Ambrosia acuminata (Brandegee) W.W.Payne (original description)
Ambrosia ambrosioides W.W.Payne (original description)
Ambrosia camphorata (Greene) W.W.Payne (original description)
Ambrosia carduacea (Greene) W.W.Payne (original description)
Ambrosia chenopodiifolia (Benth.) W.W.Payne (original description)
Ambrosia cordifolia (A.Gray) W.W.Payne (original description)
Ambrosia deltoidea (Torr.) W.W.Payne (original description)
Ambrosia dumosa (A.Gray) W.W.Payne (original description)
Ambrosia eriocentra (A.Gray) W.W.Payne (original description)
Ambrosia flexuosa (A.Gray) W.W.Payne (original description)
Ambrosia ilicifolia (A.Gray) W.W.Payne (original description)
Ambrosia linearis (Rydb.) W.W.Payne (original description)
Ambrosia magdalenae (Brandegee) W.W.Payne (original description)
Ambrosia nivea (B.L.Rob. & Fernald) W.W.Payne (original description)