Related Species
B. H. Danser suggested that N. insignis is related to N. merrilliana from the Philippines. He placed both species in the Insignes clade, the members of which are characterised by coarse stems, large leaves, sparse indumentums, sessile leaves, and lids without appendages.
Nepenthes insignis has also been compared to N. sibuyanensis, another Philippine endemic. It can be distinguished from that species on the basis of a number of morphological features. The former produces two-flowered pedicels, whereas those of N. sibuyanensis are one-flowered. The pitcher mouth of N. insignis is oblique, compared to almost horizontal in the latter. In addition, the peristome of N. sibuyanensis forms a short neck, while N. insignis lacks a neck completely. Furthermore, N. insignis has shorter peristome teeth than N. sibuyanensis (1 mm versus 5 mm). The pitchers of N. sibuyanensis also differ in shape, being ovate or slightly infundibulate.
Read more about this topic: Nepenthes Insignis
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