Hi P
Here's a link for the native Orchidaceae species of Ark.

Sorry, I don't know of a gallery link. You will probably have to do a search for each one. Does Carl's book have photos of the native Orchids?

Your plant may not be a local native species, Since all Orchid seed are dust-like, it could have arrived as a hitch-hiker with another plant and found the ideal conditions to germinate.
Rb

Here is a link that might be useful: Arkansas Biodiversity - Orchidaceae

Found it! It's habinera repens.

P