Name that tree?
Okay, I feel rather stupid having to ask this. I see a tree that must be as common as dirt, but I don't know what it is. It's blooming right now in the Philadelphia suburbs. It has white flowers that are in clusters. It's not a Bradford Pear -- it doesn't have that "tidy" shape, it's more spreading.
It's not a magnolia.
I see it everywhere, including on those parking lot islands. It's small to medium in size. What the heck is it?