Potamogeton densus f. setaceus (L.) Nyman Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Potamogetonaceae genus Groenlandia species Groenlandia densa Name Homonyms Potamogeton densus var. setaceus (L.) Nyman Potamogeton densus subsp. setaceus (L.) K.Richt. Potamogeton densus f. setaceus (L.) Rchb.