Equisetum laevigatum f. polystachyum A.A.Eaton Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Polypodiopsida order Equisetales family Equisetaceae genus Equisetum species Equisetum laevigatum Name Homonyms Equisetum laevigatum f. polystachyum A.A.Eaton