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I think it's bindweed too.
Looking at images of both plants, I can't really see how this would be a moon flower. The floral shape is reminiscent, but has to many differences. This flower was also low growing, something admittedly not included in the reference pictures.I agree with bindweed
I agree with Moonflower.
Lat: 36.74, Long: -96.12
Spotted on May 25, 2013 Submitted on Jun 8, 2013