Common name: Common yarrow

USDA list 12 varieties of which six are found in WA state. ITIS lists none.

"Achillea millefolium is morphologically variable and has been treated as either a single species with varieties or as multiple distinct species. At least 58 names have been used for North American specimens.

Morphologic characters that have been used to segregate these populations into species and/or varieties include: (1) degree and persistence of tomentum; (2) phyllaries with greenish, light brown, or dark brown margins; (3) shapes of capitulescences (rounded or flat-topped); and (4) degrees of leaf dissection and shapes of lobes.

While examining specimens for this treatment, two general trends were noted: (1) Plants growing either at high latitudes or high elevations tend to have darker colored margins on the phyllaries. (2) Plants at high latitudes or elevations or from extreme desert locations tend to be more densely lanate than plants from less extreme habitats. These are only trends; variations in local populations due to local environmental conditions are to be expected."

from eFloras.org

north Puget Sound; Columbia River Gorge;
TRAIL: Washington Park, Fidalgo Island; Dog Mountain
HABITAT: Coastal, bluff
ELEVATION: 15 m (50 ft.)
BLOOM TIME: 10-MAY; 04-JUL;