A Wednesday Worisit

A friend recently departed these shores earlier this year to live in Turkey. She has sent me a horticultural poser. This grows in her garden and neighbourhood. Sadly the flower buds on her plants are dropping off without setting flowers but local plants are sporting pink or white flowers. It looks vaguely familiar to me but I am unable to think of a name so any ideas would be welcome. A special thank you to everyone who recently came up with suggestions as the identity of my mother's missing plant - conversations with my mother will continue, hopefully with a conclusion this time.