Carnivory
The pitcher fluid of N. flava is highly viscous and coats the inner pitcher walls. This is especially true of aerial traps, which must contend with the action of the wind. The sticky inner walls have been observed to trap small flying insects above the surface of the fluid. The prey subsequently slide down into the fluid where they are digested. It has been suggested that the pitchers of this species function not only as pitfall traps but also as flypaper traps. Indeed, this trapping method is employed by the closely related N. inermis, which also produces highly viscous pitcher fluid.
Read more about this topic: Nepenthes Flava