My favourite section of Hortus Botanicus in Amsterdam is the carnivorous section which is outside, the micro climate in the middle of the city means that the plants survive the snow and low temps of winter here.
Anyway, I thought I had taken images of flowers and young white-topped pitcher plant -Sarracenia leucophylla as that is what the label in the middle of them said

. Now though I see I am wrong.
Last year I saw Purple Pitcher plant's - Sarracenaia purpurea and Yellow pitcher plant - Sarracenia flava in this bed.
Any idea what they are?