I thought the same thing until I noticed that it had been buried to a depth above those little roots, as evidenced by the dried dirt up to the level of those little roots. I have never seen natural roots or the root flare look like the pictures show either. I think it was grafted, was grown until the graft was established and then planted way too deep which allowed it time to grow to 4 feet and then dug up and sold. This is what commercial growers do but they don't bury the graft union. The OP said that the guy he got the plant from had a bunch growing in his backyard. This would also explain why the tree is in such a severe state of shock. I think the guy who sold the tree is an amateur trying to make a little extra money and just didn't know not to bury the graft union. I hope it is not grafted as this will help the tree to survive to a small degree but I think it is.I don't think it's grafted. There are small roots above the bend of the root/trunk. I think it's a seedling.
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