Achillea genus --- Aster Subfamily 2.1
common yarrow (Achillea millefolium) -- in August -- Arthur's Rock Trail, Lory State Park white & cream
common yarrow (Achillea millefolium) -- in April -- Arapaho Bend Natural Area, Fort Collins, CO
common yarrow (Achillea millefolium) -- in August -- Indian Meadows North, Poudre Canyon, Larimer County, CO
common yarrow (Achillea millefolium) -- in September -- Parvin Lake State Wildlife Area, CO