Coryanthes speciosa, but the fragrance is very different. According to Günter Gerlach's website, Coryanthes mastersiana grows together with Coryanthes flava and Coryanthes elegantium in western Colombia and Ecuador.
When a male Euglossine bee scratches the surface of the hypochile in order to obtain liquid fragrance, he slips into the bucket. With his wings drenched, his only escape is to paddle to the rear opening and force his way through the small opening. In doing so, he rubs up against the sticky end of the pollinarium, which ends up attached to his body. At a subsequent Coryanthes the process is repeated, but this time he leaves the pollinia behind on the stigmatic surface of the column.
Coryanthes produce some of the most incredible flowers in the entire orchid family and this year I plan to set more capsules on our plants.