Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/89

. II. of the pollinia by insects, including the movement of depression, are as perfect as in the species which depend upon insect aid." Hence there can be little doubt that this species is occasionally cross-fertilised.

.



.

Habenaria or Platanthera chlorantha.—The pollinia of the Large Butterfly Orchis differ considerably from those of any species hitherto mentioned. The two