Publication: Sp. Pl. 2: 988. 1753.
Origin: Introduced from eastern North America
selected vouchers: WTU
Notes: FNA21: "Hybrids between Ambrosia psilostachya and A. artemisiifolia have been called A. ×intergradiens W. H. Wagner."
FNA21: "The name Ambrosia ×helenae Rouleau applies to hybrids between A. artemisiifolia and A. trifida."