Globe Thistle, Echinops bannaticus.

Thistle, Spear thistle, Scotch thistle, Bull thistle, Cirsium vulgare.

Thistle, Spear thistle, Scotch thistle, Bull thistle, Cirsium vulgare.

Milk Thistle, Blessed Mary thistle, Silybum marianum.

Sea holly, Eryngium variifolium.

Sea holly, Eryngium alpinum.

Thistle, Onopordum acanthium, Scotch thistle, Cotton thistle.

Thistle, Onopordum acanthium, Scotch thistle, Cotton thistle.

Globe thistle, Echinops bannaticus 'Taplow Blue'.

Dandelion clock, Taraxacum officinale.

Dandelion clock, Taraxacum officinale, Seedhead against blue sky with individual seeds dispersed by wind on a pappus of fine hairs.

Spherical flower heads of Echinops ritro Veitch's Blue.