Nepenthes ampullaria

Nepenthes ampullaria
Rosette pitcher of Nepenthes ampullaria from Bako National Park, Borneo
Conservation status
Least Concern  (IUCN 2.3)
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Core eudicots
Order:	Caryophyllales
Family:	Nepenthaceae
Genus:	Nepenthes
Species:	N. ampullaria
Binomial name
Nepenthes ampullaria Jack (1835)
Synonyms
Nepenthes ampullacea Low (1848) sphalm.typogr. Nepenthes ampullaria auct. non Jack: Jeann. (1894) [=N. vieillardii]

Nepenthes ampullaria (/nᵻˈpɛnθiːz ˌæmpʊˈlɛəriə/; Latin: ampulla "flask") is a very distinctive and widespread species of tropical pitcher plant, present in Borneo, the Maluku Islands, New Guinea, Peninsular Malaysia, Singapore, Sumatra, and Thailand.^{[1][2][3][4][5]}

Nepenthes ampullaria, unlike other members of its genus, has evolved away from carnivory and the plants are partly detritivores, collecting and digesting falling leaf litter in their pitchers.^[6][7][8]

In the 1996 book Pitcher-Plants of Borneo, N. ampullaria is given the vernacular name flask-shaped pitcher-plant.^[9] This name, along with all others, was dropped from the much-expanded second edition, published in 2008.^[10]

Description

N. ampullaria with climbing stems and rosette pitchers.

Due to its unique pitcher morphology and unusual growth habit, it is difficult to confuse N. ampullaria with any other species in the genus. Francis Ernest Lloyd translated Troll's 1932 account of this species as follows:^[11]

"I came across N. ampullaria among the massive vegetations of a swamp-forest on the island of Siberut off the west coast of Sumatra. It was a fabulous, unforgettable sight. Everywhere, through the network of lianas the peculiarly-formed pitchers of this species gleamed forth, often in tight clusters and, most remarkably, the muddy moss-overgrown soil was spotted with the pitchers of this plant, so that one got the impression of a carpet."

The stem of N. ampullaria is light brown in colour and may climb to 15 m in height. Leaves are light green, up to 25 cm long, and 6 cm wide. Pitchers are produced at the ends of short tendrils no more than 15 cm long.^[12]

The urceolate pitchers are generally quite small, rarely exceeding 10 cm in height and 7 cm in width. The peristome is greatly incurved, with the inner section accounting for around 85% of its total cross-sectional surface length.^[13] Upper pitchers are very rarely produced and are considerably smaller than those formed on rosettes or offshoots. Pitchers range in colouration from light green throughout to completely dark red, with many intermediate forms recorded. The pitchers of N. ampullaria from Sumatra and Peninsular Malaysia are almost exclusively green throughout or green with red speckles; the red forms are mostly confined to Borneo. A large-pitchered form has been recorded from New Guinea.^[12][14]

The inflorescence of N. ampullaria is a dense panicle. It is the only Nepenthes species recorded from Sumatra or Peninsular Malaysia that produces paniculate inflorescences.^[14]

All parts of the plant are densely covered with short, brown hairs when young. The indumentum of mature plants is more sparse, except on the inflorescenes.^[12]

Distribution and habitat

One of the most widespread Nepenthes species, N. ampullaria is native to Borneo, the Maluku Islands, New Guinea, Peninsular Malaysia, Singapore, Sumatra, and Thailand.^[1] It has also been recorded from many smaller islands, including Bangka, Bengkalis, Ko Lanta, Ko Tarutao, Langkawi, Mendol, Mentawai Islands (Siberut), Meranti Islands (Padang, Rangsang, Tebing Tinggi), Nias, Penang, Riau Islands (Lingga Islands, Natuna Islands,^[15] Riau Archipelago), and Rupat.^[16]

Nepenthes ampullaria generally grows in damp, shady forest from sea-level to 2100 m altitude.^[17] In Borneo, it occurs usually on relatively flat terrain in kerangas forest, peat swamp forest, and degraded swamp forest, at elevations of 0 to 1000 m.^[12]

In Sumatra and Peninsular Malaysia, it grows from sea-level to 1100 m altitude on flat terrain in heath forest, padang (meaning "field" in Malay), belukar, peat swamp forest, degraded swamp forest, and in padi fields.^[14]

In New Guinea, it is predominantly present in Araucaria forests. The species has also been recorded from secondary forests, open microphyllous vegetation, and swamp grassland.^[17]

Carnivory

N. ampullaria is well-adapted to capturing leaf litter.

Nepenthes ampullaria has largely moved away from carnivory and acquires a substantial portion of its nutrients from digesting leaf matter that falls to the forest floor. It is thus partially detritivorous.

The species has developed several unique traits as a consequence of its adaptation to trapping leaf litter:^[14]

• It is one of the few species in the genus to lack "lunate" cells in its pitchers.^[18][19] These are modified stomatal guard cells which, it is thought, deny prey a foothold in the pitcher.^[11]
• The pitcher lid is atypical, being very small and reflexed, such that leaf litter is allowed to fall directly into the pitcher.^[14]
• Nectar glands, which play an important role in prey capture, are very rare and in some cases completely absent from the pitcher lid.^[14]
• The marginal glands of the peristome are greatly reduced compared to those of other species.^[14]
• In terrestrial pitchers, the glandular region extends almost to the peristome, such that there is little or no conductive waxy zone.^{[12][19][20][21][22]} The waxy zone functions by causing prey to slip and fall into the digestive fluid.^[14]
• The plant's architecture, consisting of subsurface runners and offshoots, is unusual for the genus. The species often forms a "carpet" of pitchers covering the soil. This serves to maximise the area over which falling debris may be intercepted.^[14]
• The pitchers of N. ampullaria are relatively long-lived, as the species relies on a slow accumulation of nutrients over time.^[14]
• It is thought that infaunal organisms, such as mosquito larvae, facilitate breakdown of leaf litter and aid in the transfer of nitrogen from it to the plant by means of the excretion of ammonium ions. Bacterial breakdown of leaf matter is also known to produce ammonium ions.^[14]

It has been shown that foliar stable nitrogen isotope (¹⁵N) abundance in N. ampullaria plants growing under forest canopy (litterfall present) is significantly lower than in plants without access to litterfall. Conversely, total nitrogen concentrations are higher in these plants compared to those growing in open sites with no litterfall. A 2003 study estimated that N. ampullaria plants growing under forest canopy derive 35.7% (±0.1%) of their foliar nitrogen from leaf litter.^[6] A 2011 study found that N. ampullaria derives 41.7% (±5.5%) of its laminar nitrogen and 54.8% (±7.0%) of its pitcher nitrogen from leaf litter, and showed that detritivory increased the rate of net photosynthesis in the laminae.^[7]

Pitcher infauna

At least 59 infaunal species have been recorded from the pitchers of N. ampullaria.^[23] Among these are one of the smallest known species of Old World frog, Microhyla nepenthicola, and the crab spider, Misumenops nepenthicola.^[24][25] The bacterial communities found in the pitchers of this species have also been studied.^[26]

Infraspecific taxa

A red form of N. ampullaria

A tiny upper pitcher of N. ampullaria from Sumatra. Such aerial traps are very rarely produced and appear almost vestigial, often being too small to catch prey.^[14]

The most recently described variety, N. ampullaria var. racemosa, occurs in Sarawak and has a racemose inflorescence. B. H. Danser considered the other varieties to be unimportant.^[27] A complete list of published varietal names includes:^[28]

• N. ampullacea var. picta Hort.Parker ex Rafarin (1869)
• N. ampullacea var. vittata Hort.Van Houtte ex Rafarin (1869)
• N. ampullaria var. geelvinkiana Becc. (1886)
• N. ampullaria var. guttata D.Moore (1872)^[29]
• N. ampullaria var. longicarpa Becc. (1886)
• N. ampullaria var. microsepala Macfarl. (1911)
• N. ampullaria var. papuana Becc. in sched. nom.nud.
• N. ampullaria var. racemosa J.H.Adam & Wilcock (1990)
• N. ampullaria var. viridis Hort. ex Teijsm. (1859)^[30] nom.nud.
• N. ampullaria var. vittata-major Mast. (1872)^[31]

Natural hybrids

N. ampullaria flowers once or twice annually for several weeks at a time. Its flowering period often coincides with those of other Nepenthes species; consequently, it readily forms natural hybrids. The following natural hybrids involving N. ampullaria have been recorded.

• N. albomarginata × N. ampullaria^[12]
• N. ampullaria × N. bicalcarata^[12]
• N. ampullaria × N. eustachya^[1]
• N. ampullaria × N. gracilis [=N. × trichocarpa]^[12]
• (N. ampullaria × N. gracilis) × N. bicalcarata [=N. × trichocarpa × N. bicalcarata]
• N. ampullaria × N. hemsleyana^[32]
• N. ampullaria × N. hirsuta^[12]
• N. ampullaria × N. mirabilis [=N. × kuchingensis, Nepenthes cutinensis]^[12]
• N. ampullaria × N. neoguineensis^[1]
• N. ampullaria × N. rafflesiana [=N. × hookeriana]^[12][33]
• ? (N. ampullaria × N. rafflesiana) × N. mirabilis [=N. × hookeriana × N. mirabilis]^[34]
• N. ampullaria × N. reinwardtiana^[14]
• N. ampullaria × N. spathulata^[35]
• N. ampullaria × N. tobaica^[14]

• 
  ? N. ampullaria × N. eustachya
• 
  N. ampullaria × N. gracilis
• 
  N. ampullaria × N. mirabilis
• 
  N. ampullaria × N. neoguineensis
• 
  N. ampullaria × N. rafflesiana

References

1. McPherson, S.R. 2009. Pitcher Plants of the Old World. 2 volumes. Redfern Natural History Productions, Poole.
2. (Italian) Catalano, M. 2010. Nepenthes della Thailandia: Diario di viaggio. Prague.
3. McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Peninsular Malaysia and Indochina. Redfern Natural History Productions, Poole.
4. McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Australia and New Guinea. Redfern Natural History Productions, Poole.
5. McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sumatra and Java. Redfern Natural History Productions, Poole.
6. Moran, J.A., C.M. Clarke & B.J. Hawkins 2003. From carnivore to detritivore? Isotopic evidence for leaf litter utilization by the tropical pitcher plant Nepenthes ampullaria. International Journal of Plant Sciences 164(4): 635–639. doi:10.1086/375422
7. Pavlovič, A., Ľ. Slováková & J. Šantrůček 2011. Nutritional benefit from leaf litter utilization in the pitcher plant Nepenthes ampullaria. Plant, Cell & Environment 34(11): 1865–1873. doi:10.1111/j.1365-3040.2011.02382.x
8. Pavlovič, A. 2012. Adaptive radiation with regard to nutrient sequestration strategies in the carnivorous plants of the genus Nepenthes. Plant Signaling & Behavior 7(2): 295–297. doi:10.4161/psb.18842
9. Phillipps, A. & A. Lamb 1996. Pitcher-Plants of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
10. Phillipps, A., A. Lamb & C.C. Lee 2008. Pitcher Plants of Borneo. Second Edition. Natural History Publications (Borneo), Kota Kinabalu.
11. Lloyd, F.E. 1942. The Carnivorous Plants. Chronica Botanica 9. Ronald Press Company, New York, U.S.A. xvi + 352 pp.
12. Clarke, C.M. 1997. Nepenthes of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
13. Bauer, U., C.J. Clemente, T. Renner & W. Federle 2012. Form follows function: morphological diversification and alternative trapping strategies in carnivorous Nepenthes pitcher plants. Journal of Evolutionary Biology 25(1): 90–102. doi:10.1111/j.1420-9101.2011.02406.x
14. Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
15. (Indonesian) Mansur, M. 2012. Keanekaragaman jenis tumbuhan pemakan serangga dan laju fotosintesisnya di Pulau Natuna. [Diversity on insectivorous plants and its photosynthetic rate in Natuna Island.] Berita Biologi 11(1): 33–42. Abstract
16. Clarke, C.M. 2001. Appendix C: Distribution Maps. In: Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu. pp. 299–307.
17. Jebb, M.H.P. & M.R. Cheek 1997. A skeletal revision of Nepenthes (Nepenthaceae). Blumea 42(1): 1–106.
18. Pant, D.D. & S. Bhatnagar 1977. Morphological studies in Nepenthes (Nepenthaceae). Phytomorphology 27: 13–34.
19. Moran, J.A., B.J. Hawkins, B.E. Gowen & S.L. Robbins 2010. Ion fluxes across the pitcher walls of three Bornean Nepenthes pitcher plant species: flux rates and gland distribution patterns reflect nitrogen sequestration strategies. Journal of Experimental Botany 61(5): 1365–1374. doi:10.1093/jxb/erq004
20. Macfarlane, J.M. 1893. Observations on pitchered insectivorous plants. (Part II.). Annals of Botany 7(4): 403–458.
21. Jebb, M.H.P. 1991. An account of Nepenthes in New Guinea. Science in New Guinea 17(1): 7–54.
22. Di Giusto, B., M. Guéroult, N. Rowe & L. Gaume 2009. Chapter 7: The Waxy Surface in Nepenthes Pitcher Plants: Variability, Adaptive Significance and Developmental Evolution. In: S.N. Gorb (ed.) Functional Surfaces in Biology: Adhesion Related Phenomena. Volume 2. Springer. pp. 183–204.
23. Adlassnig, W., M. Peroutka & T. Lendl 2011. Traps of carnivorous pitcher plants as a habitat: composition of the fluid, biodiversity and mutualistic activities. Annals of Botany 107(2): 181–194. doi:10.1093/aob/mcq238
24. Das, I. & A. Haas. 2010. New species of Microhyla from Sarawak: Old World's smallest frogs crawl out of miniature pitcher plants on Borneo (Amphibia: Anura: Microhylidae). Zootaxa 2571: 37–52.
25. Gururaja, K.V. 2010. Old World’s smallest frog discovered residing in killer plants. Current Science 99(8): 1000.
26. Chou, L.Y., C.M. Clarke & G.A. Dykes 2014. Bacterial communities associated with the pitcher fluids of three Nepenthes (Nepenthaceae) pitcher plant species growing in the wild. Archives of Microbiology 196(10): 709–717. doi:10.1007/s00203-014-1011-1
27. Danser, B.H. 1928. The Nepenthaceae of the Netherlands Indies. Bulletin du Jardin Botanique de Buitenzorg, Série III, 9(3–4): 249–438.
28. Schlauer, J. N.d. Nepenthes ampullaria. Carnivorous Plant Database.
29. Moore, D. 1872. On the culture of Nepenthes at Glasnevin. The Gardeners' Chronicle and Agricultural Gazette 1872(11): 359–360.
30. (French) Teysmann, M.J.E. 1859. Énumération des plantes envoyées de Java au jardin botanique de l'Université de Leide. Annales d'horticulture et de botanique, ou Flore des jardins du royaume des Pays-Bas, et histoire des plantes cultivées les plus intéressantes des possessions néerlandaises aux Indes orientales, de l'Amérique et du Japon 2: 133–142.
31. Masters, M.T. 1872. The cultivated species of Nepenthes. The Gardeners' Chronicle and Agricultural Gazette 1872(16): 540–542.
32. Scharmann, M. & T.U. Grafe 2013. Reinstatement of Nepenthes hemsleyana (Nepenthaceae), an endemic pitcher plant from Borneo, with a discussion of associated Nepenthes taxa. Blumea 58(1): 8–12. doi:10.3767/000651913X668465
33. Yulita, K.S. & M. Mansur 2012. The occurrence of hybrid in Nepenthes hookeriana Lindl. from Central Kalimantan can be detected by RAPD and ISSR markers. HAYATI Journal of Biosciences 19(1): 18–24. doi:10.4308/hjb.19.1.18
34. Lowrie, A. 1983. Sabah Nepenthes Expeditions 1982 & 1983. Carnivorous Plant Newsletter 12(4): 88–95.
35. (Indonesian) Akhriadi, P. 2007. Kajian taksonomi hibrid alami Nepenthes (Nepenthaceae) di Kerinci. Working paper, Andalas University, Padang. Abstract

Further reading

• [Anonymous] 1881. Messrs. Veitch's Nepenthes-house. The Gardeners' Chronicle, new series, 16(410): 598–599.
• [Anonymous] 1883. Mr. A. E. Ratcliff's Nepenthes. The Gardeners' Chronicle 20(497): 18–19.
• Adam, J.H., C.C. Wilcock & M.D. Swaine 1992. The ecology and distribution of Bornean Nepenthes. Journal of Tropical Forest Science 5(1): 13–25.
• Adam, J.H. 1997. Prey spectra of Bornean Nepenthes species (Nepenthaceae) in relation to their habitat. Pertanika Journal of Tropical Agricultural Science 20(2–3): 121–134.
• Adam, J.H. & C.C. Wilcock 1999. Palynological study of Bornean Nepenthes (Nepenthaceae). Pertanika Journal of Tropical Agricultural Science 22(1): 1–7.
• (Malay) Adam, J.H., J.N. Maisarah, A.T.S. Norhafizah, A.H. Hafiza, M.Y. Harun & O.A. Rahim et al. 2009. Ciri Tanih Pada Habitat Nepenthes (Nepenthaceae) di Padang Tujuh, Taman Negeri Endau-Rompin Pahang. [Soil Properties in Nepenthes (Nepenthaceae) Habitat at Padang Tujuh, Endau-Rompin State Park, Pahang.] In: J.H. Adam, G.M. Barzani & S. Zaini (eds.) Bio-Kejuruteraan and Kelestarian Ekosistem. [Bio-Engineering and Sustainable Ecosystem.] Kumpulan Penyelidikan Kesihatan Persekitaran, Pusat Penyelidikan Bukit Fraser and Universiti Kebangsaan, Malaysia. pp. 147–157.
• Adam, J.H., H.A. Hamid, M.A.A. Juhari, S.N.A. Tarmizi & W.M.R. Idris 2011. Species composition and dispersion pattern of pitcher plants recorded from Rantau Abang in Marang District, Terengganu State of Malaysia. International Journal of Botany 7(2): 162–169. doi:10.3923/ijb.2011.162.169
• (French) André, E. 1877. Nepenthes ampullaria, Jack. Nepenthes ampullaria var. vittata major.. L'Illustration horticole: revue mensuelle des serres et des jardins 24: 45–46, t. 272. (alternate scan)
• Anuniwat, A., A. Chaveerach, T. Tanee & R. Sudmoon 2009. Development of SCAR markers for species identification of the genus Nepenthes (Nepenthaceae). Pakistan Journal of Biological Sciences 12(22): 1455–1461. doi:10.3923/pjbs.2009.1455.1461
• (Indonesian) Baloari, G., R. Linda & Mukarlina 2013. Keanekaragaman jenis dan pola distribusi Nepenthes spp di Gunung Semahung Kecamatan Sengah Temila Kabupaten Landak. Protobiont 2(1): 1–6. Abstract
• Beaman, J.H. & C. Anderson 2004. The Plants of Mount Kinabalu: 5. Dicotyledon Families Magnoliaceae to Winteraceae. Natural History Publications (Borneo), Kota Kinabalu.
• (French) Besnard, J. 1991. Nepenthes ampullaria "Cantley's red". Dionée 23.
• Beveridge, N.G.P., C. Rauch, P.J.A. Keßler, R.R. van Vugt & P.C. van Welzen 2013. A new way to identify living species of Nepenthes (Nepenthaceae): more data needed! Carnivorous Plant Newsletter 42(4): 122–128.
• (Latin) Blume, C.L. 1852. Ord. Nepenthaceae. In: Museum Botanicum Lugduno-Batavum, sive stirpium exoticarum novarum vel minus cognitarum ex vivis aut siccis brevis expositio. Tom. II. Nr. 1. E.J. Brill, Lugduni-Batavorum. pp. 5–10.
• Bonhomme, V., H. Pelloux-Prayer, E. Jousselin, Y. Forterre, J.-J. Labat & L. Gaume 2011. Slippery or sticky? Functional diversity in the trapping strategy of Nepenthes carnivorous plants. New Phytologist 191(2): 545–554. doi:10.1111/j.1469-8137.2011.03696.x
• Bourke, G. 2011. The Nepenthes of Mulu National Park. Carniflora Australis 8(1): 20–31.
• Brearley, F.Q. & M. Mansur 2012. Nutrient stoichiometry of Nepenthes species from a Bornean peat swamp forest. Carnivorous Plant Newsletter 41(3): 105–108.
• Burnett, J.B., M. Davies & G. Taylor (eds.) 2003. Flora and Fauna Survey of the Tangguh LNG Site Papua Province, Indonesia. P.T. Hatfindo Prima, Bogor.
• Chung, A.Y.C. 2006. Biodiversity and Conservation of The Meliau Range: A Rain Forest in Sabah's Ultramafic Belt. Natural History Publications (Borneo), Kota Kinabalu. ISBN 9838121169.
• Clarke, C.M.; R. Cantley; J. Nerz; H. Rischer & A. Witsuba (2000). "Nepenthes ampullaria". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 12 May 2006.
• Clarke, C.M. & J.A. Moran 1994. A further record of aerial pitchers in Nepenthes ampullaria Jack. Malayan Nature Journal 47: 321–323.
• Cresswell, J.E. 1998. Morphological correlates of necromass accumulation in the traps of an Eastern tropical pitcher plant, Nepenthes ampullaria Jack, and observations on the pitcher infauna and its reconstitution following experimental removal. Oecologia 113(3): 383–390. doi:10.1007/s004420050390
• Damayanti, F., M. Mansur & I. Roostika 2011. Diversity of Nepenthes spp. in West Kalimantan. International Journal of Biodiversity and Conservation 3(13): 705–708.
• (Indonesian) Desti 2009. Anatomi daun dua jenis kantung semar (Nepenthes ampullaria Jack dan Nepenthes singalana Becc.). Thesis, Andalas University, Padang. Abstract
• (Indonesian) Deswita, E. 2010. Perkembangan ginesium beberapa jenis Nepenthes (N. ampullaria Jack., N. gracilis Korth. dan N. reinwardtiana Miq.). Thesis, Andalas University, Padang. Abstract
• Dixon, W.E. 1889. Nepenthes. The Gardeners' Chronicle, series 3, 6(144): 354.
• (Indonesian) Enjelina, W. 2012. Analisis hibrid alam kantung semar (Nepenthes) di Bukit Taratak Kabupaten Pesisir Selatan Sumatera Barat dengan teknik RAPD. M.Sc. thesis, Andalas University, Padang.
• Fashing, N.J. 2010. Two novel adaptations for dispersal in the mite family Histiostomatidae (Astigmata). In: M.W. Sabelis & J. Bruin (eds.) Trends in Acarology: Proceedings of the 12th International Congress. Springer Science, Dordrecht. pp. 81–84. doi:10.1007/978-90-481-9837-5
• Frazier, C.K. 2000. Reproductive isolating mechanisms and fitness among tropical pitcher plants (Nepenthes) and their hybrids. [video] The 3rd Conference of the International Carnivorous Plant Society, San Francisco, USA.
• Green, T.L. & S. Green 1964. Stem pitchers on Nepenthes ampullaria. Malayan Nature Journal 18: 209–211.
• (Indonesian) Hanafi, H. 2010. Pertumbuhan Nepenthes ampullaria Jack. pada medium MS modifikasi dan penambahan beberapa konsentrasi BAP. Thesis, Andalas University, Padang. Abstract
• (Indonesian) Hanafiah, L. 2008. Studi habitat Nepenthes ampullaria Jack di Kawasan Taman Wisata Alam Lembah Harau. M.Sc. thesis, Andalas University, Padang. Abstract
• (Indonesian) Handayani, T. 1999. Konservasi Nepenthes di kebun raya Indonesia. [Conservation of Nepenthes in Indonesian botanic gardens.] In: A. Mardiastuti, I. Sudirman, K.G. Wiryawan, L.I. Sudirman, M.P. Tampubolon, R. Megia & Y. Lestari (eds.) Prosiding II: Seminar Hasil-Hasil Penelitian Bidang Ilmu Hayat. Pusat Antar Universitas Ilmu Hayat IPB, Bogor. pp. 365–372.
• (Indonesian) Handayani, T. & R. Hendrian 1999. Strategi konservasi Nepenthes ampullaria Jack. [Conservation strategy of Nepenthes ampullaria Jack.] In: Workshop & Promosi Flora Kawasan Timur Indonesia. Kebun Raya Ekakarya Bali, Lembaga Ilmu Pengetahuan Indonesia, Bogor. pp. 1–6.
• Handayani, T., D. Latifah & Dodo 2005. Diversity and growth behaviour of Nepenthes (pitcher plants) in Tanjung Puting National Park, Central Kalimantan Province. Biodiversitas 6(4): 248–252 . Cover
• Hansen, E. 2001. Where rocks sing, ants swim, and plants eat animals: finding members of the Nepenthes carnivorous plant family in Borneo. Discover 22(10): 60–68.
• Hernawati & P. Akhriadi 2006. A Field Guide to the Nepenthes of Sumatra. PILI-NGO Movement, Bogor.
• Hirst, S. 1928. A new tyroglyphid mite (Zwickia nepenthesiana sp. n.) from the pitchers of Nepenthes ampullaria. Journal of the Malayan Branch of the British Royal Asiatic Society 6: 19–22.
• Hooker, J.D. 1859. XXXV. On the origin and development of the pitchers of Nepenthes, with an account of some new Bornean plants of that genus. The Transactions of the Linnean Society of London 22(4): 415–424. doi:10.1111/j.1096-3642.1856.tb00113.x
• Hwee, K.C. 1996. Carnivorous plants and sites in Singapore. Bulletin of the Australian Carnivorous Plant Society, Inc. 15(4): 12–15.
• Kato, M., M. Hotta, R. Tamin & T. Itino 1993. Inter- and intra-specific variation in prey assemblages and inhabitant communities in Nepenthes pitchers in Sumatra. Tropical Zoology 6(1): 11–25. Abstract
• Kitching, R.L. 2000. Food Webs and Container Habitats: The natural history and ecology of phytotelmata. Cambridge University Press, Cambridge.
• Korthals, P.W. 1839. Over het geslacht Nepenthes. In: C.J. Temminck 1839–1842. Verhandelingen over de Natuurlijke Geschiedenis der Nederlandsche overzeesche bezittingen; Kruidkunde. Leiden. pp. 1–44, t. 1–4, 13–15, 20–22.
• (Czech) Koudela, I. 1998. Klíčí nebo neklíčí. Trifid 1998(2): 36–37. (page 2)
• Kurup, R., A.J. Johnson, S. Sankar, A.A. Hussain, C.S. Kumar & S. Baby 2013. Fluorescent prey traps in carnivorous plants. Plant Biology 15(3): 611–615. doi:10.1111/j.1438-8677.2012.00709.x
• Lam, S.Y. 1982. Tripteroides aranoides (Theobald) in two pitcher plants, Nepenthes ampullaria Jack and N. gracilis Korth., at Kent Ridge (Diptera: Culicidae). B.Sc (Hons.) thesis, National University of Singapore.
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• Lee, C.C. 2000. Recent Nepenthes Discoveries. [video] The 3rd Conference of the International Carnivorous Plant Society, San Francisco, USA.
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External links

• Photographs of N. ampullaria at the Carnivorous Plant Photofinder