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Genus: Ageratum

Life > eukaryotes > Archaeoplastida > Chloroplastida > Charophyta > Streptophytina > Plantae (land plants) > Tracheophyta (vascular plants) > Euphyllophyta > Lignophyta (woody plants) > Spermatophyta (seed plants) > Angiospermae (flowering plants) > Eudicotyledons > Core Eudicots > Asterids > Euasterid II > Asterales > Family: Asteraceae > Tribe: Eupatorieae

The 44 species are all native to Central and South America and West Indies. Two species naturalised in southern Africa.

Species naturalised in southern Africa

List from Plants of southern Africa - an online checklist (SANBI) and Flora of Zimbabwe.

Ageratum conyzoides (Invading ageratum)

A Category 1 weed in South Africa. See Flora of Zimbabwe.


Ageratum houstonianum (Blue Weed, Mexican ageratum)

A Category 1 weed in South Africa (excluding cultivars). See Flora of Zimbabwe.


  • Johnson, M.F. 1971. A monograph of the genus Ageratum L. (Compositae - Eupatorieae). Annals of the Missouri Botanical Garden 58: 6-88.


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