The orchid above is a form of Habenaria Jiaho Yellow Bird. Evidently the color is variable. I photographed it at the monthly orchid society meeting this week.
There were also a few Catasetinae with dark flowers. The darkest was the multigeneric hybrid Monnierara Millennium Magic “Witchcraft”, above, which is such a deep burgundy-maroon that it can be called black. The flowers were just starting to open when I took the picture, and they ought to be flatter when fully open. (It’s a recent hybrid, and probably not the source of Basil St. John’s black orchid serum. My best guess is that his orchid was an obscure Dendrobium.)
There are many more pictures from the meeting here.