Identify plant please......

Can somebody help me identify this plant or weed that popped up at my house behind a fence? Thanks!
http://home.comcast.net/~ljadkins/wsb/html/view.cgi-home.html-.html
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It's a bit tough to tell from the picture, but my guess would be evening primrose. See: http://www.gpnc.org/evening.htm
Cheers, Sue snipped-for-privacy@earthlink.net Zone 6, Southcentral PA

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It looks like a lilly to me

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