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From Latin labellum (“small tub or basin”), diminutive of labrum (“basin, tub”), from lavō (“bathe”).
Latin diminutive of labrum lip leb- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
So different is it that it receives a distinct name, that of the "lip" or "labellum."
The letter L indicates the position of the labellum; the large figures indicate the developed stamens; the italic figures show the position of the suppressed stamens.
Sometimes the twisting of a part makes a change in the position of other parts, as in Orchids, where the twisting of the ovary changes the position of the labellum.
In some corollas the two lips become hollowed out in a remarkable manner, as in calceolaria, assuming a slipper-like appearance, similar to what occurs in the labellum of some orchids, as Cypripedium.
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