Sorry to bump this thread, but I have to take some responsibility for it, and it was a topic that interested me (and I'm sure Tolkien meant us to think about, considering his love of all things green and growing).
I have just found a note in LotR, Appendix A, Page 1 which says:
Quote:
No likeness remained in Middle-earth of Laurelin the Golden.
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So that's settled.
If a Mod would kindly close this topic, it can slip into oblivion and be used as reference by anybody else who has enough spare time to consider the nature of the flora of Middle-earth.