Does not list any member of the family Orchidaceae as being poisonous.

In other locations online you can learn that some are said to cause allergic skin responses. Cypripedium reginia comes to mind.

Elsewhere and even here in our very own archives you can learn Onc.
cebollata is said to be an hallucinogen.

From my point of view all orchids cause the hullucination that you have
unlimited amounts of money and space. However, I don't think you have to eat one to get hullucinogized. I think you just need to see one.