butterbur

from WordNet (r) 3.0 (2006)

butterbur
    n 1: small Eurasian herb having broad leaves and lilac-pink
         rayless flowers; found in moist areas [syn: {butterbur},
         {bog rhubarb}, {Petasites hybridus}, {Petasites vulgaris}]

from The Collaborative International Dictionary of English v.0.48

Butterbur \But"ter*bur`\, n. (Bot.)
   A broad-leaved plant ({Petasites vulgaris}) of the Composite
   family, said to have been used in England for wrapping up
   pats of butter.
   [1913 Webster]

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