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Matricaria

1. Ray flowers present, white; disk corollas 5-lobed; plant aromatic when bruised.

M. chamomilla

1. Ray flowers none; disk corollas 4-lobed; bruised plant with pleasant fruity (pineapple) odor.

M. discoidea

All species found in Matricaria

Matricaria chamomillaFALSE CHAMOMILE 
Matricaria discoideaPINEAPPLE-WEED 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 29, 2017. http://michiganflora.net/genus.aspx?id=Matricaria.