Salix retusa var. angustuifolia L.Thomas Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Malpighiales family Salicaceae genus Salix species Salix retusa Name Homonyms Salix retusa var. angustuifolia L.Thomas Salix retusa var. angustuifolia L.Thomas ex Ser.