| Author | Walter | |
| Distribution | Southern Coastal Plain, Sandhills, and lowermost southeastern Piedmont.
Coastal Plain, southeastern VA to FL and eastern TX, north in the Mississippi Embayment to KY, AR, and OK. | |
| Abundance | Common to locally abundant in most of the southwestern half of the Coastal Plain (including the Sandhills), but rare to uncommon in the eastern counties, and rare in the edge of the Piedmont. | |
| Habitat | Xeric to mesic, disturbed, Longleaf Pine savannas and flatwoods, sandhills, Loblolly Pine-oak-hickory woodlands, sandy fields, pastures, roadsides, powelines. Well adapted to disturbances, including fire. The species favors sandier soils than does the very similar Dog-fennel (E. capillifolium). | |
| Phenology | Flowering and fruiting September-October. | |
| Identification | This and E. capillifolium are our tallest eupatoriums (to 6.5 feet), with many strongly ascending branches bearing abundant tiny florets. Leaves of Yankeeweed are abundant and may be opposite or alternate, dissected into linear segments. Dog-fennel differs in its threadlike leaf segments less than 1 mm wide (vs. 1-2.5 mm wide in Yankeeweed). Both may occur near each other in the Coastal Plain, with Yankeeweed typically in the sandier places. | |
| Taxonomic Comments | None
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| Other Common Name(s) | Coastal Plain Dog-fennel, Coastal Dog-fennel. Yankeeweed is a very odd and misleading name for a Southern species, but it is, by far, the most often used common name. | |
| State Rank | S5 | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | FAC link |
| USACE-emp | FAC link |
