LT:
Plukenet, Phytographia, t. 177, f. 3, 1692 ["Eupatoria conyzoides, folio molli & incano, capitulis magnis, americana"]
LT designated as "type". [ LINN, Pl. Jam. Pug. 22. 1759 cited "Brown. jam. 133" and LINN, Sp. Pl., ed. 2, 2: 1174. 1763 cited "Habitat [in America.]" (jp-2004)
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Lectotype designated by:
King, R. M. & H. E. Robinson. 1975 [1976]. Flora of Panama, Part IX. Family 184. Compositae. II. Eupatorieae. Ann. Missouri Bot. Gard. 62(4): 925.
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