Checklist » Asteraceae » Xanthium spinosum
Last updated 11/28/2020 by David Giblin.
Xanthium spinosum L.[FNA21, HC, HC2]
spiny clotbur, spiny cockleburr

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).

References: (none)

Synonyms & Misapplied Names:
Xanthium ambrosioides Hook. & Arn.
Xanthium spinosum L. var. inerme Bel