I looked A to Z on the Texas A&M site but could not find this plant. Not saying it is not there, I just could not make the connection.
Three pictures below. Leaves below the surface are slender. Ones floating on top are more roundish.
Not the best pics and more close up would have been better. Leaned as far out over the creek that I could to get them. If need more will take a rake and pull some out so can get better pics.
