Queen Anne’s Lace is a common midsummer flower that fills open fields in my area. You may not know that it is a wild carrot (Daucus carota) – it is edible, but you should learn to identify the similar poison hemlock if you want to forage for wild carrot. The center of the cluster sometimes has a single purple flower, shown here in a closeup in this small gallery:
The flower is called Queen Anne’s Lace because the queen is supposed to have pricked a finger while lacemaking, and let a drop of blood fall on her lace. Sometimes it’s classified as an invasive plant.