Agrostis effusa Gray, 1821 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Poaceae genus Apera species Apera spica-venti Name Homonyms Agrostis effusa Spreng. Agrostis effusa Gray, 1821 Agrostis effusa (L.) Lam.