Rhymes,
I had to use the latin name caudelfin gave, as Marestail gave me LOTS of results for other species. That's why it's always best to give latin name when possible.
caudel, its possible it might survive if you let part of it grow emersed. If it starts to look like its dying off, remove it before it rots and fouls your water. Let us know how it works out. I could see palaudrum people being interested in this plant, as well as pond people.