Please identify this flower.

Please help me identify this flower.
The plant is about 3 feet high. It has purple trumpet-like blooms. It was in zone 6 in September 2010.
Photographs at http://www.facebook.com/album.php?aid !12917&id53707912&lL39d81a7d .
You can click on the photo to see an enlarged picture.
Thank you for all replies!
Ted Shoemaker
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Mexican petunia?
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