• WordNet 3.6
    • n achillea any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads
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Century Dictionary and Cyclopedia
    • n achillea A large genus of perennial herbaceous plants, natural order Compositæ, of the northern hemisphere and mostly of the old world.
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In literature:

For fine white flowers we have the showy achilleas in variety and gypsophila paniculata, called baby breath as a common name.
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
Achillea aegyptiaca, 3; A. filipendula, 4.
"Hardy Perennials and Old Fashioned Flowers" by John Wood
The Yarrows (Achillea) afford us a similar case.
"The Beauties of Nature" by Sir John Lubbock
Achillea Millefolium Yarrow or Milfoil.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various

In news:

Achilleas Zavallis/Agence France-Presse — Getty Images.
An achillea, a baptisia and a nierembergia are three of this year's Classic City Award-winning perennials in the Trial Garden at UGA.