On the subject of whether it is in fact emersed downoi or not, Florida Aquatic says it is.
Perhaps the level of humidity affects the shape of the plant? Some of the leaves are elongated and have a bit of a ruffle similar to that of downoi.
At any rate, we shall see over the course of the next few weeks. If it does in fact convert to the submerged conditions and is the plant I want, it was a great deal. There were a ton of stems in those pots!
Random picture of Rupert:
