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Small and medium sized puncturevine (Tribulus terrestris) plants showing taproots, flower (upper center), developing fruit (lower right), and dried fruit (lower left) which displays spines and encloses the seed. (Jeff Schalau, University of Arizona/Courtesy)

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Puncturevine (Tribulus terrestris) is a warm season, broadleaf annual weed sometimes called “goat head.” It grows in disturbed areas and vacant lots and can be found throughout Arizona at elevations below 6,500 feet.

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