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Originally Posted by jeremy_norbury
I suspect is is a cross between a common elm - which grow abundantly here in my neighbourhood and some ornamental variety....
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About 2 years ago, I spent my spare time all winter studying the litterature on elm breeding and elm genetics. No, I don't have a life. Anyway, one person reported quite a series of interspecific elm crosses. Some did indeed give small, slow-growing seedlings with tiny leaves Other crosses gave extremely vigorous, fast-growing hybrids with huge leaves.
I still have my notes, if anyone wants to know which species gave the smaller hybrids. I don't have them with me just now.
All elm species will intercross, with the exception of the American elm, which has 4 sets of chromosomes instead of two sets like the other species. Even with the American elm, some crosses have succeeded.
And even the late blooming species like Chinese elm have crossed artificially with early spring blooming elms like Siberian elm, producing fertile hybrids.
O, My point was that it might indeed be a hybrid between a common elm, whichever elm is common in your area, with a some ornamental elm.