Photo: Eryngium agavifolium.

Leaf rosette. Yep, it's agavifolium alright. Tirups örtagård, Lund, Sweden. Planted. 2005-06-08.
Eryngium agavifolium Griseb. Deu.: Agavenblättriger Mannstreu. Sven.: agavemartorn
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Photo: Eryngium agavifolium.