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