My Jamaican gardeners have planted something they call Callaloo in my
garden. The Wikipedia article lists a number of plants that are used for
Callaloo but none of them are an exact match for this plant,

http://picasaweb.google.com/bjoshuarosen/Callaloo#

I think it looks like taro but my gardeners don't think so. They brought
the seeds from Jamaica where it's grown commercially so chances are that
this is safe. However these are the same guys who said that pokeweed was
edible so I'm not going to touch this stuff until I know what it is.
Please help identify this.