Flower characteristics are mainly to attract pollinators. Important and noticeable features include colouration of sepals and petals, position of the lip and odour (only in a few species).
However, many orchid species have evolved to great extent in having hidden or unnoticeable features (to human eyes) like colour patterns/spots on its anther cap and base of the lip to allure the pollinators deep inside the flowers to make effective pollination.
Post 46 – 05/January/2021.