Gabler
Masterpiece
@leatherback has it right. There are differences between European and American hornbeams and beeches, but the differences between European beeches and European hornbeams are the same as the differences between American beeches and American hornbeams (a.k.a. ironwood or musclewood). In American hornbeams, the difference is actually more pronounced, since the buds aren't even half a centimeter, whereas the beech buds on both species are nearly an inch long.
From OregonState.edu
Carpinus caroliniana from TreeTopics.com
Carpinus betulus, also from Oregon State
From OregonState.edu
Carpinus caroliniana from TreeTopics.com
Carpinus betulus, also from Oregon State