• Ambrosia Linnaeus, 1753
• Ambrosia acanthicarpa Hook.
• Ambrosia ambrosioides (Cav.) Payne
• Ambrosia aptera DC. accepted as Ambrosia trifida Linnaeus
• Ambrosia artemisiifolia Linnaeus
• Ambrosia bidentata Michx.
• Ambrosia californica Rydb. accepted as Ambrosia psilostachya DC.
• Ambrosia canescens (Benth.) Gray
• Ambrosia chamissonis (Less.) Greene
• Ambrosia cheiranthifolia Gray
• Ambrosia chenopodiifolia (Benth.) Payne
• Ambrosia confertiflora DC.
• Ambrosia cordifolia (Gray) Payne
• Ambrosia coronopifolia Torr. & Gray accepted as Ambrosia psilostachya DC.
• Ambrosia cumanensis auct. non Kunth accepted as Ambrosia psilostachya DC.
• Ambrosia deltoidea (Torr.) Payne
• Ambrosia dumosa (Gray) Payne
• Ambrosia elatior Linnaeus accepted as Ambrosia artemisiifolia Linnaeus
• Ambrosia eriocentra (Gray) Payne
• Ambrosia glandulosa Scheele accepted as Ambrosia artemisiifolia Linnaeus
• Ambrosia grayi (A. Nels.) Shinners
• Ambrosia helenae Rouleau
• Ambrosia hispida Pursh
• Ambrosia ilicifolia (Gray) Payne
• Ambrosia intergradiens Wagner
• Ambrosia linearis (Rydb.) Payne
• Ambrosia maritima Linnaeus
• Ambrosia monophylla (Walt.) Rydb. accepted as Ambrosia artemisiifolia Linnaeus
• Ambrosia paniculata Michx. accepted as Ambrosia artemisiifolia Linnaeus
• Ambrosia peruviana Willd.
• Ambrosia psilostachya DC.
• Ambrosia pumila (Nutt.) Gray
• Ambrosia rugelii Rydb. accepted as Ambrosia psilostachya DC.
• Ambrosia sandersonii Welsh accepted as Hymenoclea sandersonii (Welsh) N. Holmgren
• Ambrosia tenuifolia Spreng.
• Ambrosia tomentosa Nutt.
• Ambrosia trifida Linnaeus
• Ambrosiaemyces Trotter, 1934
• Ambrosiaemyces zeylanicus Trotter, 1934