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water chestnut, caltrop, water chestnut plant | a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | |
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star-thistle, caltrop, Centauria calcitrapa | Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | |
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caltrop, devil's weed, Tribulus terestris | tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed |