Thank you so much, everyone. It looks like Joey T is it!
I HAD an Joey T. at one time ... up until I decided to "do it right" and took it to the pond store to have it professionally repotted. Well, somehow or other, their dirt clouded my pond and would NOT filter out, and I had to (for the second time that month) COMPLETELY break down my pond. Not only that, but somehow or other, they KILLED my lily, and it never came back. And - dang it ! - I had made them give me all the divisions (I think they try to keep them, to repot and sell) and I had already given all the divisions away, so I was SOL on my Joey T.
Thanks for the info, and I'll follow up and take everyone's advice on a Joey.