caltrap

• tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets
• a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
• Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales
• A genus of herbaceous plants (Tribulus) of the order Zygophylleae, having a hard several-celled fruit, armed with stout spines, and resembling the military instrument of the same name. The species grow in warm countries, and are often very annoying to cattle
• An instrument with four iron points, so disposed that, any three of them being on the ground, the other projects upward. They are scattered on the ground where an enemy´s cavalry are to pass, to impede their progress by endangering the horses´ feet

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