Flora of the Southeastern United States
2022 Edition


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Ambrosia trifida Linnaeus var. trifida . Giant Ragweed. Phen: Jul-Nov. Hab: Floodplains, moist pastures, disturbed ground. Dist: NS and BC south to n. peninsular FL, Panhandle FL, TX, and CA.

Origin/Endemic status: Native

Syn: = C, F, G, GrPl, Il, NE; = Ambrosia trifida – S; < Ambrosia trifida – Fl7, FNA21, K3, K4, Mi, Mo2, NY, Oh3, Pa, RAB, SE1, Tn, Va, WH3, McMillan & Prevost (2022)

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image of plant© J.W. Hardin [image randomly selected]