Possibly a variety of blassii, I think Bob has a number of varieties of it including a broad leafed one. Flowers that develop submersed usually deteriorate fairly quickly which is a pity because many crypt flowers are spectacular. I had it for a while but it did not do well in my setup. He grows them submersed and emersed and I have seen some of that plant in flower grown emersed and almost a metre high. Can't remember much about the flower other than it was pretty spectacular.