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Noun: bog rhubarb  bóg 'roo,baa(r)b
  1. Small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas
    - butterbur, Petasites hybridus, Petasites vulgaris

Derived forms: bog rhubarbs

Type of: herb, herbaceous plant

Part of: genus Petasites, Petasites