Plant id help - rutabaga or collards?

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/2011/2011_september_garden1/images/DSCF4031.JPG
PS: Are rutabaga greens edible, and good tasting or are they not worth the effort to pick and cook?
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sure looks like collards.
Yes, rutabaga greens are edible just not as nutrient rich as others. Taste will depend on how good a cook you are:)
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