bog rhubarb

Từ điển WordNet v3.1 - WordNet Dictionary

noun

small Eurasian herb having broad leaves and lilac-pink rayless flowers;
found in moist areas
• Syn:
butterbur, Petasites hybridus, Petasites vulgaris
• Hypernyms:
herb, herbaceous plant
• Member Holonyms:
Petasites, genus Petasites