In article ,
[Iris Cohen] wrote...

I am still trying to find the correct classification for Betula 'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy. Well, let me
tell you the entire leaf, petiole, & twig are fuzzier than a peach.

Well, FWIW,

http://plantsdatabase.com/go/51688/

says it's _Betula pendula_.

http://www.bonsai-bci.com/species/birch.html
http://www.bonsai-bci.com/species/botanical_index.html

agree, as do various other "hits" on my initial search.
Is there a reason to doubt this ID is correct? I didn't
see any pages giving it a different species name in a
cursory glance through the first few screens of search
results.

regards.