Ruppia sp.
Family: Ruppiaceae
What it is like
A herb that keeps growing from year to year. It grows in water. The stems are slender and usually branched. The leaves are alternate and narrow.
Also put in the family Potamogetonaceae.
Where it is found
It is a temperate plant. It grows in salty or hard water.
Countries/locations it is found in
North America, USA
How it is used for food
The seeds are made into a meal.