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Xanthium speciosum Kearney. Phen: Jul-Aug; Sep-Oct. Hab: Disturbed areas, prairies, roadsides. Dist: MN to SD, south to MO, OK, TX, and Mexico.

Origin/Endemic status: Native

Synonymy: = F, Il; >< Xanthium italicum Moretti – F, Tat; < Xanthium orientale L. – Tomasello (2018); < Xanthium strumarium L. – FNA21, GW2, K3, K4, Mex, Mo2, Pa, Tn, Tx, Va, WH3; < Xanthium strumarium L. ssp. cavanillesii (Schouw) D.Löve & Dans. var. cavanillesii – Löve & Dansereau (1959); < Xanthium strumarium L. var. canadense (Mill.) Torr. & A.Gray – C, G, GrPl, K1, SE1, W

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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: 9

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