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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Achillea

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1 Heads golden yellow
1 Heads white or pinkish.
  2 Leaves serrate to almost entire; ray laminae 4-5 mm long; phyllary margins brown; [section Ptarmica]
  2 Leaves pinnately dissected into linear segments; ray laminae 1.5-3 mm long; phyllary margins green or brown; [section Achillea]
    3 Fresh leaves elaborately 3-dimensional, the linear segments arrayed in a 3-D arrangement several millimeters “thick”; [common native]
    3 Fresh leaves essentially flat, the linear segments arrayed in a plane; [rare exotic]
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