Contains 3 accepted taxa overall.
Characteristics
Classification
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.
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 Endangered-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 |