Is there a site out there that identifies aquatic vegetation with pictures?  I would like to have a link for quick reference because im trying to come up with symbols for my pond maps and im probably misidentifying the plants in some cases

I mainly use these three sites.

http://aquaplant.tamu.edu/database/index.htm

http://msucares.com/wildfish/fisheries/farmpond/weeds/thumbs.html

http://www.mciap.org/herbarium/index.php

'>www.cornwallwildlifetrust.org.uk/educate/pondpack/plants1.htm

www.fws.gov/chesapeakebay/savpage.htm

www.pondlifestyles.com/do_it_natural/plants.html

thank you very much