Identity
Unique IDELEMENT_GLOBAL.2.158217
Element CodePDCON040G0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderSolanales
FamilyConvolvulaceae
GenusCalystegia
SynonymsConvolvulus spithamaeusL.
Other Common NamesLiseron dressé (FR) low false bindweed (EN)
Concept ReferenceKartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic CommentsThis record is for the broad treatment of Calystegia spithamaea, including ssp. purshiana and ssp. stans, as recognized by Brummitt in FNA (2002, vol. 23) and Kartesz (1994, 1999). Weakley et al. (2024) recognize these taxa in the genus Convolvulus and include ssp. purshiana and ssp. stans in the distinct species Convolvulus purshianus, making their treatment of Convolvulus spithamaeus more narrow.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-07-03
Change Date2024-07-03
Edition Date2024-07-03
Edition AuthorsN. Ventrella (2024)
Threat ImpactUnknown
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Rank ReasonsCalystegia spithamaea is a perennial herb found in a variety of habitats; including sandy and stony sites, alluvial gravel, clay-loam, and glacial till in shale barrens, dry birch or coniferous woodlands, and grasslands of eastern North America from Ontario to Quebec, Canada south to Maine west to Minnesota, south to Missouri and east to Tennessee and North Carolina in the United States. Threats include development, recreation, right of way maintenance, invasive species, and succession. With a large range extent, more than 500 occurrences, abundant habitat, broad habitat preferences, and no obvious intrinsic vulnerabilities, this species is considered secure.
Range Extent CommentsCalystegia spithamaea occurs in eastern North America from Ontario to Quebec, Canada south to Maine west to Minnesota, south to Missouri and east to Tennessee and North Carolina in the United States (FNA 2023). It is presumed extirpated in Manitoba, Canada. Range extent was estimated to be over 2 million square kilometers using herbarium specimens, NatureServe network data, and photo-based observations documented between 1993 and 2024 (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024). See individual entries for distribution details about the three subspecies.
Occurrences CommentsBy applying a 1 km separation distance to herbarium specimens, NatureServe network occurrence data, and photo-based observations documented between 1993 and 2024, it is estimated that there are over 500 occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024).
Threat Impact CommentsAlthough threats are not widely documented, Calystegia spithamaea is potentially threatened by development, recreation, right of way maintenance, invasive species, succession, and other threats in some places, though there is insufficient data, including anecdotal accounts, to understand the scope and severity of threats for this species.