Potamogeton densus var. oppositifolius DC. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Liliopsida order Alismatales family Potamogetonaceae genus Groenlandia species Groenlandia densa Name Homonyms Potamogeton densus f. oppositifolius (DC.) Rchb. Potamogeton densus subsp. oppositifolius (DC.) Bonnier & Layens Potamogeton densus var. oppositifolius DC. ex Rchb. Potamogeton densus var. oppositifolius DC.