butterbur

Its chief haunts, among the butterbur (Petasites), are in the northern counties from Cheshire to Durham.
The Moths of the British Isles, First Series|Richard South
The Common Butterbur grows in wet places, especially beside streams.
Flowers Shown to the Children|C. E. Smith
The flower of Butterbur, he writes, is the first to appear, before the plant or leaves.
Herbals, Their Origin and Evolution|Agnes Arber
As an instance of his manner we may cite his account of the Butterbur, of which his wood-cut is shown in Text-fig.
Herbals, Their Origin and Evolution|Agnes Arber

So, too, the butterbur of the river flowers before its great leaf comes.
Field and Hedgerow|Richard Jefferies

British Dictionary definitions for butterbur

butterbur

/ (ˈbʌtəˌbɜː) /

noun

a plant of the Eurasian genus Petasites with fragrant whitish or purple flowers, woolly stems, and leaves formerly used to wrap butter: family Asteraceae (composites)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012