Figure from Charles Darwin's Fertilisation of Orchids and Orchis mascula flowers (from Wikipediam, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license)
Figure 1 from the 1877 edition of Charles Darwin's Fertilisation of Orchids
https://commons.wikimedia.org/wiki/File:Fertilisation_of_Orchids_figure_1X.jpg
