Stipa diffusa Willd. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Poaceae genus Piptochaetium species Piptochaetium avenaceum Name Homonyms Stipa diffusa Willd. ex Steud. Stipa diffusa Walter Stipa diffusa Willd.