Yarrow (Achillea lanulosa)
Location: Blue River, Colorado, USA
This wildflower is very common in the United States. I photographed this specimen along a roadside in the small town of Blue River, in the Colorado high country.
Yarrow is a member of the Sunflower family (Asteraceae). The website SWColoradoWildflowers.com has this to say about the plant's taxonomic name:
The Achillea genus was named by Linnaeus in 1753 when he also named this species "Achillea millefolium" from specimens collected in Europe. Thomas Nuttall named this species "Achillea lanulosa" in 1834 from specimens collected by Meriwether Lewis in Idaho in about 1806. Weber states that A. lanulosa and A. millefolium are "very closely related" but different species.The plant is said to have some wound-healing properties.