Isoetes lacustris
Isoetes lacustris, the lake quillwort or Merlin's grass, is a boreal quillwort native on both sides of the northern Atlantic Ocean. Synonyms include Isoetes hieroglyphica. Wikipedia
Scientific name: Isoetes lacustris
Family: Isoetaceae
Higher classification: Isoetes
Rank: Species
Class: Lycopodiopsida
Kingdom: Plantae