Related Species
Nepenthes faizaliana belongs to the loosely defined "N. maxima complex", which also includes, among other species, N. boschiana, N. chaniana, N. epiphytica, N. eymae, N. fusca, N. klossii, N. maxima, N. platychila, N. stenophylla, and N. vogelii.
Nepenthes faizaliana appears to be most closely related to N. boschiana. These two species differ in the extent of their indumentums; that of N. faizaliana is well developed and conspicuous, while mature plants of N. boschiana are virtually glabrous. In addition, the lower pitchers of N. boschiana tend to have a more bulbous base and a wider peristome. The upper pitchers are hard to distinguish, although those of N. boschiana usually have a wider mouth. Charles Clarke writes that these differences are "not major" and that "closer comparisons seem warranted". Nepenthes boschiana and N. faizaliana are both limestone endemics and occur on the highest limestone formations in Borneo: the Meratus Range and the cliffs of Gunung Mulu National Park, respectively.
Nepenthes faizaliana is also similar to N. stenophylla, with which it was once synonymised. It differs from that species in having more lanceolate leaves, larger inflorescences, as well as a wider, more colourful and less recurved peristome. The flowers of N. faizaliana are borne singly on bracteate pedicels rather than on two-flowered partial peduncles. In addition, the glandular crest of N. faizaliana differs in shape and its lower pitchers are generally bulbous in the lower parts, unlike those of N. stenophylla. Some authors treat N. fallax in synonymy with N. stenophylla, while others consider them to be two distinct species, with plants commonly referred to as N. stenophylla actually representing N. fallax.
Nepenthes faizaliana also bears a resemblance to N. fusca. In their description of the former, Adam and Wilcock distinguished these taxa on the basis of inflorescence structure, the size of the glandular region on the inner surface of upper pitchers, and the development and characteristics of the indumentum. In addition, N. faizaliana differs in having an orbicular pitcher lid, as opposed to the very narrow lid of N. fusca.
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