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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]


The Collaborative International Dictionary of English v.0.48:

Bullweed \Bull"weed`\, n. [Bole a stem + weed.] (Bot.)
   Knapweed. --Prior.
   [1913 Webster]