Mystery Tree

I'm trying to identify a tree in the back corner of my lot. Here are the leaves and the flowers, which are currently in bloom:

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Here's the bark:

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And here's the entire tree, along with my neighbor's junk:

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The tree ID routines on the web suggest maybe a flowering cherry or other fruit tree, but I don't recall any fruit in the 2 years I've been here. It was partly overshadowed by a maple until I cut the maple back last summer. Maybe it's just been unhealthy? It gets plenty of sun now.

Any ideas?