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knapweedso called for its knobby heads, from Middle English knap "ornamental knob; bunch or tuft; a button; knot or protuberance on a tree; joint in the stalk of a plant; testicle," from Old English [..]
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knapweedA Plant genus of the Family Asteraceae. Members contain 5-methyl-8-hydroxycoumarin. The common name of centaury is more often used for Centaurium
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