Publication: Sp. Pl. 2: 987. 1753.
Origin: Introduced from South America (although treated as native in CA by Jeps. Man.)
selected vouchers: WTU
Notes: FNA21: "Some authors have contended that Xanthium spinosum originated in South America and is introduced and/or naturalized everywhere else that it is found."
Considered native to California in Jepson Manual (1993).