Tripleurosperum inodorum   false or scentless mayweed
           (Alt: Matricaria maritima )
Asteraceae (Alt: Compositae )
non-native                      herbaceous           
Distribution: South Boise

USDA Plants Link: Tripleurosperum inodorum   (TRMAM)

False mayweed (Tripleurospermum inodorum) is currently known in the Boise Front only from Hubbard Reservoir.  It superficially resembles the somewhat more common true mayweed (Anthemis cotula), but has more finely divided leaves, distinctively 4-angled achenes, and no spike-like bracts on the receptacle.