PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Illustration from Charles Darwin's Orchid book, fig II, page 15, 1862, first edition, John Murray Publishers. On pages 14-16 of "On the various contrivances by which British and foreign orchids are fertilised by insects", Darwin describes and (here) illustrates a simple experiment. Placing a pencil into the British Early Purple Orchid (Orchis mascula) causes a release mechanism to eject a sticky-based pollen carrying structure (pollinia) onto the pencil. It will quickly change structure (30 seconds) and depress so that the pollen bearing sack now faces forward in a position to pollinate the next suitable orchid the pencil visits!.
Model release not required. Property release not required.