Nepenthes stenophylla /nɪˈpɛnθiːz ˌstɛnoʊˈfɪlə/, or the narrow-leaved pitcher-plant,[5] is a tropical pitcher plant endemic to Borneo and occurs at elevations of 900–2,100 m (3,000–7,000 ft).

However, the original description of N. stenophylla was based on a plant raised from seed in a greenhouse in England, and the narrow shape of the lid could be an aberrant characteristic resulting from artificial growing conditions.

[6] In his seminal monograph "The Nepenthaceae of the Netherlands Indies", B. H. Danser treated N. fallax as a heterotypic synonym of N.

[6][7][10][11] Jan Schlauer, however, considers the taxa as two separate species based on the shape of the lid.

[14] Nepenthes fallax has a separate conservation status of Vulnerable on the IUCN Red List.