Friday 17 May
Pitcher plant (Nepenthes clipeata)
Pitcher plant fact file
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Pitcher plant description
The tropical pitcher plants of Asia (Nepenthes) are amongst the largest and most spectacular of all carnivorous plants. Nepenthes clipeata is a red-stemmed vine that crawls along the ground (2), with fine roots that are attached to a creeping rhizome (4). From coiled tendrils hang modified pitcher-shaped leaves, into which insects and other invertebrates fall. Nepenthes species usually have two or three different types of pitcher, generally known as upper and lower pitchers (4). The cone-shaped pitchers of Nepenthes clipeata are white with red blotches (2), and contain an acidic fluid, secreted by the many glands, which cover the inside surface of the lower half of the pitcher (4). The smooth and waxy upper inner surface of the pitcher makes it impossible for captive insects to gain a foothold (4), and a ridge of hardened tissue lining the mouth of the pitcher, the peristome, bears downward pointing teeth, also preventing insects from escaping (2). A lid overhangs the mouth of the pitcher preventing rain water from diluting the pitcher fluid (2).Top
Pitcher plant biology
Pitcher plants are dioecious meaning that male and female flowers grow on separate plants (4), and only begin to flower once the upper pitchers are produced (2). During the early evening and night, the flowers produce large amounts of nectar which evaporates by the morning. This nectar attracts flies during the early evening and moths at night to aid pollination. Once fertilised a fruit usually takes about three months to develop and ripen. The fruits each contain between 100 and 500 very light, winged, seeds, measuring up to 30 millimetres long which are thought to be dispersed by the wind (2) (4). Despite enormous numbers of seeds being produced, only a few manage to germinate and only a fraction of those survive to maturity (2).
Carnivorous pitcher plants are adapted to grow in soils low in nutrients. Although the plants do gain some nutrition through the soil, and energy through photosynthesis, they supplement this with a diet of invertebrates, usually consisting of ants, cockroaches, centipedes, flies and beetles. Insects are attracted to the pitchers by their bright colours and nectar, which is secreted by glands situated on the lid and the peristome of the pitcher. The insects fall into the acidic fluid at the base of the pitcher and, unable to escape, they drown. Digestive enzymes are then released to break down the captured prey (4).
Despite the hostile environment of the pitchers, they can be home to number of animals, such as the red crab spider (Misumenops nepenthicola). The red crab spider ambushes insects that crawl into the pitcher and preys upon other insects, such as mosquitoes, as they emerge from larvae that live in the pitcher fluid (2).Top
Pitcher plant range
Found in the Kalimantan region of Eastern Borneo, where it is restricted to the slopes of Mount Kelam (5).Top
Pitcher plant habitat
Nepenthes clipeata grows in crevices along with grasses and Sphagnum moss species on the sheer granite cliffs of Mount Kelam, at altitudes between 600 and 800 metres (2).Top
Pitcher plant statusTop
Pitcher plant threats
Nepenthes clipeata is in serious danger of becoming extinct in the wild. This species is prized by collectors and virtually all accessible plants have been removed. In 1995, only 15 known plants remained. It has an extremely restricted distribution making it vulnerable to habitat loss and degradation, and catastrophic events such as drought and fire. Recently, much of the vegetation on Mount Kelam was burned, damaging the habitat and further reducingthe ability of Nepenthes clipeata to recover from over collection (2).Top
Pitcher plant conservation
Nepenthes clipeata does not grow in any protected area or national park. There is also no local awareness of its threatened status (2). Although listed under Appendix II on the Convention on International Trade in Endangered Species (CITES), which limits the international export of this species (3), trade is very difficult to regulate. There is no requirement for internationally traded Nepenthes to be identified down to species level and plants simply labelled as Nepenthes accounted for 94 percent of all exported Nepenthes plants between 1988 and 1993. This needs to be remedied and urgent attention is required to close other loopholes (2). Nepenthes clipeata is now being cloned from tissue culture helping to reduce the impact of private collections on the wild population (6). Detailed field surveys are required to fully assess the exact status of this species, before it disappears completely from the face of Mount Kelam (2).Top
Find out more
For more information on Nepenthes species see:
- International Carnivorous Plant Society:
- Clarke, C. (1997) Nepenthes of Borneo. NaturalHistory Publications, Kota Kinabalu, Malaysia.
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- Proteins that trigger, or accelerate, activity in the cells of the body, for example, breaking down foods during digestion, and building new proteins.
- In a flowering plant, fertilisation is the process of a pollen grain joining with the ovule (female egg cell). After fertilisation, the female parts of the flower develop into a fruit.
- Animals with no backbone.
- Stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
- Metabolic process characteristic of plants in which carbon dioxide is broken down, using energy from sunlight absorbed by the green pigment chlorophyll. Organic compounds are made and oxygen is given off as a by-product.
- The transfer of pollen grains from the stamen (male part of a flower) to the stigma (female part of a flower) of a flowering plant. This usually leads to fertilisation, the development of seeds and, eventually, a new plant.
- Thickened, branching, creeping storage stems. Although most rhizomes grow laterally just along or slightly below the soil's surface, some grow several inches deep. Roots grow from the underside of the rhizome, and during the growing season new growth sprouts from buds along the top. A familiar rhizome is the ginger used in cooking.
- IUCN Red List (March, 2008)
- Clarke, C. (1997) Nepenthes of Borneo. NaturalHistory Publications, Kota Kinabalu, Malaysia.
- CITES (March, 2008)
- Shiva, R.G. (1984) Pitcher Plants of Peninsular Malaysia and Singapore. Maruzan Asia Pte Ltd, Singapore.
- Jebb, M. and Creek, M. (1997) A skeletal revision of Nepenthes. Blumea, 42: 1 - 106.
- Wistuba.com (April, 2008)
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