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Originally posted by Hoosier Hunter:
I think it's a relative tho. Maybe it's Potamogeton diversifolius.

http://aquat1.ifas.ufl.edu/potdiv.html
aka variable leaf pondweed or waterthread pondweed?
http://plants.usda.gov/java/profile?symbol=PODI
http://plants.usda.gov/java/county?state_name=Indiana&statefips=18&symbol=PODI