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Family: Asteraceae
  Genus: Ambrosia

    Ambrosia artemisiifolia L.*+

        annual bur-sage, common ragweed, short ragweed
             Ambrosia artemisiifolia L. var. elatior (L.) Descourt.
             Ambrosia artemisiifolia L. f. villosa Fernald & Griscom var. elatior (L.) Descourt.
             Ambrosia elatior L.
             Ambrosia media Rydb.
    Ambrosia psilostachya DC.*+

        perennial ragweed, western ragweed
             Ambrosia californica Rydb.
             Ambrosia coronopifolia Torr. & A.Gray
             Ambrosia coronopifolia Torr. & A.Gray var. asperula A.Gray
             Ambrosia coronopifolia Torr. & A.Gray var. gracilis A.Gray
             Ambrosia cumanensis Kunth
             Ambrosia lindheimeriana Scheele
             Ambrosia psilostachya DC. var. californica (Rydb.) S.F.Blake
             Ambrosia psilostachya DC. var. coronopifolia (Torr. & A.Gray) Farw. ex Fernald
             Ambrosia psilostachya DC. var. lindheimeriana (Scheele) Blank.
             Ambrosia rugelii Rydb.
    Ambrosia tomentosa Nutt.+

        bur ragweed, skeleton-leaf bur ragweed, skeleton-leaf bur-sage
             Franseria discolor Nutt.
    Ambrosia trifida L.
        giant ragweed, great ragweed, horse-cane
    Ambrosia trifida L. var. trifida *+

        giant ragweed, great ragweed, horse-cane
             Ambrosia integrifolia Muhl. ex Willd.
             Ambrosia striata Rydb.
             Ambrosia trifida L. var. integrifolia (Muhl. ex Willd.) Torr. & A.Gray
             Ambrosia variabilis Rydb.
    Ambrosia X intergradiens W.H.Wagner X
        intergrading ragweed
             Ambrosia artemisiifolia L. X A. psilostachya DC.

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