Flora of the Hawaiian Islands
Dicotyledon Literature for Achillea millefolium
Wagner et al., 1990, 1999.
   Asteraceae -- The Sunflower Family Bibliography
      Achillea millefolium

Common name(s): yarrow, common yarrow, milfoil
General Information
DistributionNative to circumboreal temperate regions.In the Hawaiian Islands, naturalized on Hawai`i.

Rhizomatous perennial herbs 2-5(-10) dm tall.
Leaves lanceolate to linear, blades 3-15 cm long, 0.5-2.5 cm wide, only the lowermost petiolate.
Involucre 3.5-5 mm high, 2-4 mm in diameter; ray florets usually 3-5 per head, rays white to pink, 2-3 mm long; disk florets 10-20 per head.
2n = 18, 34, 36, 45, 54, 58, 72, 116