Any chance of a better photo of the white flowers? It's difficult coming up with a plant family without sharper images.

I will try for a better photo of the bloom tomorrow. After looking, I think it may be a form of hydrangea arborescens.

I don't think flower one is a hydrangea, but I don't know what it is.

I am puzzled, too. The leaves are also not a match for Hydrangea arborescens.

There has to be an answer........ It has opposite leaves. Is it definitely woody?

H. arborescens below that popped up in my garden and was cut to the ground in late spring.

It is very small but the stem does appear to be woody.

Bringing this back up for more views, possible identification of your mystery plant.

This white flower has me puzzled as well. You would think something with such unusual petals would be more widely known.

Agreed. I feel like I should know this if it were some native or ornamental plant which leads me to think that it's either got malformed flowers or it's it's some odd tropical that I've never heard of... either way I'm stumped.

The peripheral sterile flower, and central petal-less fertile-bud like flower have the hydrangea or viburnum characteristics. This reminds me to Viburnum plicatum although stature and leaves bit different, but growing condition could affect this one..I guess

Viburnum plicatum 'Summer Snowflake'

or it could also be something else

Tofi, I think that you have hit on the right identity. I have a double-file viburnum in another part of my garden. Comparing the leaves of these two, they look almost identical. Thank you kindly.

Oh Tofi,I feel like a weight has been lifted off of me. Viburnum,who would have thought? How brillant! What was also thowing me off was that it seemed shrub-like,but was blooming at such a small size. This is great news. It all makes sense now what the smaller flowers were. I'm amazed also that Viburnum never crossed my mind and a lot of others.

Glad, if i could join in any help. I saw them when I was living abroad, but now get back to my home country. Will be miss to watch those non tropical flower in person again, with all their changes along the seasons,... Here it is ever summer... but this forum keeps us with the connection and great memories...