Holcus rigidus Hochst. ex Seub. Dataset GBIF Backbone Taxonomy Rank SPECIES Published in Fl. Azor. 17. Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Poaceae genus Holcus species Holcus rigidus Name Homonyms Holcus rigidus Hochst. ex Seub. Holcus rigidus Hochst.