Contains 3 accepted taxa overall.

Characteristics
Ageratum L.
WHITEWEED
Classification
ASTERALES
Ageratum
Citation
AGERATUM Linnaeus, Sp. Pl. 839. 1753.
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TYPE: Ageratum conyzoides Linnaeus Lectotypified by Britton & P. Wilson, Bot. Porto Rico 6: 286. 1925.
Distribution Map Present

This species have been reported in the counties highlighted.

Species
Scientific Name Common Name Herbarium Specimens Status Photos
Ageratum conyzoides TROPICAL WHITEWEED Not Native FACU (NWPL)
Ageratum houstonianum BLUEMINK Not Native FACU (NWPL)
Ageratum maritimum CAPE SABLE WHITEWEED Native Rare-State
Identification Key
1.  Roots woody, only slightly fibrous; plant glabrate to moderately pilose, eglandular; flowering Jul-Jan, rarely Apr
1.  Roots strongly fibrous, generally lacking thickened woody roots; plant glandular-punctate or stipitate-glandular
2
2.  Leaf blade underside yellow glandular-punctate (rarely eglandular); peduncles eglandular; phyllaries sparsely pilose to glabrous, eglandular, abruptly tapered at the tip, acuminate; flowering Jan-Oct
2.  Leaf blades eglandular; peduncles usually stipitate-glandular; phyllaries densely pilose (rarely glabrous), stipitate-glandular (rarely glabrous), gradually tapered in the upper half to the tip, acute; flowering Oct-Apr
Genus Synonyms
Synonym Full Citation Basionym Type
Carelia Carelia Fabricius, Enum. 85. 1759. TYPE: = Ageratum Linnaeus 1753.
Coelestina Coelestina Cassini, Bull. Sci. Soc. Philom. Paris 1817: 10. 1817, non Hill 1761. TYPE: Ageratum corymbosum Zuccagni Lectotypified by M. F. Johnson, Ann. Missouri Bot. Gard. 58: 35. 1971.
Isocarpha Isocarpha Lessing, Linnaea 5: 141. 1830, non R. Brown 1817. TYPE: Isocarpha echioides Lessing