Near the road, alongside the creek we found these flowers up a tree on August 12, so husband Pieter did make some photos and I did look it up and came to the solution: Devil's-Walkingstick - Aralia Spinosa.
At first we were a bit misled because some sites were speaking about this tree having thorny prickles on its stem.
But the Caroline Nature site about
Devil's-walkingstick (Aralia spinosa) did give us the explanation for that.
If you click the above link and scroll down you will read: The name Devil's-walkingstick comes from the trunks of
small trees, which are armed with many stout prickles.
Aha, only the small trees!
Our tree is already quite tall and husband Pieter had to zoom into these flowers.
So we got another mystery solved and now know the name of this tree.
Those flowers were also fragrant, we could smell them when we walked outside.
Do any of you have a Devil's walkingstick?
In The Netherlands we knew the Aralia Elata, or in Dutch: Duivelswandelstok.
Difference Between Aralia Spinosa and Aralia Elata ← click it