Bermudagrass Johnsongrass Medusahead Quackgrass Field Bindweed Sufur Cinquefoil Hoary Cress Oxeye Daisy Poison Hemlock Black Henbane Houndstongue St. Johnswort Diffuse Knapweed Russian Knapweed Spotted Knapweed Squarrose Knapweed Purple Loosestrife Perennial Pepperweed Saltcedar Leafy Spurge Yellow Starthsitle Canada Thistle Musk Thistle Scotch Thistle Dalmatian Toadflax Yellow Toadflax Dyer's Woad Back to main weeds page   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 Back to main weeds page   Buffalobur CommonBurdock Camelthorn Goatsrue Jointed Goatgrass Blue-Flowering Lettuce Western Whorled Milkweed Silverleaf Nightshade Yellow Nutsedge Puncturevine Russian-Olive Bull Thistle Velvetleaf