great duckweed

Noun
  1. Cosmopolitan except South America and New Zealand and some oceanic islands (synset 111816049)
    is a type of: duckweed - any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
    belongs to: genus spirodela, spirodela - minute aquatic herbs floating on the water surface consisting of a shiny leaflike frond and 2-21 roots
    same as: spirodela polyrrhiza, water flaxseed

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