knapweed|knapweeds in English

noun

(Botany) thorny plant with purple flowers gathered in a head with spiny sections just under them

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1. The Mountain Bluet, otherwise known as the Centaurea Montana or Mountain Cornflower, Perennial Cornflower, Mountain Bluets, Knapweed, Mountain Knapweed, Bachelor’s Button, Great Blue-Bottle, is a rather well known perennial plant by gardening enthusiasts around the world.

2. Skinks were not found on portions of the power line access roads with dense spotted knapweed cover.

3. Bighead knapweed is very difficult to control once established and is a threat to our natural areas, including subalpine meadows

4. A rare species of thorny knapweed, Centaurea horrida, is endemic only to Tavolara and a few other fringe areas of northern Sardinia.

5. Many, including Russian thistle, Russian and spotted knapweed, and field Birdweed, have made their appearance within the last seventy-five years, Introduced by man's activities, these plants are hardy, have pushed the native species aside, and taken the best growing areas.