elliptic, lanceolate, oblanceolate
July - October
0.3 - 1.8
Similar to E. serotinum but has a petiole that is less than 2 mm long or absent and its leaf blade margins are toothed only on the upper half while E. semiserratum has a petiole that is more than 2 mm long and its leaf blades are toothed below the middle. Also similar to Ageratina altissima which occurs on similar sites but has shorter petioles (E. serotinum has petioles up to 1 inch long). Opposite leaves, 5 teeth on each side of leaf. Deep purple stem, non-woody.
The seeds of several Eupatoriums are eaten by birds.
Found frequently in sandy soils throughout Louisiana, east and southeast Texas (south to Aransas County). Occurs throughout the Southeastern United States. The species in this genus had many medicinal uses by early pioneers. Their leaves were used as a poultice under splints to heal broken bones, which explains the origin of its common name, "boneset."
Savannas, pine barrens, bogs, swamp forests, low woods, and clearings.