Definition of "eryngium" []

• Any of the genus Eryngium of umbelliferous plants resembling thistles. (noun)

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• "I'm not sure of the species on this eryngium, but I was completely blown away by its shining purple-blue color."
• "A good number of umbellifers are stable perennials and I use astrantia and eryngium on a regular basis, but Molopospermum peloponnesiacum is a new favourite."
• "I believe sun and drainage is key for the eryngium, even then it flops without some sort of staking."