labellum

Harrisoniae in colour and size of sepal and petal; in general shape and in the hues of the labellum after L. purpurata.

Certainly, if I may trust the vessels, the simple labellum of Gymnadenia consists of three organs soldered together.

My case of the Aceras with the aborted labellum squeezed against stigma supports your view.

I am still more pleased that I was right about insects gnawing the fleshy labellum.

This is important, as it explains all the astounding projections on the labellum of Oncidium, Phalaenopsis, etc.