ribbonweed

noun6

1. •
   Species of Posidonia
2. •
   Ribbonleaf pondweed, Potamogeton epihydrus
3. •
   Stuckenia pectinata (Potamogeton pectinatus)
4. •
   Species of Vallisneria
5. •
   Any of various marine and freshwater flowering plants.
6. •
   Zostera capricorni