Anthemis

The receptacular chaff is usually quite visible as the slender bristle-like tips extend well up among or beyond the tips of the mature disk flowers.

1. Receptacle completely chaffy (all the way to the marginal disk flowers); ray flowers pistillate; involucre ca. (4–) 4.5–6 (–6.5) mm long; achenes ribbed but otherwise smooth; plant nearly or quite odorless.

A. arvensis

1. Receptacle not chaffy around the marginal flowers of the disk; ray flowers sterile; involucre ca. 3–4.2 mm long; achenes warty-tuberculate; plant with unpleasant odor.

A. cotula

All species found in Anthemis

Anthemis arvensisCORN CHAMOMILE, FIELD CHAMOMILE 
Anthemis cotulaMAYWEED, DOG-FENNEL, STINKING CHAMOMILE 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 17, 2017. http://michiganflora.net/genus.aspx?id=Anthemis.