 | This article needs additional citations for verification. (December 2023) |
| Ageratum | |
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| Ageratum corymbosum | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Eupatorieae |
| Genus: | Ageratum L. 1753 not Mill. 1754 (Plantaginaceae)[1] |
Ageratum (/əˈdʒɛrətəm/)[2] (whiteweed in the US) is a genus of 40[3] to 60 tropical and warm temperate flowering annuals and perennials from the family Asteraceae, tribe Eupatorieae. Most species are native to Central America and Mexico but four are native to the United States.[3]
They form tussocks or small hills. They grow to a height of 30 inches (76 cm).[citation needed] The opposite leaves are cordate or oval, hairy or tomentose. The margins are slightly toothed or serrate. The leaves form compact clusters.[citation needed]
The fluffy flowers are lavender-blue, pink, lilac, or white, and spread in small compound umbels. They give small, dry fruits.
- ^ "Tropicos". www.tropicos.org. Archived from the original on 2023-05-30. Retrieved 2024-01-03.
- ^ Sunset Western Garden Book, 1995:606–607
- ^ a b Nesom, Guy L. (2006). "Ageratum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 21. New York and Oxford: Oxford University Press – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.