Calamagrostis americana (Vasey) Scribn. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Poaceae genus Calamagrostis species Calamagrostis inexpansa Name Homonyms Calamagrostis americana (Vasey) Rydb. & Shear Calamagrostis americana (Vasey) Scribn.