From our studies we concluded to describe five new taxa of Nepenthaceae including four new species. From the Lake Toba region in North Sumatra we describe a new species, which is closely related to Nepenthes carunculata, but differs in some morphological features that justify the establishment of a new taxon. Two new species related to Nepenthes dubio and Nepenthes inermis, and one, which is related to Nepenthe rafflesiana and Nepenthes sumatrana, all from West Sumatra are dscribed. From our studies on Nepenthes carunculata at different locations we further decided to describe a new variety.