The whole goji berry business is bedevilled by two different plants both having a common name of "wolfberry": Lycium barbarum and L. chinense. It is a solanaceae.
We grew barbarum for 25 years and never once saw a berry on it. Maybe birds got there first, but I think it may just have been a bit too wet and cold for success.
There is a pretty comprehensive account of wolfberry in Wikipedia.
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