Phrag lindenii. It's a weird species, with a third petal instead of a pouch. Wow! The leaves might actually belong to something else, but the flower is unique and unmistakable.
The leaves of the Phragmipedium lindenii are obscured behind the leaves of the Pleurothallid growing in the foreground of the photo. If you enlarge the photo, you will see the Phrag's leaves in the background.
Part of the Phrag's right leaf, (the leaf that is on the left side of the photograph), is yellowing.