zannichellia : Idioms & Phrases
genus zannichellia
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noun horned pondweed: completely submerged herbs; in some classifications included in Potamogetonaceae
Zannichellia.
WordNet
zannichellia palustris
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noun found in still or slow-moving fresh or brackish water; useful to oxygenate cool water ponds and aquaria
horned pondweed.