EUPATORIUM L.
Beentje, H.J. & Ghazanfar, S.A. (eds.) (2005) Compositae (Part 3) Flora of Tropical East Africa
Perennial herbs (in ours). Leaves opposite. Capitula in corymbs, homogamous, discoid. Phyllaries 1-many-seriate. Receptacular scales 0. Corolla 4- or 5-lobed, purplish, bluish or white. Achenes 5-angled. Pappus of numerous bristles in 1-3 series.
Worldwide: c.290 species in the Eastern USA, C and W South America; 2 species naturalised in the Old World.
Zimbabwe: 2 cultivated taxa.