Common Butterbur (Petasites hybridus) is a herbaceous perennial plant in the family Asteraceae, native to Europe and northern Asia.
The flowers are produced in the early spring, before the leaves appear; they are pale pink, with several inflorescences clustered on a 5-20 cm stem.
The leaves are large, on stout 80-120 cm tall stems, round, with a diameter of 40-70 cm.

The name comes from what is said that its leaves have been used in England for wrapping up pats of butter.
It is also called Bog rhubarb, Devil's hat and Pestilence wort.