Eryngium variifolium 

Bold marbled leaves and steel-blue buds make this sea holly a standout for sunny, well-drained spots, a drought-loving plant.

Moroccan Sea Holly, is a striking evergreen perennial prized for its marbled (variable) foliage and thistle-like, grayish-blue flowers from December. It forms a clump-forming rosette of dark green leaves with prominent white veins. The plant thrives in full sun with good drainage and manages well in poor to average soils. Drought tolerant. Plant of the Year 1987 in Germany. Sun. 40cm

peganum from Small Dole, England

Closeup: Kurt Stüber, via Wikimedia Commons