My guess is it is a vanilla.

I've searched the web and didn't see too many with purple flowers. Do they all produce the vanilla bean? Is that were the vanilla bean comes from? The look like they can get pretty big..invasive...

Vanilla planifolia bears the vanilla bean (seed pod). It will climb as high as you allow it, but I have seen it grow in pots. Mine bloomed for the first time last month. I have been growing it for 15 years in St. Croix, U.S. Virgin Islands! We may have succeeded in pollinating one flower.

They do get big. They are climbers. I think the flower is white or yellow. I think the one you have is used in commercial production. They all produce a bean. The flowers are open for a short time. A few hours. But there is another flower in sequence to step up. If you are thinking of harvesting beans think again. There is a very laborious process to finally have a bean. They make a nice plant and not invasive. If you have a tree That is bright under the tree with not much direct sun, train your orchid on the tree. I intend to add one to my avocado tree. Now it is in a pot. I want it as large as the pot will allow, then move it to the tree...

I'm traveling with no keyboard, so will do an abbreviated version of this. looks like vanilla. the vanilla bean only develops when flower is successfully pollinated. There is a definite trick to that. The stigma is well hidden. Plant is not invasive, but is a climber. Can be grown and bloomed in a large pot, but be careful because it is as much at home growing as terrestrial as it is an epiphyte. it will grow roots out the drains of the pot and anchor itself to the spot before you know it. making vanilla from the beans requires many beans and a long complicated sun curing process. Plants bloom best from pendant canes. put a totem in the pot and train plant to that...when plant reaches the top, let it "fall over" and grow down. when it reaches the potting material in the pot, train it to grow back up the totem. Mature vines will bloom from the vine growing down. Likes a bright spot (Cattleya conditions) Blooms are greenish yellow.

Bill

Mine have been flowering for years, very definitely not purple flowers.

I have quite a lot of them, they propagate very well from cuttings (pieces of broken off vine). But they will grow very tall if they have something to climb. Some of mine are up over 20 metres high in trees. You never see those flower, especially because the colour blends in with the leaves at a distance.

Pollination is by a very specific insect where they originally come from. That's why they have to be hand pollinated in most places they're artificilaly cultivated.