1) Brackish water plant 
Ruppia, also known as the ditch grasses or widgeon grass, is the only genus in the family Ruppiaceae. The genus name was given in honour of Heinrich Bernhard Rupp, a German botanist (1688-1719). They are widespread outside of frigid zones and the tropics. The leaf is simple and non-rhizomatous. They can be annual (commonly) or perennial (rarely); ...