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twining screwstem
Scientific Name: Bartonia paniculata
Family: Gentianaceae
Category: Dicot
Growth: Vine, Forb/herb
Duration: Annual, Biennial
Other Names: IL (screwstem), ME (screwstem), MI (panicled screw
Twining Screwstem (Bartonia paniculata)
Bartonia paniculata, commonly known as twining screwstem, is an inconspicuous annual or biennial plant.
Considerations for Pets
- The plant sometimes grows in a twining or scrambling manner.
- It's a vine or forb/herb.
Taxonomy and Nomenclature
- Scientific Name: Bartonia paniculata (Michx.) Muhl.
- Common Names: Twining screwstem, branched bartonia, panicled screwstem
- Family: Gentianaceae
- Rank: Species. Subspecies are also recognized.
- Subspecies:
- Bartonia paniculata ssp. paniculata
- Bartonia paniculata ssp. iodandra (B.L. Rob.)
- Synonyms/Alternative Names:
- Branched bartonia
- Panicled screwstem
- Purplish bartonia (for B. paniculata subsp. iodandra)
- Purplish screwstem (for B. paniculata subsp. iodandra)
Distribution and Habitat
- An obligate wetland species.
- Found in New England and other parts of the US, including Wisconsin, Maryland, Alabama, Arkansas, and Oklahoma.
- Specific locations mentioned include Jackson Co., Wisconsin and Worcester County, Maryland.
Ecological Role
- Twining screwstem is probably a saprophytic mycotroph, meaning it gets most of its nutrients from decaying organic matter with the help of fungi.
Morphological Characteristics
- Growth habit: Vine, Forb/herb
- Plant type: Annual or Biennial
- Flower Color: White
- Shoots are often twisted, even twining.
Further Information
- Endangered Resources Program
- Discover Life
- ResearchGate
- United States Department of Agriculture
- NYNHP Conservation Guide