[Hilary]

But which one?
This tree is growing in the pavement in Nea Smyrni, a green suburb of Athens.
When the town was laid out, about 1926, it was decided that the building line should be a few meters back from the pavement.
Now, when most of the one story  houses have been replaced by tall blocks of flats, there is still the green 'garden' in front.

[JayB]

The flowers look just like the ones we had on our Washington Palms but that is hardly conclusive.

[Hilary]

Many thanks JayB,

I think this tree must be a Washingtonia robusta Mexican fan palm.
I wonder if the people who planted it in the pavement knew that it grows to 15 meters if not taller?

There are a few of these trees in the central square here in Corinth but they are so tall I have never noticed their flowers or tried to put a name to them.
However, they do make small  bead like seeds.

A year ago to the day I snapped a volunteer growing in a hole in the paving slab.
It was no longer there a few weeks later.