The guys who control species names are the Royal Horticultural Society in conjunction with Kew Gardens in London. It is all most confusing to most of us but we are told the changes are due to molecular DNA breakdowns which are supposed to determine the "Real and Accurate" plant family derivations. To us mere mortals most of the changes are just not logical - like when the told us that all Odontoglossums are really Oncidiums! Some do the full circle back to original names like some Maxillaria. I have to admit that I have never changed a label on any plant, but I suppose that people into showing must be seen to adhere to the "correct" name of the day.
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