Tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed.

synonyms: devil's weed, Tribulus terestris.

A plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits.

synonyms: water chestnut, water chestnut plant.

Dutch: kalketrip

Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America.

synonyms: Centauria calcitrapa, star-thistle.