Emma,
The terms are unfortunately mixed up. An official 'variety' has been formally described in a scientific journal (= magazine with peer review).
However, many early formally described varieties, were simply color forms, which are no longer considered to be varieties.
There is no single listing with all varieties. I think that some of the orchid database packages will list at least the better known varieties, but I don't think any can be considered 100% complete.
Some of the more important species have a lot of described varieties (Paph insigne has about 100, but not all have been properly published).
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Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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