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Yellowstone County, Montana
Noxious Weed
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(Tribulus terrestris L.)

Caltrop family - Zygophyllaceae


Puncturevine Puncturevine

Photo from Weeds of the West, revised ed.


Growth Habit: Annual, mat forming, trailing stems to 5 feet long.

Leaves: Opposite, hairy, divided into 4-8 pairs of leaflets. Oval leaflets 1/4 to 1/2 inch long.

Stem: Prostrate, trailing, hairy, many branched from root crown.

Flower: 5 petals, yellow, in leaf axils, to 1/2 inch wide.

Roots: Fibrous.

Seeds: Fruit break into 5 sections with 2-4 seeds per capsule. Capsules tack like structures with 2 sharp spined, resembling the head of a goat.

Reproduction: Seeds.

Habitat: Croplands, pastures, along transportation rights-of-way and in urban areas.

Biological Controls: Puncturevine seed weevil (Microlarinus lareynii), Puncturevine stem weevil (Microlarinus lypriformis).

Herbicides: Roundup Ultramax, Plateau, Telar XP, E2, Oust XP and Method

Produced by Wyoming Weed & Pest Council in cooperation with Sandoz Crop Protection Corp.