Betula papyrifera f. occidentalis (Hook.) H.F.Lewis Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Fagales family Betulaceae genus Betula species Betula occidentalis Name Homonyms Betula papyrifera var. occidentalis (Hook.) Sarg. Betula papyrifera f. occidentalis (Hook.) H.F.Lewis Betula papyrifera subsp. occidentalis (Hook.) Hultén