Betula alba subsp. frutescens Wallr. Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Fagales family Betulaceae genus Betula species Betula pubescens Name Homonyms Betula alba subsp. frutescens Wallr. Betula alba var. frutescens Wallr.