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bullweed
From The Collaborative International Dictionary of English v.0.48:
Knapweed \Knap"weed`\, n. (Bot.) The black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Bullweed \Bull"weed`\, n. [Bole a stem + weed.] (Bot.) Knapweed. --Prior. [1913 Webster]

