Iluvia de Oro
Yay! I’ve identified a Costa Rican orchid!
Oncidium stenotis
And it even has a common name, Iluvia de Oro, or Golden Iluvia as my faithful translater, Babelfish, renders it.
Now, having made this tentative ID, I’m sure someone is going to contradict me. And that’s OK, I can take it.