Roundleaf Thoroughwort (Eupatorium rotundifolium L.)
Some authorities, including USDA PLANTS and BONAP, lump inland roundleaf eupatorium (Eupatorium pubescens) in with this species, as var. ovatum, and roughleaf eupatorium (Eupatorium scabridum) similarly as var. scabridum. USDA PLANTS also lumps clasping roundleaf eupatorium (Eupatorium cordigerum) in here as var. cordigerum, whereas BONAP treats that separately. We separate all three per the treatment of POWO and FSUS.
↑Habitat
This species is somewhat of a generalist, found in a variety of disturbed, partly-shaded habitats, including open bottomland woods, bluffs along streams, savannas, and margins of swamps and bogs. Also found in anthropogenic habitats including roadsides, especially roadside ditches, powerline clearances, pastures, abandoned fields, and firebreaks.
Found in a range of moisture conditions from wet to dry. Most likely on sites that experience regular fire or other disturbance.
↑Links & External Resources
• Eupatorium rotundifolium L. var. rotundifolium (roundleaf thoroughwort) | USDA PLANTS Database (About This Site)
• Eupatorium rotundifolium | Go Botany (About This Site)
• Eupatorium rotundifolium var. rotundifolium | Biota of North America Project (BONAP) (About This Site)
• Eupatorium rotundifolium | NatureServe Explorer (About This Site)
• Eupatorium rotundifolium | Flora of North America (About This Site)
• Round-leaved Thoroughwort | Maryland Biodiversity Project (About This Site)
• Round-leaved Thoroughwort (ovatum) | Maryland Biodiversity Project (About This Site)
• Round-leaved Thoroughwort (rotundifolium) | Maryland Biodiversity Project (About This Site)
• Eupatorium rotundifolium L. (Roundleaf Thoroughwort, Roundleaf Boneset) | Digital Atlas of the Virginia Flora (About This Site)
• Eupatorium rotundifolium L. | Plants of the World Online (POWO) (About This Site)
