Hieracium opacum Lönnr. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Hieracium species Hieracium opacum Name Homonyms Hieracium opacum (Lönnr. ex Dahlst.) Johanss. Hieracium opacum Lönnr. ex Dahlst., 1894 Hieracium opacum Lönnr.