Stipa pennata var. tirsa (Steven) Novák Dataset GBIF Backbone Taxonomy Rank VARIETY Published in Preslia 2: 80 (1923) Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Poaceae genus Stipa species Stipa tirsa Name Homonyms Stipa pennata var. tirsa (Steven) Novák Stipa pennata subsp. tirsa (Steven) K.Richt. Stipa pennata subsp. tirsa (Steven) Kneuck. Stipa pennata var. tirsa (Steven) Celak.