Carduus (Milk Thistle).

Coarse hardy annuals; somewhat ornamental, but are hardly more than weeds. They grow freely from seed, and flower from June to August. Height, 2 ft. to 4 ft.

Related posts:

1. Milk Thistle.
2. Echinops (Globe Thistle).
3. Lactuca Sonchifolia. (Sow Thistle-Leaved Lettuce).
4. Globe Thistle.
5. Centranthus.