Groenlandia is a monotypic genus of aquatic plants (pondweed) of the family Potamogetonaceae. The only species in the genus is Groenlandia densa. Opposite-leaved pondweed is a common name for this plant.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0