I dunno....it's not dogwood. :)
Still can't find my big book. Now, I'm looking at a "just flower" book. There is a plant that doesn't grow in this area called Meadowrue that the flower looks like it. Never seen or heard of it myself. The leaves are palmate like the ones in Corin's photo but not lance leaves like his. Flowers look pretty much exactly like his. It's a little book and only shows one picture but says there are several species so I'm wondering if it might be another of those species.