Carduus

• welted thistle

  European biennial introduced in North America having flower heads in crowded clusters...

• musk thistle

  Eurasian perennial naturalized in eastern North America having very spiny white cottony...

Also contains

• plume thistle

  Any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally...

• carline thistle

  A thistle of the genus Carlina.

• golden thistle

  Any of several spiny Mediterranean herbs of the genus Scolymus having yellow flower...

• woolly thistle

  Biennial Eurasian white hairy thistle having pale purple flowers; naturalized in...

• field thistle

  Stout North American thistle with purplish-pink flower heads.

• melancholy thistle

  Perennial stoloniferous thistle of northern Europe with lanceolate basal leaves...

• sweet sultan

  Annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves...