Related Species
Nepenthes beccariana is closely related to N. longifolia and N. sumatrana, and may be conspecific with the former. The extent of the variation in N. beccariana and N. longifolia is unknown, making them difficult to circumscribe. Observations of N. beccariana at the type locality would need to be carried out to resolve this taxonomic confusion.
Despite sharing a number of morphological features with N. sumatrana, N. beccariana is difficult to confuse with this species. Nepenthes sumatrana is distinguished by its infundibular upper pitchers (versus cylindrical in N. beccariana), which have a raised section at the front of the peristome. In addition, the ovoid lower pitchers of N. sumatrana have orbicular lids, as opposed to the ovate operculum of N. beccariana.
The unidentified taxon (N. cf. beccariana) that grows along the road from Sibolga to Tarutung is similar to N. longifolia, but is atypical of the species. It differs from the type form of N. longifolia in that the petioles are not decurrent into a pair of wings over the internodes and some of the hairs lining the leaf margins are caducous. The plants also differ in ecology; the unidentified taxon grows in both exposed sites and amongst dense vegetation, while N. longifolia is generally found in dense forest.
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