Hieracium griseum Zahn. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Hieracium species Hieracium rydbergii Name Homonyms Hieracium griseum Formánek Hieracium griseum Zahn. Hieracium griseum Rydb., 1900 Hieracium griseum (Norrl.) Norrl.