#pondweed  any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae
  supertype:  #aquatic_plant__aquaticplant__water_plant__waterplant__hydrophyte__hydrophytic_plant__hydrophyticplant  a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
  member of:  #family_Potamogetonaceae
  subtype:  #curleyleaf_pondweed__curled_pondweed__Potamogeton_crispus  European herb naturalized in the eastern United States and California
  subtype:  #variously-leaved_pondweed__Potamogeton_gramineous  of Europe (except the Mediterranean area) and the northern United States
  subtype:  #loddon_pondweed__Potamogeton_nodosus__Potamogeton_americanus  pondweed with floating leaves; of northern United States and Europe
  subtype:  #frog's_lettuce  very similar to Potamogeton; of western Africa, Asia, and Europe
  subtype:  #horned_pondweed__Zannichellia_palustris  found in still or slow-moving fresh or brackish water; useful to oxygenate cool water ponds and aquaria

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