I didn't even have a country of origin for this one when I posted this. If I remember it was given me and all that was obvious was that it belonged to the genus Trichosalpinx, a genus of plants related to Pleurothallis. Since posting the pictures, however, the species has been identified by Wiel Driessen with the help of Chad Lees, who sent him the link. It is Trichosalpinx vasquezii from Bolivia, a very rare species. The flowers are tiny, just a few millimeters, and are held against the bottom of the leaf and are not visible unless the plant is turned upside down. The plant is 15 cm tall.