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Alberta Invasive Plant Identification Guide

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Puncturevine<br />

Tribulus terrestris, Zygophyllaceae (Caltrop Family)<br />

Category: Prohibited Noxious<br />

• Information: Introduced from the Mediterranean and Africa, spread in<br />

sheep wool.<br />

• Life Cycle: Perennial, summer annual in colder climates.<br />

• Root: Woody taproot.<br />

• Leaves: Opposite, 8-16 leaflets, hairy, pinnatley compound, leaflets less<br />

than 1cm wide.<br />

• Stems: Branched, hairy stems radiate from the crown, prostrate (on the<br />

ground) from 10cm to over 1m long.<br />

• Flower: Yellow, 5 petals, 4-10mm wide.<br />

• Seed/Fruits: Pod, 2-3 sharp spines(10mmlong) 4-5 single seeded nutlets,<br />

hard.<br />

• Toxicity: Poisonous to livestock.<br />

• Control: Hand pick, chemical.<br />

Richard Old, XID Services, Inc., Bugwood.org<br />

41<br />

Steve Dewey, Utah State University, Bugwood.org Utah State University Archive, Utah State University, Bugwood.org

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