The pollinators land on the lower lip. On the rear part of the lip are two glands that secrete nectar which is collected in small cavities immediately below them. The access to the nectar is very narrow to by the protruding edge of the column and the glands, and will cause the tongue of the bumblebee or bee to tear a membrane that covers the base of the two pollinia. As a result, the bees tongue comes into contact with an adhesive which hardens directly when exposed to the air. When the tongue is retracted the pollinia cling to it. The lip of flowers that is a few day more matured has opened further making access to the nectar gland wider and making the tongue brush past the stigma and deliver the pollen. Such a flower which develops first to release the pollen, and is later adapted to be pollinated is called protandrous.