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Puncturevine
Tribulus terrestris |
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Rosette

Leaves are compound pinnate with four to eight pairs of leaflets. Each leaflet is less than half an inch long. |
Adult
 Puncturevine is an annual, spreading its multiple stems prostrate along the ground. Stems may be up to five feet long.
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Flower
 Small yellow flowers have five petals and are about one-third inch wide. Bloom is in late spring and early summer. |
Weed Infestation

A native to Europe, puncturevine is common along roadsides, in farm areas, pastures, cultivated fields, and waste areas. Hard spiny seeds damage bike tires and thin walled car tires, and injure livestock.
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Seedhead
 The flowers produce hard, spiny, five-lobed fruits. At maturity the fruit breaks into tack-like structures each containing two to four seeds. |
Taproot
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