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Tough to tell - opposite leaves is a big clue - omits some pondweed genus - (pondweed is a very general name for many genus and even families). I found a website - http://www.chesapeakebay.net/bfg_widgeon_grass.aspx?menuitem=14363 either Ruppia maritime, Widgeon Grass or Zannichellia palustris Horned Pondweed. Sago pondweed is alternated leaved along with Potamogeton genus so they are omitted. Hopeful someone else could help you accurate id it.
if you really want to avoid adding the software to your computer, you can enter the website into google, and when it lists it under the search box, click the link that says "view as html." this will let you view the text, although the formatting may be distorted. No pictures will come through, nor will any text that has been converted to pictures, like big headlines/titles, or fancy block capitals at the beginning of an article.