Mystery Plant

Also from my walk at Catherine Creek. This is mystery plant must have a larger clustered flower when it's blooming. The seeds caught my eye, because they are as big as sunflower seeds, and really pretty!  The plant has leaves like dill. Maybe some sort of wild dill or maybe fennel? It would help to have visited last month when the flower was blooming.  Or to have rubbed the leaves a bit to see if they had a strong scent. (I didn't think of that until now.) I searched on a great database-type website for Catherine Creek flowers, linked here. Any ideas?