Betula papyrifera var. humilis (Regel) Fernald & Raup
Betula papyrifera var. humilis (Regel) Fernald & Raup is a synonym sensu FNA Ed. Comm., 1997 of:
Betula pendula subsp. mandshurica (Regel) Ashburner & McAllister, an accepted subspecies name sensu POWO.