Nepenthes plants are either male or female. The only way to tell them apart is by the flowers. This picture shows a male plant.
The green arrow points to anthers containing ripe pollen.
The red arrow points to the narrow column between the anthers and the sepals.
This pictures shows a female flower. The green arrow points to the stigmatic surface. The red arrow shows the slightly swollen ovary, characteristic of an unpollenated female flower.

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