Betula papyrifera var. cordifolia (Regel) Regel
Betula papyrifera var. cordifolia (Regel) Regel is a synonym sensu TROPICOS of:
Betula cordifolia Regel, an accepted species name sensu FNA Ed. Comm., 1997.
Betula papyrifera var. cordifolia (Regel) Regel is a synonym sensu TROPICOS of:
Betula cordifolia Regel, an accepted species name sensu FNA Ed. Comm., 1997.