I have several of these popping up in my garden, and they are huge. I
have grown rutabagas and collards in the past, but can't decide which
this is. It looks more like a rutabaga, but it isn't developing a
root.

http://emberts.no-ip.info/stuff/2011...s/DSCF4031.JPG

PS: Are rutabaga greens edible, and good tasting or are they not worth
the effort to pick and cook?