Betula papyrifera subsp. occidentalis (Hooker) Hultén
Betula papyrifera subsp. occidentalis (Hooker) Hultén is a synonym sensu FNA Ed. Comm., 1997 of:
Betula occidentalis Hooker, an accepted species name sensu FNA Ed. Comm., 1997.
Betula papyrifera subsp. occidentalis (Hooker) Hultén is a synonym sensu FNA Ed. Comm., 1997 of:
Betula occidentalis Hooker, an accepted species name sensu FNA Ed. Comm., 1997.