Equisetum hyemale f. polystachyum Prag. Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Polypodiopsida order Equisetales family Equisetaceae genus Equisetum species Equisetum ferrissii Name Homonyms Equisetum hyemale f. polystachyum Prag. ex Gilbert, 1901 Equisetum hyemale var. polystachyum (Thore ex Milde) Dosch & J.Scriba Equisetum hyemale f. polystachyum Prag. ex A.A.Eaton Equisetum hyemale f. polystachyum Prag. Equisetum hyemale f. polystachyum (Prager ex Gilbert) Scoggan, 1978