This budding flower is called Palmate Coltsfoot in my field guide, and Western Sweet Coltsfoot on this site.
Seen in bloom along the west side of State Highway 1. This plant had a height of about 140 cm.
Not so sure about this id. It seems pretty unique. I have seen this before but not so common as others.
Petasites frigidus (Coltsfoot)
West Tiger trail
King County, Washington
Petasites japonicus (Siebold & Zucc.) Maxim., Utterslev Mose, Søborg, Denmark, 10 April 2014
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.