What is this ornamental tree with coarsely serrated leaves?

Question

All I know is that the tree is small (2m), is grafted at 1m, has (or can be pruned into) 'globosum' habit, and have such leaves:

enter image description here

Another picture: (the trees in question are in the group in the middle):

Can you guess the species name or at least point me towards its genus until I can upload pictures for this tree's other characteristics?

New photos, sunny April day:

Some leaves have most unusual 'nipples', never saw such leaves before.

"unusual leaves"? To me they seems very similar to oaks, so common form. — Giacomo Catenazzi, Dec 18, 2017 at 10:24
Sorry to put it so bluntly, but from the little we can see, I see nothing super unusual about the leaves. For a good id we’d need one full leaf, ideally top and bottom and some scale. And if you mean the color, I guess we are looking at autumn discoloration? I can’t blame @GiacomoCatenazzi for not answering. — Stephie, Dec 18, 2017 at 13:00
“Nothing special” as in “no truly distinctive feature that gives a good clue”. And you were the one who originally wrote “unusual”, which @GiacomoCatenazzi probably responded to. I realize that you don’t have more photos, I just wanted to point out that what you have might be not enough for a good id. — Stephie, Dec 18, 2017 at 13:12
Just being able to see only three entire leaves, and one of those sideways on, the other chopped off at the edge of the photo, means its impossible to say whether its Persian Oak or anything else for sure - not having a crystal ball, its the best educated guess I can make anyway — Bamboo, Dec 18, 2017 at 16:04

Bamboo · Accepted Answer · 2018-04-21 13:52:47Z

1

I think it might be Hornbeam (Carpinus betulus), complete with gall nipples, as Stephie says. Image here https://www.bowhayestrees.co.uk/hornbeam.html

answered Apr 21, 2018 at 13:52

Bamboo

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too few veins to be Carpinus betulus (on my zone, we use number of veins to distinguish it from Ostrya carpinifolia. I'm going to Morus (but I need to think it, or check some flora, no time now)
– Giacomo Catenazzi
Apr 21, 2018 at 17:12
@vividd: Could you check again the plant? If it is Carpinus betulus, now it should have the catkins.
– Giacomo Catenazzi
Apr 27, 2018 at 6:13
BTW Carpinus seems a better match then Morus. But still.... not convinced (maybe some Alnus, which could have a very small habit)
– Giacomo Catenazzi
Apr 27, 2018 at 6:29

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