What are these white flowers growing on this tree?

My grandma's neighbor has a tree that is about fifteen feet tall or so, and there are these white flowers that have sort of a ball shape, but also look sort of like miniature crabapple flowers. The flowers themselves smell a little like lilac, but are completely white. Does anyone have any idea what kind of tree/flower this is; they are gorgeous, but no one can figure out what they are.

What are these white flowers growing on this tree?
My guess is Viburnum. There are eleventy-billion kinds of viburnum...but they all have white flowers, and they all smell really great...and some are snowball shaped clusters.
Reply:Magnolia, maybe?





http://home.att.net/~magnoliaimages/Judy...
Reply:they could be dogwood



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