When I was looking again through my photo's I noticed that the flowers of U. quelchiii on this mountain did not only differ in color, but also strongly in shape (perhaps also in size).
As hypotized earlier, hybridisation with U. campbelliana is a likely cause for this, although I have only seen U. campbelliana's during the cliimb, were U. quelchii was rare. At the top of the mountain U. quelchii was a relative common flower. The majority of the U. quelchii plants were baring just a single flower at their stalks though at least one plant was having two flowers and a young flower bud.
I have put some of my U. quelchii photo's in a single frame for a good comparison.







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