Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/107

. III. which is thus temporarily imprisoned within the otherwise almost completely closed flower. The labellum

.



. (Copied from Mr. R. D. Fitzgerald's 'Australian Orchids.')

remains shut from half an hour to one hour and a half, and on reopening is again sensitive to a touch. Two membranous shields project on each side of the