Prunus (Sato-zakura Group) 'Tai-haku'
Common name: Great white cherry
Prunus (Sato-zakura Group) 'Tai-haku' is a white-flowering Japanese cherry tree. We have two specimens on the Great Lawn. It had nearly died out in Japan 100 years ago, but thanks to an Englishman, 'Cherry' Ingram, it was reintroduced to that country where it is now flourishing - see Garden Story.
Close-up flower photos: https://landscapeplants.oregonstate.edu/plants/prunus-tai-haku (pink-centred flower is mature; white-centred is young)
Photos from the mother tree in Ingram's garden: https://www.collingwood-cherry-ingram.com