Calystegia spithamaea (L.) Pursh

Photo: Upright Bindweed

Upright Bindweed

Habitat: Sandy or rocky open soil, thin woods. [Dry barrens (partly forested, upland); Old field/roadside (non-forested, wetland or upland)]

Range: Quebec and Maine to Minnesota, south to Virginia and Missouri, and in the mountains of Georgia.

Aids to Identification: The stem of this perennial bindweed is weakly erect, with alternately arranged oblong leaves on short leaf-stalks. The large white or pink flowers are funnel shaped, on long flower stalks.

Photo: Upright Bindweed

Ecological characteristics: In Maine this species is known to occur in sandplain grasslands and sandy floodplains. It sometimes occurs in hayfields and on roadsides, but is not closely related to the non-native and agressive common bindweed (C. sepium).

Phenology: Flowers June - August.

Family: Convolvulaceae

Synonyms: Represented in Maine and New England by Calystegia spithamaea ssp. spithamaea. Synonyms include Convolvulus spithameus L.

Known Distribution in Maine: This rare plant has been documented from a total of 13 town(s) in the following county(ies): Androscoggin, Cumberland, Franklin, Lincoln, Oxford, York.

Reason(s) for rarity: At northern limit of range.

Conservation considerations: Some known populations have succumbed to conversion of their habitat to residential or commercial use; others are vulnerable.

For more information, see the Native Plant Trust's Conservation Plan for Calystegia spithamaea.