Acer platanoides
It is closely related to, and in some respects intermediate between, "Acer cappadocicum", from Asia, and "Acer platanoides", from further north in Europe, hence "Acer platanoides" subsp. "lobeli". The suggestion has been made that it could be a natural hybrid between them, but differences from both, notably the strongly glaucous bloom on the young shoots, make treatment as a distinct species more reasonable.