Sparganium americanum var. rigidum R.E.Clausen, 1937 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Poales family Typhaceae genus Sparganium species Sparganium americanum Name Homonyms Sparganium americanum var. rigidum R.T.Clausen Sparganium americanum var. rigidum R.E.Clausen, 1937