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Bartonia paniculata ssp. iodandra

Bartonia paniculata (Michx.) Muhl. ssp. iodandra (B.L. Rob.) J.M. Gillett

Twining Screwstem

Gentianaceae (Gentian Family)

Synonym(s): Bartonia iodandra, Bartonia paniculata var. intermedia, Bartonia paniculata var. iodandra, Bartonia paniculata var. sabulonensis, Bartonia virginica var. sabulonensis

USDA Symbol: BAPAI

USDA Native Status: L48 (N), CAN (N), SPM (N)

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Plant Characteristics

Duration: Annual
Habit: Vine
Leaf Complexity: Simple
Leaf Shape: Lanceolate , Oblong
Leaf Margin: Entire
Fruit Type: Capsule
Size Notes: Up to about 10 inches tall.

Bloom Information

Bloom Color: White , Yellow , Green , Purple
Bloom Time: Jun , Jul , Aug , Sep , Oct , Nov
Bloom Notes: White or occasionally pale yellow to green, often purple-tinged distally.

Distribution

USA: CT , MA , ME , RI
Canada: NB , NL , NS , ON

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 34 - Go Botany (2019) Native Plant Trust
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Bartonia paniculata ssp. iodandra in USDA Plants
FNA: Find Bartonia paniculata ssp. iodandra in the Flora of North America (if available)
Google: Search Google for Bartonia paniculata ssp. iodandra

Metadata

Record Modified: 2026-03-20
Research By: TWC Staff

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