The person who brought the plant would of course be the best source of info, but if she doesn't know, it looks to me a lot like Aliceara (Beallara) Tahoma Glacier. (Oncidium tribe intergeneric)
Everything had a tag when they left my house. It must have been lost somewhere between here and the buyer's home.
Unfortunately, that vendor did not list everything by name on the invoice so I will send this picture to them and see if they will respond with the name.
__________________ May the bridges I've burned light my way.
The two I have that look like this are Beallara Tahoma Glacier and B. Big Shot ‘Hilo sparkle’. One is a descendent of the other and frankly I don’t think I could tell them apart without the label.