Eupatorium semiserratum

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Eupatorium semiserratum
Eupa semi.jpg
Photo by Guy Anglin, 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. semiserratum
Binomial name
Eupatorium semiserratum
EUPA SEMI dist.jpg
Natural range of Eupatorium semiserratum from USDA NRCS Plants Database.

Common name: Smallflower thoroughwort

Taxonomic notes

Synonyms: Eupatorium cuneifolium var. semiserratum (A.P. de Candolle) Fernald & Griscom[1]

Varieties: none[1]


A description of Eupatorium semiserratum is provided in The Flora of North America. Unlike other similar species, it often has 3 leaves per node that are whorled.[1]


This species is distributed from southeast Virginia south to northeast Florida and the panhandle, west to Texas and Arkansas, and disjunct in Tennessee.[1]


It has well-documented anticancer activities against various human cancer cell lines.[2]


Generally, E. semiserratum can be found in savannas, swamp forests, seepage bogs, clay-based Carolina bays, and other various wetland habitats.[1] It has been observed in live oak hammocks, between floodplain swamps and powerline corridors, in depressions in flatwoods, longleaf pine-wiregrass savannas, pine flatwoods, scrub oak, banks of rivers, edges of cypress depressions, and in wet drainages on open wooded slopes. It is also found in human disturbed habitats such as roadside ditches and depressions, powerline corridors, and in areas that have been clear cut and plowed.[3]

Associated species include Pinus taeda, P. palutris, P. elliottii, Serenoa repens, Taxodium distichum, Liquidambar styraciflua, Eupatorium pilosum, E. semiserratum, E. recurvans, E. leucolepis, E. cuneifolium, E. mohrii, E. scabridum.[3]


This species generally flowers from late July until October.[1] It has been observed flowering from August to October.[3][4]

Seed dispersal

E. semiserratum is thought to be dispersed by wind.[5]

Conservation, cultivation, and restoration

It is listed as endangered by the Kentucky State Nature Preserves Commission.[6]

Cultural use

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Weakley, A.S. 2020. Flora of the Southeastern United States. Edition of 20 October 2020. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
  2. Kintzios, S. E. (2007). "Terrestrial plant-derived anticancer agents and plant species used in anticancer research." Critical Reviews in Plant Sciences 25: 79-113.
  3. 3.0 3.1 3.2 Florida State University Robert K. Godfrey Herbarium database. URL: Last accessed: June 2014. Collectors: Robert K. Godfrey, Richard D. Houk, Loran C. Anderson, Victoria I. Sullivan, Kurt E. Blum, R. L. Lazor, R. Kral, Gary R. Knight, J. P. Gillespie, John Lazor, Paul L. Redfearn, Jr., S. C. Hood, R. A. Norris, R. F. Doren, and Annie Schmidt. States and Counties: Florida: Calhoun, Escambia, Franklin, Gadsden, Gulf, Holmes, Jackson, Jefferson, Lafayette, Leon, Liberty, Nassau, Okaloosa, Santa Rosa, Walton, and Washington. Georgia: Atkinson, Baker, and Thomas.
  4. Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. Accessed: 10 MAY 2019
  5. Creech, M. N., et al. (2012). "Alteration and Recovery of Slash Pile Burn Sites in the Restoration of a Fire-Maintained Ecosystem." Restoration Ecology 20(4): 505-516.
  6. USDA, NRCS. (2016). The PLANTS Database (, 10 May 2019). National Plant Data Team, Greensboro, NC 27401-4901 USA.