I got this from a local (central TX area) pond several months ago. Of the 1gal bag I collected almost all of it completely melted and shed it's leaves by the time I got home. I only put a couple of the best remaining stems in my tank, but they finished their melting and completely disappeared for over a month. Now, all of a sudden in the last week or so I've had 2 stems pop up, (from nowhere near where I actually planted them in the tank of course) and they have grown nearly 30" long and started branching out. Forgot to toss the ruler in the pic, but those stems between the leaf nodes are over 1" long for rough size comparison. Any ideas as to what this is?