Potamogeton spathiformis Tuck. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Potamogetonaceae genus Potamogeton species Potamogeton gramineus Name Homonyms Potamogeton spathiformis Tuck. ex A.Gray Potamogeton spathiformis Tuck.