First Planted Aquarium Pic Update

Are you sure that's a peace lily? The leaves don't look ANYTHING like what I've found online... At the store it was labeled as some kind of anubias, it's doing REALLY well thus far
 
It looks like a spathiphyllum to me. May just be the picture. Does it grow on a horizontal rhizome or does it have conventional roots?
 
AquariaCentral.com