Galium petraeum Coss. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Rubiaceae genus Galium species Galium cossonianum Name Homonyms Galium petraeum Schur Galium petraeum Coss. & Durieu ex Munby Galium petraeum Coss. ex Batt. Galium petraeum Coss.