Betula alba var. cordifolia (Regel) Fernald nom. illeg.
Betula alba var. cordifolia (Regel) Fernald nom. illeg. is a synonym sensu IPNI of:
Betula cordifolia Regel, an accepted species name sensu FNA Ed. Comm., 1997.
Betula alba var. cordifolia (Regel) Fernald nom. illeg. is a synonym sensu IPNI of:
Betula cordifolia Regel, an accepted species name sensu FNA Ed. Comm., 1997.