Ambrosia cordifolia (A. Gray) W. W. Payne species accepted

Ambrosia acuminata (Brandegee) W. W. Payne species accepted

Ambrosia humi León de la Luz & Rebman species accepted

Ambrosia sandersonii S. L. Welsh species accepted

Ambrosia porcheri P. D. Mc Millan & L. Prevost species accepted

Ambrosia artemisiifolia L. species accepted

Ambrosia nivea (B. L. Rob. & Fernald) W. W. Payne species accepted

Ambrosia acanthicarpa Hook. species accepted

Ambrosia ambrosioides (Cav.) W. W. Payne species accepted

Ambrosia arborescens Mill. species accepted

Ambrosia artemisioides Meyen & Walp. species accepted

Ambrosia bidentata Michx. species accepted

Ambrosia bryantii (Curran) W. W. Payne species accepted

Ambrosia camphorata (Greene) W. W. Payne species accepted

Ambrosia canescens A. Gray species accepted

Ambrosia carduacea (Greene) W. W. Payne species accepted

Ambrosia chamissonis (Less.) Greene species accepted

Ambrosia cheiranthifolia A. Gray species accepted

Ambrosia chenopodiifolia (Benth.) W. W. Payne species accepted

Ambrosia confertiflora DC. species accepted

Ambrosia cumanensis Kunth species accepted

Ambrosia deltoidea (Torr.) W. W. Payne species accepted

Ambrosia dentata (Cabrera) M. O. Dillon species accepted

Ambrosia divaricata (Brandegee) W. W. Payne species accepted

Ambrosia dumosa (A. Gray) W. W. Payne species accepted

Ambrosia eriocentra (A. Gray) W. W. Payne species accepted

Ambrosia flexuosa (A. Gray) W. W. Payne species accepted

Ambrosia grayi (A. Nelson) Shinners species accepted

Ambrosia hispida Pursh species accepted

Ambrosia ilicifolia (A. Gray) W. W. Payne species accepted

Ambrosia johnstoniorum Henrickson species accepted

Ambrosia linearis (Rydb.) W. W. Payne species accepted

Ambrosia magdalenae (Brandegee) W. W. Payne species accepted

Ambrosia maritima L. species accepted

Ambrosia microcephala DC. species accepted

Ambrosia monogyra (Torr. & A. Gray) Strother & B. G. Baldwin species accepted

Ambrosia pannosa W. W. Payne species accepted

Ambrosia polystachya DC. species accepted

Ambrosia psilostachya DC. species accepted

Ambrosia pumila (Nutt.) A. Gray species accepted

Ambrosia salsola (Torr. & A. Gray) Strother & B. G. Baldwin species accepted

Ambrosia scabra Hook. & Arn. species accepted

Ambrosia tenuifolia Spreng. species accepted

Ambrosia tomentosa Nutt. species accepted

Ambrosia trifida L. species accepted

Ambrosia velutina O. E. Schulz species accepted

Ambrosia × helenae Rouleau species accepted

Ambrosia × intergradiens W. H. Wagner species accepted

Ambrosia × platyspina (Seaman) Strother & B. G. Baldwin species accepted