Western Yarrow

Western Yarrow, Common Yarrow, Yarrow,Western
Species:
Achillea millefolium ...

Western Yarrow [English]: Achillea millefolium var. gigantea (Pollard) Nobs
Western Yarrow [English]: Achillea millefolium var. pacifica (Rydb.) G.N.Jones
Western Yarrow [English]: Achillea millefolium ...

It does range also across Canada & the midwest & much of the east coast, so "Western Yarrow" is somewhat a misnomer.

See also: American Larch, Red Pine, Buckeyes, Black Ash, Striped Maple