Related Species
Nepenthes mapuluensis is very similar to N. northiana and there is some question as to the validity of its species status. 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.
In his Carnivorous Plant Database, taxonomist Jan Schlauer treats N. mapuluensis as a possible synonym of N. northiana.
Read more about this topic: Nepenthes Mapuluensis
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