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*Tribulus Linnaeus. Subfamily: Tribuloideae. Caltrop, Bur-nut.

Key to Tribulus

A genus of about 25 species, herbs, of tropical and subtropical parts of the Old World (introduced in the New World).

Ref: Porter (2016) In Flora of North America Editorial Committee (2016); Sheahan In Kubitzki, Bayer, & Stevens (2007). Show full citations.

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