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Nepenthes: Tropical pitcher plants

Nepenthes ampullaria

Published October 15, 2026Awaiting editor review14 sources

A shade-loving lowland pitcher plant from Thailand to New Guinea that carpets the forest floor with squat, open pitchers. Its reflexed lid lets falling leaves in, and much of its nitrogen comes from leaf litter.

Range
Thailand, Peninsular Malaysia and Singapore, Sumatra, Borneo, Maluku and New Guinea, and many smaller islands in the region [1, 3]. The 1997 skeletal revision of the genus considered it apparently absent from the Moluccas and Sulawesi [2].
Habitat
Damp, shady forest. In Borneo it grows on flat ground in kerangas (heath) forest, peat swamp forest and degraded swamp forest; in Sumatra and Peninsular Malaysia also in padang; in New Guinea in Araucaria forest, open microphyllous vegetation and swamp grassland [3, 2].
Status
Assessed by IUCN for the Red List in 2018; see the assessment for its category [4]. Nunn notes that lowland forest in Peninsular Malaysia, Borneo and Indonesia is being cleared for real estate, oil palm and other crops [3]. Covered by the CITES Appendix II listing for Nepenthes and by Annex B in the EU [5].

Growing conditions at a glance

Guidance published for this species.

Light
Bright but indirect light; it grows in more shade than most Nepenthes, and under shade cloth Nepenthes ampullaria does well at 50 to about 80% shade [3].
Water
Keep the potting medium moist. Nunn suggests misting for a few minutes several times a day with good-quality water and watering by hand every few days [3].
Soil
Nunn reports good results with quality orchid bark, long-fibered Sphagnum and some coarse perlite [3].
Humidity
In a greenhouse, humidity of 50 to 70% by day and up to 100% at night is enough as long as the medium stays moist [3].
Temperature
Warmth is the most important factor: in its lowland habitat days are around 30 °C and nights rarely fall below 24 °C [3].
Dormancy
None; lowland temperatures are stable through the year and day length in its habitat is about 12 to 13 hours [3].

A pitcher built to catch leaves

Most lowland Nepenthes live in open, sunny places and feed on insects, but Nepenthes ampullaria is common under closed forest canopy, where leaves and twigs rain down [6]. Nunn reproduces the Flora Malesiana description, which gives a climber up to 15 m tall with many ground rosettes. Its lower pitchers are obliquely urn-shaped, almost flat in front and up to 10 by 9 cm, with two fringed wings. The mouth is oval and nearly horizontal, edged by a flat peristome up to 1.5 cm wide that slopes steeply inward. The lid is narrow, at most 4 by 1.5 cm, with few or no nectar glands [3].

Upper pitchers are generally not developed. Jebb and Cheek describe tall climbing stems without upper pitchers and lower pitchers carried in rosettes up to 2 m above the ground. They mention only a few reports of small funnel-shaped upper pitchers no more than 2 cm tall, from Brunei and Peninsular Malaysia [2]. One field study explains why they are so rarely seen: the plant stays in its self-supporting stage for a long time [7].

Nunn, drawing on Clarke (2001), lists the features that fit the plant to this diet [3]:

  • The lid is reduced and bent back away from the mouth, so debris drops straight in.
  • Nectar glands, normally a prey lure, are rare or absent on the lid.
  • In ground pitchers the digestive glands reach almost to the peristome, leaving little or no waxy zone.
  • Pitchers grow in dense clusters that carpet the ground, covering as much area as possible.
  • Pitchers stay functional for about six months on average, a long life for a Nepenthes trap.

Other studies agree. N. ampullaria is one of the species with no waxy zone at all [8]. In a comparison of seven lowland Nepenthes in Brunei, its pitchers were green with no visible nectar, and their fluid was near pH 5, against about pH 2 in N. rafflesiana and N. gracilis. They were among the poorest insect catchers, barely reaching 25 prey items per pitcher [7]. Color varies more than shape: pitchers are usually green flecked with maroon, rarely all red and sometimes almost whitish yellow [3].

Evidence for a leaf-litter diet

Moran, Clarke and Hawkins compared plants growing under forest canopy at 20 sites in Borneo with plants at 20 open sites without litterfall. Leaves from the shaded plants had more nitrogen and a stable isotope signature pointing to leaf litter as a source [6]. Their mixing model put the share of leaf nitrogen from litter at about 35.7% [3]. A later feeding experiment estimated that 41.7% of leaf-blade nitrogen and 54.8% of pitcher nitrogen came from leaf litter, and found that litter raised nitrogen, pigment levels and photosynthesis in the leaf blade [9].

The pitchers also house a community. In Brunei heath forest, 164 pitchers on 35 plants gathered an average of 11.5 mg of dry debris in 14 days, larger pitchers more than small ones. They held an average of 26.3 insect larvae each, from nine kinds of fly larvae plus the occasional tadpole [10]. Nunn mentions one of the smallest Old World frogs, Microhyla nepenthicola, and the crab spider Misumenops nepenthicola among the animals recorded from its pitchers [3].

Dengue mosquitoes are a different story. Aedes albopictus larvae can survive in the fluid but rarely colonize the pitchers. In a test near Kuala Lumpur, small green containers like these pitchers received significantly fewer eggs than large black ones [11]. In a 2004 survey of potted Nepenthes kept outdoors in Virginia, no mosquito larvae were found in N. ampullaria pitchers, though N. ventricosa pitchers held them [12].

Names, range and hybrids

William Jack found the species in Singapore in 1819 [3]. Sources differ on when the name was validly published. WCVP dates it to Jack’s Malayan plant descriptions of 1821 [1], while Jebb and Cheek and Nunn treat the 1835 reprint in Companion to the Botanical Magazine as the formal publication [2, 3].

It is one of the most widespread Nepenthes. Nunn and WCVP include Maluku in its range, while the 1997 revision found it apparently absent from the Moluccas and Sulawesi; that revision also notes that eastern and western populations look the same [3, 1, 2]. Most plants grow between sea level and 500 m. Plants above 1700 m are found only in New Guinea [3].

It crosses readily with lowland neighbours, with at least twelve partner species recorded. Two of these hybrids were long treated as species: N. × hookeriana (with N. rafflesiana) and N. × trichocarpa (with N. gracilis) [3, 2].

Growing it

Nunn’s cultivation notes treat it as a lowland plant. Warmth matters most: days around 30 °C with nights rarely below 24 °C, as in its habitat. Give it bright, indirect light, keep the medium moist, and use an open mix of orchid bark, long-fibered Sphagnum and coarse perlite. Insects are its best food, but a dilute orchid fertilizer every few weeks helps in cultivation. He grew it outdoors on a balcony in Singapore for three years [3]. NC State Extension notes that Nepenthes do best in a greenhouse where temperature and humidity can be held steady [13]. See terrariums and humidity, feeding and the genus page for the lowland group.

Because the plant spends long periods as ground rosettes [7, 2], cuttings usually have to come from a rosette. ICPS describes this as a delicate job that can set the parent back half a year to a year [14]. See Nepenthes stem cuttings.

Related guides

Related plants

Sources

  1. Nepenthes ampullaria Jack: World Checklist of Vascular Plants record (via GBIF). Royal Botanic Gardens, Kew; dataset published 2026-06-04, CC BY 4.0. Accepted name, authority, synonyms and native range. Accessed October 12, 2026.
  2. A skeletal revision of Nepenthes (Nepenthaceae). Blumea 42: 1-106 (1997), Jebb and Cheek. Distribution, ecology and altitude; rosette habit and rare upper pitchers; hybrids. Accessed October 12, 2026.
  3. An account of Nepenthes ampullaria Jack. Carnivorous Plant Newsletter 47(2): 47-53 (2018), by Richard Nunn. History, the Flora Malesiana description, distribution and altitude, hybrids, adaptations to leaf litter, infauna, conservation and cultivation. Accessed October 12, 2026.
  4. Nepenthes ampullaria: IUCN Red List of Threatened Species assessment. International Union for Conservation of Nature. Assessment link found through the Red List checklist published on GBIF; Red List categories are not reproduced on this site. Accessed October 12, 2026.
  5. Species+ record: Nepenthes ampullaria (CITES and EU listings). UNEP-WCMC and CITES Secretariat. CITES Appendix II through the genus listing; EU Annex B. Accessed October 12, 2026.
  6. 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 (2003), Moran, Clarke and Hawkins. Plants under forest canopy have lower foliar 15N and higher nitrogen than plants in the open (abstract). Accessed October 12, 2026.
  7. Different pitcher shapes and trapping syndromes explain resource partitioning in Nepenthes species. Ecology and Evolution 6(5): 1378-1392 (2016), Gaume et al.. Long self-supporting stage, green pitchers without visible nectar, fluid pH near 5, few prey. Accessed October 12, 2026.
  8. Insect aquaplaning: Nepenthes pitcher plants capture prey with the peristome, a fully wettable water-lubricated anisotropic surface. Proceedings of the National Academy of Sciences 101(39): 14138-14143 (2004), Bohn and Federle. N. ampullaria lacks a waxy zone. Accessed October 12, 2026.
  9. Nutritional benefit from leaf litter utilization in the pitcher plant Nepenthes ampullaria. Plant, Cell and Environment 34(11): 1865-1873 (2011), Pavlovič, Slováková and Šantrůček. Feeding experiment: share of nitrogen from leaf litter, gains in leaf nitrogen and photosynthesis (abstract). Accessed October 12, 2026.
  10. 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 (1998), J. E. Cresswell. Debris accumulation and insect larvae in pitchers in Brunei heath forest (abstract). Accessed October 12, 2026.
  11. Nepenthes ampullaria (Nepenthaceae) pitchers are unattractive to gravid Aedes aegypti and Aedes albopictus (Diptera: Culicidae). Environmental Entomology 45(1): 201-206 (2016), Chou et al.. Aedes larvae survive in the fluid but pitchers are rarely colonized (abstract). Accessed October 12, 2026.
  12. Asian tiger mosquito, Aedes albopictus (Skuse) (Diptera: Culicidae), larvae in pitchers of Nepenthes ventricosa Blanco (Nepenthaceae) in Virginia. Proceedings of the Entomological Society of Washington 109(2): 489-492 (2007), Duffield and Sheridan. No mosquito larvae found in N. ampullaria pitchers sampled in Virginia. Accessed October 12, 2026.
  13. Nepenthes (North Carolina Extension Gardener Plant Toolbox). NC State Extension. Nepenthes do best in a greenhouse with controlled temperature and humidity. Accessed October 12, 2026.
  14. Nepenthes Propagation via stem cuttings. International Carnivorous Plant Society. Cuttings from species that stay as basal rosettes. Accessed October 12, 2026.