L.
Identity
Unique IDELEMENT_GLOBAL.2.145257
Element CodePDAST3P1T0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusEupatorium
Other Common Namesupland boneset (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.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-06-13
Change Date1984-04-24
Edition Date2024-06-13
Edition AuthorsOlivero, A., rev. N. 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 ReasonsEupatorium sessilifolium is widespread and common throughout much of the eastern United States, only becoming rare along the northern edge of its range. It is estimated that there are over 400 occurrences rangewide. It occurs in open dry edges of mesic woods where threats include woody plant encroachment and shading of open habitats due to the absence of fire, invasive species, browse by deer, and development. However, these threats are considered negligible given the species' broad range, preference for disturbance, and large number of occurrences.
Range Extent CommentsEupatorium sessilifolium occurs in the eastern United States from Minnesota to Maine south to Georgia and west to Kansas (FNA 2006). Range extent was estimated to be 1.9 million square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1993 and 2024 (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024). See individual entries for distribution details about the two varieties.
Occurrences CommentsBy applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1993 and 2024, it is estimated that there are over 400 occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024).
Threat Impact CommentsThreats to Eupatorium sessilifolium are not well documented, but include woody plant encroachment and closure of canopy gaps due to the absence of fire, invasive species, browse by deer, and development (NatureServe 2024). However, their overall impact is likely negligible given the species' broad range, large number of occurrences, preference for disturbance, and affinity for typically abundant habitats, as well as no obvious intrinsic vulnerabilities.