Pictures of this species have been about since before Joe-Pye. After heading out yesterday and once again shooting these nearly iridescent blue pearls, and with continuing frustration with goldenrod species (Yipes, I picked up another new one today!), I felt determined to make this ID! :-) So here goes... I think this is Swamp Dogwood, Cornus foemina. The documentation on this species is sparse and there are indications that C. foemina is a more southerly species but it feels like the best fit.