Ambrosia artemisiifolia Linnaeus. Common Ragweed, Hogweed. Phen: Jul-Nov. Hab: Roadsides, gardens, disturbed soils, thin soils on rock outcrops. Dist: NL (Newfoundland), NU, and BC south to FL, TX, CA and southward.

Origin/Endemic status: Native

Synonymy: = Ar, Bah, C, Fl7, G, GrPl, Il, Mex, Mi, NcTx, NE, NY, Oh3, Ok, Pa, Tn, Tx, Va, WH3, McMillan & Prevost (2022); < Ambrosia artemisiifolia L. – FNA21, K3, K4, RAB, SE1; > Ambrosia artemisiifolia L. var. artemisiifolia – F, K1, K2; > Ambrosia artemisiifolia L. var. elatior (L.) Descourt. – F, K1, K2, Tat; > Ambrosia artemisiifolia L. var. paniculata (Michx.) Blank. – F, K1, K2; > Ambrosia elatior L. – S; > Ambrosia glandulosa Scheele – S; > Ambrosia monophylla (Walter) Rydb. – S

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU
• Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
• Great Plains: FACU (taxonomic split from wetland indicator species)
• Midwest: FACU (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily: 8