The invasive calcitrapa of the plant world, Goat's-head vines (Tribulus terrestris) are adapted to dry arid climates and the bane of summer fun in the West. It likes to grow on hiking paths and likely camping spots.
Local Idaho legend says that wardens at the old Idaho Penitentiary planted these weed in the fields surrounding the penitentiary to discourage inmates from escaping. I think that the rumor I just started about a conspiracy of veterinarians working in conjunction with bike inner tube manufactures is more likely.
The species is difficult to control because of the extremely long seed viability in the soil seed bank and the protective coating on the leaves and stems that make it resistant to herbicides. Manual labor paired with healthy native species to choke out growth is the best option for localized control.

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