Carex atrata var. nigra W.Boott Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Cyperaceae genus Carex species Carex parviflora Name Homonyms Carex atrata var. nigra Olney Carex atrata subsp. nigra (Gaudin) Hartm. Carex atrata var. nigra W.Boott Carex atrata var. nigra Gaudin