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