Paph. victoria-reginae and chamberlainianum were both "described" in consecutive issues of Gardener's Chronicles ib advertisements by Sanders for an incoming shipment of plants to be auctioned. He had not seen the plants or flowers in person. It has been surmised that it became politically expedient for him to name a plant after Chamberlain, so he named the same plant twice and then just stated that the first plants died in transit. If this is true then the first naming, V-R stands as correct. I far prefer chamberlainianum, and felt that assuming Sanders did this without hard evidence simply based on his history of similar deceits was improper and chamberlainianum should stand. The last time I saw Phil Cribb I made this case, and he said he too preferred chamberlainianum, but that they had evidence in Sanders archived letters and journals written by Sanders himself that he had one plant and two names. As a result V-R stands as the first description (advertisements such as this were grandfathered in as valid descriptions when the code of botanical nomenclature was formalized). As far as I know no credible (and even some incredible and uncredible) taxonomist believes that the two names are anything but synonyms. Why the registrar still accepts both is a puzzle, I pointed this out to the previous registrar ten years ago.