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Term Definition
Non-resupinate Turned 180° in development; e.g., flowers of most orchids in which the lip originates in the uppermost position but twists in such a way that the labellum faces downward at anthesis. Some orchids do not twist, thus the labellum faces up at anthesis. Non-resupinate labellum (= lip). Photo by S. A. Mori.
Resupinate Turned 180° in development; e.g., flowers of the Orchidaceae in which the lip originates in the uppermost position but twists 180° so it facing downward at anthesis. Most orchids have resupinate flowers. Resupinate lip of Epipactis helloborine of orchid. Photo S. A. Mori.