Eurasian Watermilfoil, Family Haloragaceae is on the texas list as exotic/prohibited. And your pictures do look like it.

http://www.tpwd.state.tx.us/huntwild/wild/species/exotic/prohibited_aquatic.phtml

I would e-mail TPWD with those pictures. Tell them what you think the picture is, tell them where it is and ask them what you need to do.

my hunch is on a private pond they are probably going to tell you need to make sure you dont spread it to public water and that it's your problem to control on your land.

ref: http://www.tpwd.state.tx.us/landwater/water/environconcerns/nuisance_plants/

I have e-mailed TPWD a few times and always received quick and useful responses.


brian