Potamogeton densus Schwein. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Hydrocharitaceae genus Elodea species Elodea densa Name Homonyms Potamogeton densus Schwein. ex L.C.Beck Potamogeton densus L. Potamogeton densus Schwein.