1. Corollas yellow; leaves pinnatifid, with toothed segments.
A. filipendulina
1. Corollas white (or pink); leaves either finely dissected or merely toothed.
2. Leaves finely dissected; rays (1โ) 1.2โ3 mm long.
A. millefolium
2. Leaves simple, linear-lanceolate, sharply and closely (but finely) toothed; rays ca. 4โ6 mm long.
A. ptarmica
All species found in Achillea
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 1, 2021. https://michiganflora.net/genus.aspx?id=Achillea.