Related Species
Nepenthes pilosa is easily distinguished from most other species in the genus on the basis of its hook-shaped lid appendage. The only other Bornean Nepenthes species with a similarly developed appendage are N. burbidgeae and N. chaniana.
B. H. Danser suggested that N. pilosa is most closely related to N. burbidgeae and, prior to the rediscovery of wild populations of N. pilosa, the species was considered a possible heterotypic synonym of N. burbidgeae by some authors. N. pilosa differs in having a more prominent and extensive indumentum.
Compared to N. chaniana, the pitchers of N. pilosa are more cylindrical, squater, and not as laterally-compressed.
Nepenthes glandulifera has a similarly extensive indumentum, but lacks a well-developed lid appendage and bears many prominent extrafloral nectaries.
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