welted thistle(n = noun.plant) carduus crispus - European biennial introduced in North America having flower heads in crowded clusters at ends of branches;
is a kind of thistle
is a member of carduus, genus carduus

barnaby's thistle, blessed thistle, blue thistle, boar thistle, brook thistle, bull thistle, canada thistle, carline thistle, common carline thistle, cotton thistle, creeping thistle, european woolly thistle, field thistle, globe thistle, golden thistle, holy thistle, horse thistle, lady's thistle, melancholy thistle, milk thistle, musk thistle, nodding thistle, our lady's mild thistle, plume thistle, plumed thistle, russian thistle, scotch thistle, sow thistle, spear thistle, stemless carline thistle, thistle, white thistle, woolly thistle