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Solanum wendlandii
I thought this might be in the bougainvillea family, but again, I am unsure.
I know this flower as Marriage vine or Volcan (not Divorce ;-)...), or Potato vine.
Hi jcbetz ! - I have suggested an ID- S.wendlandii that comes very close to the flowers in your photo. I hope this ID is correct. It's a little difficult to ID flowers without pics of the other parts of the plant.
I hope the reference helps.
The flowers look very similar to the common 'black berry' solanum near our place.
I think this plant belongs to the Solanum family - will need to research further..