They cling to the labellum, and by depressing it open up the entrance to the flower.
In Orchidaceæ entire absence of the labellum, frequently without any other perceptible change, is of common occurrence.
In a similar way the petals and labellum of Odontoglossum Uro-Skinneri have been found reduced to filamentous processes.
Accordingly the first impression would be that the labellum is here transformed into a sterile stamen.
The ovaries in many cases were not twisted, so that the labellum was consequently uppermost.
The tube is not large, but it, and also the labellum, could not be darker if still to be classed as crimson.
The blossom is normal as to the proper perianth, except that the labellum is unusually papillose, bearded almost to the base.
On either side the dark central line of the labellum is a pale blur.
Moreover, when the stamens are petalodic, the form assumed is usually that of the labellum.
labellum all evenly crimson with a narrow outline of white, gracefully frilled.