phylogenetic Analysis and Taxonomic Revision of Bartonia (Gentianaceae: Gentianeae), Based on Molecular and Morphological Evidence". Systematic Botany. 34 (1): 162–172. doi:10.1600/036364409787602320. ISSN 0363-6445.
  4. ↑ Hill, Steven (28 January 2003). "Conservation assessment for twining screwstem (Bartonia paniculata (Michx.) Muhl.)". Center for Biodiversity Technical Report 2003. 7.
  5. ↑ "Bartonia paniculata (Panicled screwstem) - Michigan Natural Features Inventory". mnfi.anr.msu.edu. Retrieved 2025-01-08.
  6. 1 2 Chahal, Sharandeep S. (December 2023). Ecology of rare North American plant species Bartonia paniculata subsp. texana and Platanthera cooperi (Thesis). Texas Tech University. Retrieved 8 January 2025.