Eupatorium mohrii

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Eupatorium mohrii
Eupa mohr.jpg
Photo by Dennis Girard, Atlas of Florida Vascular Plants
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida – Dicotyledons
Order: Asterales
Family: Asteraceae ⁄ Compositae
Genus: Eupatorium
Species: E. mohrii
Binomial name
Eupatorium mohrii
EUPA MOHR dist.jpg
Natural range of Eupatorium mohrii from USDA NRCS Plants Database.

Common name: Mohr's thoroughwort

Taxonomic notes

Synonym: Eupatorium recurvans Small


A description of Eupatorium mohrii is provided in The Flora of North America.




It does well in open canopy areas on longleaf pine habitats. Does not do well in highly disturbed areas (such as clear cutting).[1] It is found areas that have become wet in some parts of the year such as in slash pine flatwoods, hammocks, near creeks, pond-pine scrubs, peaty pine savannas, wet flatwwods, swampy depressions between sand ridges, pine-palmetto flatwoods, upper edges of hilldside bogs, edges of titi bogs, swales and dunes, and in river floodplains. It is also found in human disturbed areas such as pinelands that have been clear cut, along roadside depressions, embankments, edges of an artificial pond, and in powerline corridors. It is associated with areas that have moist soil, moist sandy peaty soil, semi-wet soil, muckly aulluvium soils, and moist sandy clay.[2]

Associated species include Eupatorium rotundifolium, E. album, E. cuneifolium, E. leucolepis, E. recurvans, E. mikaniodes, Andropogon, Aster dumosus, Ludwigia virgata, Carex joorii, Panicum rigidulum, Rhexia mariana, Rubus cuneifolius, Magnolia virginina, Pinus palutris, P. elliottii, P. taeda, Serenoa repens, Aristida stricta, Quercus, Liquidambar styraciflua, Cyrilla racemiflora.[2]


Native, perennial herb in longleaf pine stands.[3] E. mohrii has been observed flowering from June to November.[4][2]


The following Hymenoptera families and species were observed visiting flowers of Eupatorium mohrii at Archbold Biological Station: [5]

Apidae: Apis mellifera, Bombus impatiens

Halictidae: Agapostemon splendens, Halictus poeyi

Leucospididae: Leucospis robertsoni, L. slossonae

Megachilidae: Coelioxys mexicana, Dianthidium floridiense, Megachile albitarsis

Sphecidae: Bicyrtes capnoptera, B. insidiatrix, Cerceris blakei, Philanthus ventilabris, Prionyx thomae, Tachytes pepticus, T. validus

Vespidae: Pachodynerus erynnis

Conservation and management

Cultivation and restoration

Photo Gallery

References and notes

  1. Brockway, D. G. and C. E. Lewis (2003). "Influence of deer, cattle grazing and timber harvest on plant species diversity in a longleaf pine bluestem ecosystem." Forest Ecology and Management 175: 49-69.
  2. 2.0 2.1 2.2 Florida State University Robert K. Godfrey Herbarium database. URL: Last accessed: June 2014. Collectors: R.K. Godfrey, Loran C. Anderson, A. F. Clewell, Clarke Hudson, R.L. Lazor, J. P. Gillespie, D. S. Correll, P. L. Redfearn, Jr., Sid McDaniel, J. Lazor, Jean W. Wooten, V. I. Sullivan, J. Britten, B. K. Holst, Cruz, Montero, C. Jackson, R. Kral, Roomie Wilson, B F Hansen, JoAnn Hansen, Carol Havlik, Ann F. Johnson, Chet Winegarner, Marsha Winegarner, S. C. Hood, R. A. Norris, R. Komarek, and Annie Schmidt. States and Counties:Florida: Bay, Brevard, Citrus, Clay, Columbia, Dixie, Flagler, Franklin, Gulf, Hamilton, Holmes, Jefferson, Leon, Levy, Liberty, Martin, Okaloosa, Putnam, Santa Rosa, Sarasota, St. John’s, Suwannee, Taylor, Union, Wakulla, Walton, and Washington. Georgia: Atkinson, Brantley, Camden, Charlton, Clinch, Decatur, Echols, Grady, Thomas, and Ware.
  3. Harrington, T. B. (2011). "Overstory and understory relationships in longleaf pine plantations 14 years after thinning and woody control." Canadian Journal of Forest Research 41: 2301-2314.
  4. Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. Accessed: 9 DEC 2016
  5. Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.