Checklist » Asteraceae » Xanthium strumarium
Last updated 12/5/2008 by David Giblin.
Xanthium strumarium L.[FNA21, HC, HC2]
Canada cocklebur, common cocklebur

Publication: Sp. Pl. 2: 987. 1753.

Origin: Native

selected vouchers: WTU

Notes: Vars. only weakly separated, following Jeps. Man. not worth recognition, "populations show founder effects"

FNA21: "Recognition of a dozen or more taxa (treated as species, subspecies, varieties, and/or forms) has been proposed for plants treated together here as Xanthium strumarium. Bases for the various taxa mostly involved subtle differences in the burs."

References: (none)

Synonyms & Misapplied Names:
Xanthium strumarium L. var. canadense (Mill.) Torr. & A. Gray[HC]
Xanthium strumarium L. var. glabratum (DC.) Cronquist[HC]
Xanthium strumarium L. var. oviforme (Wallr.) M. Peck
Xanthium strumarium L. var. pensylvanicum (Wallr.) M. Peck
Xanthium strumarium L. var. strumarium
Xanthium strumarium L. var. wootonii (Cockerell) W.C. Martin & C.R. Hutchins, invalidly published