The Nepenthaceae of the Netherlands Indies
In his seminal monograph "The Nepenthaceae of the Netherlands Indies", B. H. Danser treated "N. fallax" as a heterotypic synonym of "N. stenophylla". This interpretation has been supported by most subsequent authors. Jan Schlauer, however, considers the taxa as two separate species based on the shape of the lid. He suspects the taxon originally named as "N. stenophylla" may have later been named again as "N. faizaliana".