Natural Hybrids
Only one natural hybrid involving N. aristolochioides is known. Nepenthes aristolochioides × N. singalana has been found in dense mossy forest on two ridges of Mount Tujuh, only one of which is populated by N. aristolochioides. It is relatively rare, which suggests that the two species flower at different times of the year. This hybrid is smaller than either of its parent species; the pitchers rarely exceed 5 cm in height. The lower pitchers resemble those of N. talangensis, but differ in having more pronounced peristome teeth. Upper pitchers are infundibular in the lower parts, ovoid in the middle, and cylindrical in the upper parts. This hybrid can be distinguished from N. aristolochioides on the basis of its narrow, cylindrical peristome and oblique mouth, as opposed to almost vertical in the latter.
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