Hieracium porrigens subsp. opacum Lönnr. Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Hieracium species Hieracium opacum Name Homonyms Hieracium porrigens subsp. opacum Lönnr. ex Dahlst. Hieracium porrigens subsp. opacum Lönnr.