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