tripleurospermum genus --- aster subfamily 2.2  

wild chamomile (Tripleurospermum maritimum ssp. inodorum) -- in May -- Sand Creek National Landmark, WY   ​white & cream 

wild chamomile (Tripleurospermum maritimum ssp. inodorum) -- in July -- Colorado State Forest SP, CO  white & cream    CO-A

wild chamomile (Tripleurospermum maritimum ssp. inodorum) -- in July -- Daniel's Pass, Uinta NF, UT  white & cream     UT-N