watermeal

Noun
  1. Any of various aquatic plants of the genus Wolffia;
    Throughout warmer regions of the world (synset 111816474)
    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
    subtypes: common wolffia, wolffia columbiana - smallest flowering plants known; of the Americas
    belongs to: genus wolffia, wolffia - minute rootless aquatic herbs having globular fronds floating on or near the water surface and bearing one flower per frond

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