Eryngium amethystinum
Encyclopedia
Eryngium amethystinum (Amethyst Sea Holly) is a Mediterranean herb
Herb
Except in botanical usage, an herb is "any plant with leaves, seeds, or flowers used for flavoring, food, medicine, or perfume" or "a part of such a plant as used in cooking"...

. Its stem
Plant stem
A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaves, inflorescence , conifer cones, roots, other stems etc. The internodes distance one node from another...

 is 30 to 50 cm long and is light blue to purple in colour. It flowers in the summer. The plant lives in the eastern Mediterranean and prefers dry places and soils that are rich in calcium
Calcium
Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust...

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