Contains 3 accepted taxa overall.
Characteristics
Classification
Citation
AGERATINA Spach, Hist. Nat. Vég. 10: 286. 1841.
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TYPE: Ageratina aromatica (Linnaeus) Spach (Eupatorium aromaticum Linnaeus) Lectotypified by R. M. King & H. Robinson, Sida 3: 330. 1969.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ageratina altissima | WHITE SNAKEROOT | Native FACU (NWPL) | ||
| Ageratina aromatica | LESSER SNAKEROOT | Native | ||
| Ageratina jucunda | HAMMOCK SNAKEROOT | Native FACU (NWPL) |
Identification Key
1. Petioles (5)10-30(50) mm long; leaf blade 2.5-8(9) cm wide, chartaceous; phyllaries 3-7 mm long; roots mostly 0.3-0.8 mm thick
1. Petiole 1-15(22) mm long; leaf blade 1.5-4 cm wide, relatively subcoriaceous; phyllaries 2-4.5 mm long; roots mostly 0.8-2 mm thick
2
2. Petioles 1-12 mm long; leaf blades mostly 5-8 times longer than the subtending petiole, the blade margins usually shallowly crenate to subentire; corolla lobes usually densely long-pubescent; achenes usually glabrate
2. Petioles 7-22 mm long; leaf blades mostly 1-4 times longer than the subtending petiole, the blade margins usually strongly toothed; corolla lobes usually sparsely short-pubescent to glabrate; achenes usually pubescent, at least apically
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Batschia | Batschia Moench, Methodus 567. 1794, non Batscha Cothenius 1790, nec Batschia J. F. Gmelin 1791. | TYPE: Batschia nivea Moench, nom. illegit. (Ageratum altissimum Linnaeus) | |
| Kyrstenia | Kyrstenia Necker ex Greene, Leafl. Bot. Observ. Crit. 1: 8. 1903. | TYPE: Kyrstenia aromatica (Linnaeus) Greene (Eupatorium aromaticum Linnaeus) Lectotypified by R. M. King & H. Robinson, Sida 3: 336. 1969. = Ageratina Spach 1841, by lectotypification. | |
| Mallinoa | Mallinoa J. M. Coulter, Bot. Gaz. 20: 47. 1895. | TYPE: Mallinoa corymbosa J. M. Coulter |