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Known by the common names of Yarrow or Milfoil, these strongly scented perennials have alternate leaves, which are simple to 3-pinnately dissected. For the inflorescence: heads are generally radiate, in flat-topped clusters; The ray flowers are few, white, pink, or yellow. Disk flowers are typically many, and corollae are short, white to purple or yellow. Fruits are oblong to obovate.