Roadless Areas
Home/Species/ Roundleaf Thoroughwort

Eupatorium rotundifolium

L.

Roundleaf Thoroughwort

G5Secure Found in 9 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
LowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.155815
Element CodePDAST3P1P0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusEupatorium
Other Common Names
roundleaf thoroughwort (EN)
Concept Reference
Kartesz, 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 Date2024-05-23
Change Date1986-04-02
Edition Date2024-05-23
Edition AuthorsNordman, C. (2024).
Threat ImpactLow
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Rank Reasons
Roundleaf Thoroughwort (Eupatorium rotundifolium) occurs in the southeastern United States as far west as Missouri, Oklahoma and Texas, extending north into New England. Range extent was estimated to be 2.2 million square kilometers, and there are about 1300 occurrences, including on various National Forests, State Forests, State Parks, and other conservation lands. Residential development and lack of fire are threats.
Range Extent Comments
Roundleaf Thoroughwort (Eupatorium rotundifolium) occurs in the southeastern United States as far west as Missouri, Oklahoma and Texas, extending north into New England. Range extent was estimated to be 2.2 million square kilometers using herbarium specimens and photo-based observations documented between 1993 and 2024 (GBIF 2024, iNaturalist 2024, Weakley and Southeastern Flora Team 2023).
Occurrences Comments
By applying a 1 km separation distance to herbarium records and photo-based observations documented between 1993 and 2024, it is estimated that there are about 1300 occurrences of Roundleaf Thoroughwort (Eupatorium rotundifolium) rangewide (GBIF 2024, iNaturalist 2024).
Threat Impact Comments
Residential development and lack of fire are threats.
Ecology & Habitat

Habitat

Roundleaf Thoroughwort (Eupatorium rotundifolium) occurs in sandy soils of moist to dry woodlands, pine savannas, margins of ponds, seepage bogs, and roadsides at 10-200 meters elevation (Flora of North America Editorial Committee 2006, Weakley and Southeastern Flora Team 2023).
Terrestrial Habitats
Forest EdgeWoodland - ConiferSavanna
Palustrine Habitats
HERBACEOUS WETLANDSCRUB-SHRUB WETLAND
Other Nations (1)
United StatesN5
ProvinceRankNative
IndianaS3Yes
TennesseeSNRYes
OhioSNRYes
South CarolinaSNRYes
KentuckyS5Yes
West VirginiaS5Yes
AlabamaSNRYes
Rhode IslandSNRYes
MarylandSNRYes
MaineSNRYes
DelawareS5Yes
FloridaSNRYes
MississippiSNRYes
ArkansasSNRYes
PennsylvaniaS2Yes
TexasSNRYes
OklahomaS1Yes
VirginiaS5Yes
New YorkSNRYes
New JerseySNRYes
New HampshireSNRYes
North CarolinaS5Yes
LouisianaSNRYes
MassachusettsSNRYes
District of ColumbiaSNRYes
MissouriSNRYes
GeorgiaS5Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
1.1 - Housing & urban areasSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
7 - Natural system modificationsRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
7.1 - Fire & fire suppressionRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
7.1.2 - Suppression in fire frequency/intensityRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (9)
Florida (1)
AreaForestAcres
SavannahApalachicola National Forest1,927
Georgia (2)
AreaForestAcres
Kelly RidgeChattahoochee National Forest8,325
Shoal BranchChattahoochee National Forest413
Louisiana (1)
AreaForestAcres
Cunningham Brake Research Natural AreaKisatchie National Forest1,797
North Carolina (4)
AreaForestAcres
Catfish Lake NorthCroatan National Forest11,299
Linville Gorge AdditionPisgah National Forest2,809
Pond Pine BCroatan National Forest2,961
Sheep Ridge AdditionCroatan National Forest5,808
Texas (1)
AreaForestAcres
Little Lake CreekNational Forests in Texas596
References (5)
  1. Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
  2. Global Biodiversity Information Facility (GBIF). 2024. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2024).
  3. iNaturalist. 2024. Online. Available: https://www.inaturalist.org (accessed 2024).
  4. Kartesz, 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.
  5. Weakley, A.S., and Southeastern Flora Team. 2023. Flora of the southeastern United States. Edition of April 14, 2023. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2105 pp.