Sea holly, Eryngium variifolium.

Sea holly, Eryngium alpinum.

Conical flower head of Eryngium giganteum surrounded by spiny, silvery bracts.? Paul Tomlins / Flowerphotos

Sea holly, Eryngium variifolium. Spheical head of small, blue flowers surrounded by narrow, spiny, silver bracts.

Sea holly, Eryngium maritimum. Flower heads surrounded by spiny bracts netted with silvery white veins.

Sea Holly, Eryngium tripartitum.

Sea Holly, Eryngium.

Sea Holly, Eryngium bourgatii.

Sea Holly, Eryngium maritimum.

Sea Holly, Miss Wilmott's ghost, Eryngium giganteum 'Miss Wilmott's ghost'.

Sea Holly, Eryngium variifolium.