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Xanthium Linnaeus. Cocklebur.

Key to Xanthium

A genus of about 3-20 or more species, herbs, cosmopolitan (of somewhat uncertain original distribution). A very broad approach to species delineation has been fashionable (see synonymy); we are convinced that the delineation of more taxa (but not an inordinate number) is warranted and does a better job of representing the diversity within the genus.

Key advice:Mature burs are needed for the identification of most species.

Ref: Cronquist (1980); Fernald (1946); Löve & Dansereau (1959); Millspaugh & Sherff (1919); Strother (2006ee) In Flora of North America Editorial Committee (2006b); Tomasello (2018). Show full citations.

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