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Mystery plant with the disappearing flower!

Could anyone please help ID the mystery plant shown below. It is residing in a border at my in laws house. Visible now a shrub has been removed I believe. Nobody can remember it being planted! 

The flower appears when in sunlight and disappears (presumably just closes?) when falling into shade. Is this very common?

first three pictures taken yesterday afternoon in shade, last picture taken this morning in the sun.

Thanks in advance for any help.


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