Nepenthes mirabilis

Nepenthes mirabilis (from Latin mirabilis "wonderful"), or the common swamp pitcher-plant and tropical pitcher plant, is a carnivorous plant species. By far the most widespread of all Nepenthes, its range covers continental Southeast Asia and all major islands of the Malay Archipelago (minus the Lesser Sunda Islands and northern Philippines), stretching from China in the north to Australia in the south. The species exhibits great variability throughout its range. One of the more notable varieties, N. mirabilis var. echinostoma, is endemic to Brunei and Sarawak and possesses an extremely wide peristome.
The conservation status of N. mirabilis is listed as Least Concern on the IUCN Red List. In Hong Kong, it is a protected species under Forestry Regulations Cap. 96A.
According to Matthew Jebb and Martin Cheek, the pitchers of N. mirabilis are used as toy phallocrypts in New Guinea.
Distribution
Nepenthes mirabilis has by far the widest distribution of any Nepenthes species and is known from the following countries and regions: Australia (Cape York Peninsula), Borneo, Cambodia, Caroline Islands (Palau and Yap), China (Guangdong Province, Hainan, Hong Kong, and Macau), D'Entrecasteaux Islands, Java, Laos, Louisiade Archipelago, Maluku Islands, Myanmar, New Guinea, Peninsular Malaysia, Philippines (Dinagat and Mindanao), Sulawesi, Sumatra, Thailand, and Vietnam. It has also been recorded from many smaller islands, including Babi, Bangka, Banyak Islands, Batu Islands, Bengkalis, Enggano, Ko Lanta, Ko Tarutao, Langkawi, Mendol, Mentawai Islands (North Pagai, Siberut, Sipura, and South Pagai), Meranti Islands (Padang, Rangsang, and Tebing Tinggi), Nias, Penang, Phuket, Riau Islands (Lingga Islands and Riau Archipelago), Rupat, Tawi-Tawi, and possibly Wowoni.
Taxonomy
Nepenthes mirabilis is closely related to N. rowaniae, N. tenax and N. parvula, the only three Nepenthes species endemic to Australia.
In his Carnivorous Plant Database, taxonomist Jan Schlauer treats N. kongkandana as a synonym of N. mirabilis.
Infraspecific taxa
Across its range, N. mirabilis exhibits great variability in terms of pitcher morphology and colour, and it has the most synonyms of all Nepenthes species. The following forms and varieties of N. mirabilis have been described. With the exception of N. mirabilis var. echinostoma and N. mirabilis var. globosa, these taxa are not considered valid today.
Nepenthes mirabilis f. anamensis (Hort.Weiner) Hort.Westphal (1991)
Nepenthes mirabilis var. anamensis Hort.Weiner in sched. (1985) nom.nud.
Nepenthes mirabilis var. biflora J.H.Adam & Wilcock (1992)
Nepenthes mirabilis var. echinostoma (Hook.f.) Hort.Slack ex J.H.Adam & Wilcock (1992)
Nepenthes mirabilis var. globosa M.Catal. (2010)
Nepenthes mirabilis f. simensis (Hort.Weiner) Hort.Westphal (1991)
Nepenthes mirabilis var. simensis Hort.Weiner in sched. (1985) nom.nud.
Nepenthes mirabilis f. smilesii (Hemsl.) Hort.Westphal (2000)
Nepenthes mirabilis var. smilesii (Hemsl.) Hort.Weiner in sched. (1985)
N. mirabilis var. echinostoma
Nepenthes mirabilis var. echinostoma was discovered by Odoardo Beccari in 1865 and described as a species, N. echinostoma, by Joseph Dalton Hooker in 1873. In 1882, Frederick William Burbidge described this unusual variety in The Gardeners' Chronicle as follows:
Beccari's singular N. echinostoma (vide Herb. Kew) is a wonderful thing, as yet unintroduced—indeed, I suppose unseen by any save Beccari ! The mouths of the urns remind one of the deflexed teeth of some gigantic moss of the Hypnoid section.
Nepenthes mirabilis var. echinostoma is the only form of this species that occurs in Brunei. It has also been recorded from parts of Sarawak, but appears to be completely absent from Sabah.
N. mirabilis var. globosa
Nepenthes mirabilis var. globosa has been recorded from a single undisclosed Andaman Sea island off Phang Nga and from the Thai mainland near the city of Trang.
This variety was featured on the cover of the January 2006 issue of the Journal of Insectivorous Plant Society, identified as "Nepenthes sp. from Thailand". The name Nepenthes globosa appeared in print in an article by Shigeo Kurata in the July 2007 issue of the Journal of the Insectivorous Plant Society. The same issue also featured an article by Masahiro Tada that referred to the plant as "Nepenthes Viking". Prior to its description by Marcello Catalano in 2010, this taxon was also published under the informal name Nepenthes sp. Phanga Nga in Stewart McPherson's 2009 book, Pitcher Plants of the Old World.
In the horticultural trade, this variety is popularly known as both Nepenthes globosa (from Latin: globosus, "globular") and Nepenthes sp. Viking, after the resemblance the pitchers bear to the prow of a Viking ship.
Pitcher infauna
A great number of infaunal organisms have been found in the pitchers of this species. These include the sarcophagid fly Sarcophaga papuensis and the mite Nepenthacarus warreni, which have both been found in Australian populations of the plant. Similarly, the mosquitoes Aedes dybasi and Aedes maehleri reside in the pitchers of N. mirabilis on the islands of Palau and Yap, respectively. Both have unusual life histories and morphological traits associated with this habit.
The nematode Baujardia mirabilis has been described from N. mirabilis in Thailand. It is not thought to be accidental; the pitchers of this species appear to be the nematode's natural habitat. The microecosystems in these pitchers were found to be dominated by mosquito larvae, midges, and B. mirabilis. It is speculated that this nematode might have a phoretic relationship with one or more infaunal insect species.
In southern China, tree frogs have been observed in the pitchers of N. mirabilis. The amphibians do not fall prey to the plant, but rather feed on insects that are caught by the pitchers. They are not affected by the acidic digestive juices (which may have a pH as low as 2), likely due to the mucilaginous outer layer of their skin.
The first record of an aquatic fungus living in the pitcher organ of a carnivorous plant came from a specimen of N. mirabilis growing along the Jardine River in Australia. The mycelial fungus was observed as both free-living in the trap's fluid and attached to chitinous insect remains.
The pitchers of N. mirabilis have also been found to harbour a complex community of bacteria. These bacterial communities appear to be more diverse than those found in the pitcher fluid of N. ampullaria and sympatric N. gracilis in Peninsular Malaysia. In N. mirabilis their composition can also differ significantly according to pitcher type, something not seen in the other two species.
Natural hybrids
Nepenthes mirabilis has the greatest number of known natural hybrids of any species in the genus.
? (N. alata × N. merrilliana) × N. mirabilis [=N. × tsangoya]
N. alata × N. mirabilis [=N. × mirabilata]
N. ampullaria × N. mirabilis [=N. × kuchingensis, Nepenthes cutinensis]
? (N. ampullaria × N. rafflesiana) × N. mirabilis [=N. × hookeriana × N. mirabilis]
N. andamana × N. mirabilis (including N. andamana × N. mirabilis var. globosa)
N. benstonei × N. mirabilis
N. bicalcarata × N. mirabilis (including N. bicalcarata × N. mirabilis var. echinostoma)
? (N. bicalcarata × N. rafflesiana) × N. mirabilis var. echinostoma
N. gracilis × N. mirabilis [=N. × sharifah-hapsahii, N. × ghazallyana, N. × grabilis, N. neglecta?]
N. insignis × N. mirabilis
N. kampotiana × N. mirabilis
N. kongkandana × N. mirabilis
N. merrilliana × N. mirabilis
N. mirabilis × N. northiana
N. mirabilis × N. rafflesiana (including N. mirabilis var. echinostoma × N. rafflesiana)
N. mirabilis × N. reinwardtiana
N. mirabilis × N. rowaniae
N. mirabilis × N. smilesii
N. mirabilis × N. spathulata
N. mirabilis × N. sumatrana
N. mirabilis × N. tenax
N. mirabilis × N. thorelii
N. mirabilis × N. tomoriana
Notes
a.Nepenthes mirabilis was first described under the Linnaean taxonomic system as Phyllamphora mirabilis by João de Loureiro in 1790. It was then transferred to the genus Nepenthes under the incorrect combination Nepenthes phyllamphora by Carl Ludwig Willdenow in 1805. Most sources attribute the earliest publication of the correct binomial—Nepenthes mirabilis—to George Claridge Druce in 1916, despite Jan Schlauer's Carnivorous Plant Database recording a much earlier publication by Rafarin in 1869. Per Article 36.1 of the International Code of Nomenclature for algae, fungi and plants, the publication of the name by Rafarin is not valid because Rafarin specifically indicates that N. mirabilis is a synonym of Phyllamphora mirabilis.
References
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สงขลา / ขนมหม้อข้าวหม้อแกงลิง ขนมไทยภูมิปัญญาชาวบ้าน. [video] 77 NationChannel.
External links
Hong Kong Herbarium: Nepenthes mirabilis
N. mirabilis var. globosa in its natural habitat
Carnivorous plants of Asia
Carnivorous plants of Australia
Carnivorous plants of the Pacific
mirabilis
Caryophyllales of Australia
Flora of Indo-China
Flora of Malesia
Flora of China
Flora of Hong Kong
Flora of Queensland
Least concern biota of Queensland
Endangered flora of Australia
Nature Conservation Act endangered biota
Plants described in 1790