Sea Holly
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Eryngium
Common along the British Coastline.
The flowers are bluish white, 8 mm across, in 1.5–2.5 cm heads.
The whorl of leaves under the heads (bracts) are spiny and leaf-like, and the small bracteoles among the flowers are 3-spined.
The sepals, 4–5 mm, are longer than the petals.
It flowers June to September, and the flowers are attractive to Butterflies.