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. Report from s. FL (Kartesz 2022) is false, based on misidentified specimen.
Origin/Endemic status: Native
Taxonomy Comments: The distinction between var. trifida and var. texana (or at the specific rank A. trifida and A. aptera) warrants additional study.
Synonymy ⓘ: = C, F, G, GrPl, Il, NE; = Ambrosia trifida L. – S; < Ambrosia trifida L. – Fl7, FNA21, K3, K4, Mi, Mo2, NY, Oh3, Ok, Pa, RAB, SE1, Tat, Tn, Va, WH3, McMillan & Prevost (2022)
Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
- Eastern Mountains and Piedmont: FAC (taxonomic split from wetland indicator species)
- Great Plains: FAC (taxonomic split from wetland indicator species)
- Midwest: FAC (taxonomic split from wetland indicator species)
- Northcentral & Northeast: FAC (taxonomic split from wetland indicator species)
Heliophily ⓘ: 6
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© Bruce Sorrie | Original Image ⭷
© Bruce Sorrie | Original Image ⭷
© Bruce Sorrie | Original Image ⭷
© Sonnia Hill | Original Image ⭷
© Alan Weakley source | Original Image ⭷
© J.W. Hardin | Original Image ⭷Feedback
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