Xanthium orientale Linnaeus. Phen: Aug-Oct. Hab: Disturbed ground, roadsides, pastures, barnyards. Dist: Widespread in e. North America, and now nearly cosmopolitan; the details of its original distribution uncertain.
Origin/Endemic status: Native
Synonymy: = n/a – RAB; < Xanthium orientale L. – Tomasello (2018); > Xanthium pensylvanicum Wallr. – F, Il; < Xanthium strumarium L. – Bah, Fl7, FNA21, GW2, K3, K4, Mex, Mi, 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, NcTx, NE, Oh3, SE1, W
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