Nepenthes stenophylla, or the narrow-leaved pitcher-plant, is a tropical pitcher plant endemic to Borneo. The species produces attractive funnel-shaped pitchers up to 25 cm high. It is listed as Least Concern on the IUCN Red List. Nepenthes stenophylla belongs to the loosely defined "N. maxima complex", which also includes, among other species, N. boschiana, N. chaniana, N. epiphytica, N. eymae, N. faizaliana, N. fusca, N. klossii, N. maxima, N. platychila, and N. vogelii.
Nepenthes klossii is a tropical pitcher plant endemic to New Guinea.
Nepenthes faizaliana is a tropical pitcher plant endemic to the limestone cliffs of Gunung Mulu National Park in Sarawak, Borneo. It is thought to be most closely related to N. boschiana.
Nepenthes angasanensis is a tropical pitcher plant species endemic to Sumatra, where it grows at an altitude of 1,400 metres (4,600 ft) to 3,100 metres (10,200 ft) above sea level. The status of this taxon is controversial as it is similar in morphology to N. mikei and N. tobaica. It has even been suggested that the taxon might represent a natural hybrid between N. densiflora and N. tobaica.
Nepenthes vogelii is a tropical pitcher plant endemic to Borneo. It is thought to be most closely related to N. fusca.
Nepenthes gymnamphora is a tropical pitcher plant native to the Indonesian islands of Java and Sumatra. It has a wide altitudinal range of 600–2,800 metres (2,000–9,200 ft) above sea level. There is much debate surrounding the taxonomic status of this species and the taxa N. pectinata and N. xiphioides.
Nepenthes mikei is a tropical pitcher plant endemic to Sumatra. It is characterised by its black mottled lower and upper pitchers. The species is closely related to N. angasanensis and N. tobaica.
Nepenthes diatas is a tropical pitcher plant endemic to Sumatra, where it grows at an altitude of 2,000–2,900 metres (6,600–9,500 ft) above sea level.
"The Nepenthaceae of the Netherlands Indies" is a seminal monograph by B. H. Danser on the tropical pitcher plants of the Dutch East Indies and surrounding regions. It was originally published in the Bulletin du Jardin Botanique de Buitenzorg in 1928, and reprinted by Natural History Publications (Borneo) in 2006.
Nepenthes of Sumatra and Peninsular Malaysia is a monograph by Charles Clarke on the tropical pitcher plants of Sumatra, Peninsular Malaysia, and their minor surrounding islands. It was published in 2001 by Natural History Publications (Borneo). Clarke described it as "intermediate between an ecological monograph and a taxonomic one".
"A skeletal revision of Nepenthes (Nepenthaceae)" is a monograph by Matthew Jebb and Martin Cheek on the tropical pitcher plants of the genus Nepenthes. It was published in the May 1997 issue of the botanical journal Blumea. The work represented the first revision of the entire genus since John Muirhead Macfarlane's 1908 monograph. Jebb and Cheek's revision was based on "collaborative work by both authors since 1984, largely on herbarium specimens, but including fieldwork in New Guinea, Indonesia, Malaysia, Singapore and Madagascar". It was a precursor to their more exhaustive 2001 monograph, "Nepenthaceae".
Nepenthes of Borneo is a monograph by Charles Clarke on the tropical pitcher plants of Borneo. It was first published in 1997 by Natural History Publications (Borneo), and reprinted in 2006. Clarke describes it as "primarily an ecological monograph".
Pitcher Plants of the Old World is a two-volume monograph by Stewart McPherson on the pitcher plants of the genera Nepenthes and Cephalotus. It was published in May 2009 by Redfern Natural History Productions and covers all species known at the time. The work was edited by Alastair Robinson and Andreas Fleischmann.
Pitcher-Plants of Borneo is a monograph by Anthea Phillipps and Anthony Lamb on the tropical pitcher plants of Borneo. It was first published in 1996 by Natural History Publications (Borneo), in association with the Royal Botanic Gardens, Kew and the Malaysian Nature Society. An updated and much expanded second edition was published in 2008 as Pitcher Plants of Borneo, with Ch'ien Lee as co-author.
"Nepenthaceae" is a monograph by John Muirhead Macfarlane on the tropical pitcher plants of the genus Nepenthes. It was published in 1908 in Adolf Engler's Das Pflanzenreich. It was the most exhaustive revision of the genus up to that point, covering all known species, and included detailed accounts of the structure, anatomy, and development of Nepenthes.
Nepenthes of Mount Kinabalu is a monograph by Shigeo Kurata on the tropical pitcher plants of Mount Kinabalu and the surrounding area of Kinabalu National Park in Sabah, Borneo. It was published in 1976 by Sabah National Parks Trustees as the second booklet of the Sabah National Parks series. The monograph is Kurata's most important work on Nepenthes and significantly contributed to popular interest in these plants. It is noted for its high quality colour photographs of plants in habitat. In the book's preface, Kurata writes:
While Nepenthes were often enumerated as an important component of the flora of this mountain, a book on this genus—relating exclusively to Kinabalu had never been published to this date. With such a situation and the interest shown by visitors to the Kinabalu National Park in the genus, Mr. D.V. Jenkins, Assistant Director, Sabah National Parks was prompted to publish a guide book on the species found within the park and I was delighted to be asked to write the text.
"Nepenthaceae" is a monograph by Joseph Dalton Hooker on the tropical pitcher plants of the genus Nepenthes. It was published in 1873 in the seventeenth and final volume of Augustin Pyramus de Candolle's Prodromus Systematis Naturalis Regni Vegetabilis, which was edited by Augustin's son, Alphonse. The monograph focused primarily on new discoveries from northern Borneo. Unlike most major works on Nepenthes, it included no illustrations.
