Related Species
Nepenthes northiana is very similar to N. mapuluensis, a species known from only a handful of limestone peaks in East Kalimantan, on the other side of Borneo. Although there are few morphological characters separating these two taxa, there seem to be several stable differences that can be used to distinguish between them. Compared to N. northiana, the leaves on the climbing stems of N. mapuluensis are more linear, the pitchers darker in colour, and the upper pitchers narrower. It is also worth noting that N. northiana is known only from the Bau area of Sarawak, which lies several hundred kilometres away from the only known populations of N. mapuluensis.
Nepenthes northiana has also been compared to N. macrovulgaris. The two species have a similarly shaped lamina and petiole, but N. northiana differs in that the climbing stem can be triangular in cross section, as opposed to strictly cylindrical in N. macrovulgaris. In addition, the latter species does not have decurrent leaf bases.
Nepenthes hurrelliana and N. veitchii are superficially similar to N. northiana, but both of these species are smaller and less vividly coloured.
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