Interesting. I hope you guys can dig it up. As a matter a fact, I think I have seen some kind of hairgrass growing in the same lake as the Najas(forgot the name). It was clinging to the rocks, and to my best recollections, used runners to spread. It was a little to numerous and looked toounimpressive for me to try to take home though.
Quite close. However, the Marsilea is still quite sparse.
I remember one lake I went to had loads of it. It grew like groudcover in water 3-12 inches deep. Not to send you on a wild goose chase, but the name could have been Lost Lake, or something else. Quite close to Fresno CA.