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