A close up of one of the flowers of the Agrostemma / mugi-nadeshiko in Japanese.
When I first saw this flower, I thought what a beautiful flower, it looked like a Singapore frangipani. It is an Agrostemma, there’s a bright pink version according to my Japanese ID book. In Japanese, it’s called mugi-nadeshiko which means buckwheat (from the leaves) — dianthus (resemblance to flower-shape)…a very appropriate description of the flower.
An usual white assemby of several flowers here – white dogwood (centre right) – agrostemma (left below) and fothergillas (behind upper) is found in this garden.