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Ambrosia L.


Ambrosia artemisiifolia

Credit: HAST

Coarse herbs, perennial or annual. Leaves opposite or alternate, usually lobed or dissected. Florets greenish, inconspicuous. Heads unisexual, without ligulate florets, of 2 kinds, staminate heads conical, in terminal racemes, involucre flattish, of bracts 7-12, united, florets 5-20, anthers nearly distinct; pistillate heads ellipsoid to obovoid, with 4-8 small tubercles (representing tips of connate bracts) at apex, 1-few together, sessile in axils of leaves below staminate racemes; styles elongate, branches exserted. Achenes ovoid.

About 40 species in the New World. One American species widely naturalized in eastern Asia.


1 Leaves pinnatifid.   Ambrosia psilostachya
+ Leaves bi- or tripinnatifid.   Ambrosia artemisiifolia

Lower Taxa

Related Synonym(s):


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