I'm thinking it could be Chamomile, but I'm not quite sure. This was found in Washington. Any ideas?
Pacific Northwest, it's either Mayweed Chamomile, or Pineapple Chamomile, both members of the fennel family.
As kids, we'd pull the flower heads off and chew on them for the flavor. We grew up with the Mayweed variety.
Your picture is blurred but looks like Chamaemelum nobile (L.) All. from Asteraceae family. It can grow on poor soils and the flowering time is between june and july (maybe september on cold places) on the northen hemisphere. If your picture was taken recently... you have a positive match!
Chamaemelum nobile (L.) All. (Spanish)