Mystery plant identification?

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Seems I've got nothing but mystery plant questions these days, but this is for a friend in Michgan. *Now*, I realize Michigan is about as far from Mediterranean gardening as possible, but you all are very very knowledgable so I thought of you. The plant in question is a tree friend sees around where he lives. I had him take some close up shots of the leaves and flower (buds), as well as a full shot of the trees, so perhaps this will be helpful in identifying them?

Full shot of the trees in question: http://i46.tinypic.com/2ppj606.jpg

Close up of leaves and flower buds. Friend's hand is holding onto one of the branches in shot: http://i45.tinypic.com/24l2ypj.jpg

Any ideas?

Thank you!

Barry