Mendocino County, California, US
Wild in garden
on bank of road in partial shade; probably result of garden waste dumping
Memorial Park BioBlitz September 2014
Petasites japonicus subsp. giganteus.
ID on sign
The plants commonly referred to as Butterbur are found in the daisy family Asteraceae in the genus Petasites. They are mostly quite robust plants with thick, creeping underground rhizomes and large Rhubarb-like leaves during the growing season. Another common name for many species of this genus is Sweet Coltsfoot.