Name: Anne Summerville, SC (Zone 8a) Only dead fish go with the flow!
Definitely a Datura - if the blooms start opening in the evening and close by mid morning, what you have there is Datura innoxia like Lyn said.
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams
It is Datura. 
