I did an ask.com search for duck'sfoot after I thought I had some growing, and believe me that you will know if you have a ducksfoot plant. The leaves are webbed, and they are actually kind of shiny, giving the plant an appearance of not being real. It's kind of a funny looking plant, but if you go on ask.com and search for duck'sfoot you'll come upon Wallyduck. I don't know if they still sell the seeds, but they are still around I think.
~Metalchick