Yet another plant id

[kingearwig]

Here's another one I found here in North West Indiana. Any idea?
http://i159.photobucket.com/albums/t121/kingearwig/invert%20bowl/DSC01483.jpg

I was lucky enough to find 2 of them here is the other.
http://i159.photobucket.com/albums/t121/kingearwig/new%20aquarium/12%2011%202008/DSC01490-1.jpg

http://i159.photobucket.com/albums/t121/kingearwig/new%20aquarium/12%2011%202008/DSC01488-1.jpg
Thanks!

[Inka4040]

watercress?

[kingearwig]

hmm... anyone ever tried growing that in an aquarium before? I found this right in the middle of a stream. in about 5-6 inches of water. It seems like it is growing.

[kingearwig]

no one has any input on growing watercress submerged?