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Puncturevine
Tribulus terrestris
 
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.
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.
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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Buffalobur

CommonBurdock

Camelthorn

Goatsrue

Jointed Goatgrass

Blue-Flowering Lettuce

Western Whorled Milkweed

Silverleaf Nightshade

Yellow Nutsedge

Puncturevine

Russian-Olive

Bull Thistle

Velvetleaf