Nepenthes aenigma is a tropical pitcher plant known from two mountains in Ilocos Norte province on the Philippine island of Luzon, where it grows at an elevation of around 1200 m above sea level. The species is notable for growing among dense vegetation in deep shade. It shows similarities to N. burkei and N. ventricosa.
The species was originally discovered in April 2002 by ornithologist Herman Nuytemans and was only relocated in the wild just over 10 years later. Prior to its formal description the species was known under the placeholder name "Nepenthes sp. Luzon".
- Gronemeyer, T., W. Suarez, H. Nuytemans, M. Calaramo, A. Wistuba, F.S. Mey & V.B. Amoroso (2016). Two new Nepenthes species from the Philippines and an emended description of Nepenthes ramos. Plants 5(2): 23. doi:10.3390/plants5020023
- McPherson, S.R. (2011). Discovery of an incompletely diagnosed pitcher plant from Luzon. In: New Nepenthes: Volume One. Redfern Natural History Productions, Poole. pp. 457–459.
- Suarez, W. (2013). The rediscovery of Nepenthes sp. Luzon. Carnivorous Plants in the tropics, 18 April 2013.
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