Sea holly

Eryngium maritimum

"Eryngium maritimum", the sea holly or seaside eryngo, is a species of "Eryngium" in the plant family Apiaceae and native to most European coastlines. It resembles a plume thistle in that its flower is burr-shaped, but the flowers are metallic blue rather than mauve.
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Appearance

Protected from winds this dune plant grows to a height of 20 to 60 cm. Although widespread, it is considered endangered in many areas, such as Germany where its occurrence has been greatly reduced throughout and has become locally extinct in several districts.
Sea holly (Eryngium maritimum) Flower of the sea holly (Eryngium maritimum) Eryngium maritimum,Fall,Geotagged,Netherlands,Sea holly,flora

Cultural

In Elizabethan times in England, these plants were believed to be a strong aphrodisiac. They are named in a speech by Falstaff:

"Let the sky rain potatoes;
let it thunder to the tune of Green-sleeves,
hail kissing-comfits and snow eringoes [sea-holly],
let there come a tempest of provocation..."

"Falstaff", Act 5, scene v, "The Merry Wives of Windsor", William Shakespeare

Sea holly was nominated the 2002 County flower for the city of Liverpool.

References:

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderApiales
FamilyApiaceae
GenusEryngium
SpeciesE. maritimum