Noun
A broad-leaved plant (Petasites vulgaris) of the Composite family, said to have been used in England for wrapping up pats of butter.
Source: Webster's dictionaryAnd if you haven’t tried it, experiment with the herbal remedy butterbur (petasites hybridus), in products like Petadolex. Source: Internet
True allergic rhinitis due to environmental allergies usually responds well to antihistamines, as well as to herbal remedies, especially freeze-dried stinging nettle and butterbur. Source: Internet