puncturevine

Tribulus terrestris L.

Description from Invasive.org

Appearance
Tribulus terrestris is an annual, low-spreading forb native to the Mediterranean.
Foliage
Leaves are opposite, hairy, 1-3 in. (2.5-7.6 cm) long, and divided into 8-18 oblong leaflets.
Flowers
Flowering occurs from midsummer to frost, when 5-petaled, yellow, 0.5 in. (1.27 cm) wide flowers develop singly in the axils of the leaves.
Fruit
Fruit are circular, spiny burs that split into 5 sections. Burs can cause injury to bicycle tires, bare feet, and even small truck tires.
Ecological Threat
Plants invade roadsides, pastures, fields and other disturbed areas. Plants are toxic to sheep and other grazers.

Selected Images from Invasive.org

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Plant(s) in flower
Steve Dewey, Utah State University, Bugwood.org
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Foliage
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
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Plant(s)
Steve Dewey, Utah State University, Bugwood.org
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Plant(s)
Steve Dewey, Utah State University, Bugwood.org
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Flower(s) flower and fruit
Forest and Kim Starr, Starr Environmental, Bugwood.org
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Flower(s) flower and leaves
Forest and Kim Starr, Starr Environmental, Bugwood.org
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Flower(s)
Steve Dewey, Utah State University, Bugwood.org
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Fruit(s) fruit
Forest and Kim Starr, Starr Environmental, Bugwood.org
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Fruit(s)
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
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Fruit(s) Thorns
Utah State University , , Bugwood.org
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Plant(s) Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 2: 442.
USDA NRCS PLANTS Database , USDA NRCS PLANTS Database, Bugwood.org
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Feature(s) Burs stuck into tractor tire
Utah State University , , Bugwood.org
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Distribution