Betula alba f. cordifolia Regel Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Fagales family Betulaceae genus Betula species Betula cordifolia Name Homonyms Betula alba var. cordifolia (Regel) Fernald Betula alba f. cordifolia Regel Betula alba var. cordifolia (Regel) Regel