Nepenthes junghuhnii (; after Friedrich Franz Wilhelm Junghuhn, who collected it between 1840 and 1842) is a tropical pitcher plant native to Sumatra. This species has been the source of much confusion since its discovery. The taxon originally named N. junghuhnii by John Muirhead Macfarlane has never been formally published (Henry Nicholas Ridley's N. junghuhnii is a heterotypic synonym of N. singalana). In 1994, taxonomist Jan Schlauer described N. junghuhnii as a "rather dubious species based on insufficient specimens". Nepenthes junghuhnii sensu Macfarlane has not been relocated in the wild since the collection of the type specimen. It is characterised by strongly petiolate leaves and appears to be most closely related to N. bongso and N. spathulata; Schlauer considers it a possible synonym of the former. Herbarium specimens informally named N. junghuhnii by Macfarlane were collected by Junghuhn in the Batak region of North Sumatra, near Lake Toba. The specimens of N. singalana that Ridley used to describe N. junghuhnii originated from a collection by Harold Ernest Robinson and Cecil Boden Kloss on Mount Kerinci, in the Sumatran province of Jambi. In his 1928 monograph, "The Nepenthaceae of the Netherlands Indies", B. H. Danser wrote of this taxon: N. Junghuhnii is based upon plants, collected by Junghuhn in Sumatra, named as such by Macfarlane in the Kew Herbarium and seen by Ridley, and with which the latter author identified specimens from G. Kerintji. I have not seen any of these plants and therefore I am not quite certain about them; however, in H. B. there are other plants, collected by Junghuhn in Sumatra and named N. Junghuhnii by Macfarlane, and it seems evident, that these plants may be identical with those in the Kew Herbarium. About the specimens from G. Kerintji, which, according to Ridley, are "undoubtedly the same species", I dare, of course, not say the same. However, the two numbers in H. B. named by Macfarlane seem to be not wholly identical. The first of the above mentioned plants is a form, certainly intermediate between N. sanguinea and N. singalana. The coarse stems and the large leaves are those of N. sanguinea, the pitchers are smaller than usually are those of N. sanguinea, their shape approaches that of the pitchers of N. singalana and the inflorescences are quite like those of the latter species. The second plant mentioned above is perhaps a piece of an identical plant, though