Emigrant Wilderness, Huckleberry Lake, July 2014

  • Achillea millefolium L.
  • Common yarrow, Yarrow, Milfoil, Western yarrow
  • Asteraceae (Aster Family)
  • Synonym(s):
  • USDA Symbol: ACMI2
  • USDA Native Status: L48 (NI), AK (N), HI (I), CAN (NI), GL (N), SPM (NI)

Yarrow grows to 3 feet tall and has no branches except near the top. The leaves are alternate, 3-5 inches long, with many leaflets on each side of the midrib (1- pinnately lobed); and these are further divided into smaller leaflets, giving them a delicate, fernlike, lacy appearance. Flower heads are arranged in large, compact clusters at the top of the stem, each cluster consisting of 1 or more flower heads. The flower head has 20-25 yellowish-white (rarely pink) ray flowers and similarly colored disk flowers.

Achillea millefolium is highly variable and has been treated both as a single species with varieties and as multiple distinct species. A. millefolium is cosmopolitan throughout the Northern Hemisphere. In North America, A. millefolium is a complex of both native and introduced plants and their hybrids.

Sourced from: http://www.wildflower.org/plants/ -- and -- Wikipedia

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