Тема: Betula
It is not Betula glandulosa Michx.
According to K. Ashburner and H. McAllister ("The Genus Betula", Kew Publishing, 2016) Betula glandulosa Michx. = Betula rotundifolia Spach.
Re: Betula
There is some Betula ×glandulosa Berl. May it be this species?
Re: Betula
There is no such name as Betula glandulosa Berl. Its appearance in the databases is a result of misunderstanding:
https://biodiversitylibrary.org/page/32396330