Potamogeton purshii Tuck. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Potamogetonaceae genus Potamogeton species Potamogeton epihydrus Name Homonyms Potamogeton purshii Tuck. Potamogeton purshii Tuck. ex Jennison Potamogeton purshii Tuck. ex Asch. & Graebn.