This is an invasive species from Europe that is now common in pasture land west of the Cascades. It is poisonous to livestock. Not to be confused with Common Tansy.
Photo:
Camp Adair - - - - - August 4, 2010
Photo 2:
Beaver Creek State Natural Area - - - July 24, 2013 Red-shouldered Ctenucha Moths feeding on Tansy Ragwort blossums.
Guide:
Northwest Weeds by Taylor / Pacific States Wildflowers by Niehaus & Ripper
