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Note:
The pitcher is produced at the tip of the leaf from an extended mid rib, but not all leaves produced pitcher usually because of environmental conditions such as a lack of light or humidity. The young pitcher has the lid closed and as the body inflates fluids acuminate inside the base. 

The new pitcher has weak walls that harden over a few days and the lid opens. When the pitcher captures insects the lid remains open as its job is to continually attract the insects with the nectar glands at its base and to stop rain from filling the pitcher. 

The inner rim has down pointing teeth and below it has a smooth glandular surface from which the insect can not climb out of. Digestive fluids are found at the base of the pitcher and these absorb the trapped insect.