1. Ray flowers present, white; disk corollas 5-lobed; plant aromatic when bruised.
1. Ray flowers none; disk corollas 4-lobed; bruised plant with pleasant fruity (pineapple) odor.
All species found in Matricaria
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 25, 2018. https://www.michiganflora.net/genus.aspx?id=Matricaria.