Carduus L.

Pappus of simple bristles Carduus
Flower heads solitary, spherical, 4–5 cm diam. Florets red-purple. Biennial up to 1.5 m high. Widespread. Weed of cultivation and waste places. Introd. from Europe. Fl. spring–summer. Musk or Nodding Thistle Carduus nutansnutans
Flower heads in terminal clusters