horned pondweed

Noun
  1. Found in still or slow-moving fresh or brackish water;
    Useful to oxygenate cool water ponds and aquaria (synset 112638907)
    is a type of: pondweed - any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae
    same as: zannichellia palustris

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