1) Hydrocharidaceae 
Hydrocharitaceae is a flowering plant family that includes a number of species of aquatic plant, broadly called the tape-grasses, and includes the well known Canadian waterweed and frogbit. The family includes both fresh and marine aquatics, although of the seventeen species currently recognised only three are marine. They are found throughout the...
the frog`s-bit family of monocotyledonous flowering plants, with 18 genera of submerged and emergent, freshwater and saltwater aquatic herbs, mainly ...
[n] - simple nearly stemless freshwater aquatic plants