Is there any real difference other than the spelling?

Also, I have a Xanthosoma that I got some years back, but I'm not sure exactly if it's a blue taro or not. The leaves emerge on a purple stem, but the stems tend to lighten up as they mature. The petioles are green, as is the veining under the leaf, and the edge of the leaves have a dark margin, as do the edges of the stems where the new leaves emerge. It is in a semi-shady spot, so I'm wondering, maybe is it not getting enough sun?