| Noun | 1. | genus Groenlandia - a monocotyledonous genus of the family Potamogetonaceae liliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed family Potamogetonaceae, pondweed family, Potamogetonaceae - plants that grow in ponds and slow streams; sometimes includes family Zosteraceae frog's lettuce - very similar to Potamogeton; of western Africa, Asia, and Europe |