Nepenthes rajah

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Nepenthes rajah
Large lower pitcher of Nepenthes rajah.  Mount Kinabalu, Borneo.
Large lower pitcher of Nepenthes rajah. Mount Kinabalu, Borneo.
Conservation status

Endangered ( IUCN 2.3)
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Caryophyllales
Family: Nepenthaceae
Genus: Nepenthes
Species: N. rajah
Binomial name
Nepenthes rajah
Hook.f. (1859)
Borneo, showing natural range of Nepenths rajah highlighted in green.
Borneo, showing natural range of Nepenths rajah highlighted in green.
Synonyms
  • Nepenthes rajah
    auct. non Hook.f.: A.Slack (1986)
    [= Nepenthes × alisaputrana]
  • Nepenthes rajah
    auct. non Hook.f.: G.Cheers (1992)
    [= Nepenthes × kinabaluensis]

Nepenthes rajah (pronounced /nəˈpɛnθiːz ˈrɑːdʒə/) is an insectivorous pitcher plant species of the monotypic Nepenthaceae family. It is endemic to Mount Kinabalu and neighbouring Mount Tambuyukon in Sabah, Malaysian Borneo. N. rajah grows exclusively on serpentine substrates, particularly in areas of seeping ground water, where the soil is loose and permanently moist. The species has an altitudinal range of 1500 to 2650 m a.s.l. and is thus considered a highland or sub- alpine plant. Due to its localised distribution, N. rajah is classified as an endangered species by the IUCN and listed on CITES Appendix I.

N. rajah was first collected by Hugh Low on Mount Kinabalu in 1858. It was described the following year by Joseph Dalton Hooker, who named it after James Brooke, the first White Rajah of Sarawak. Hooker called it "one of the most striking vegetable productions hither-to discovered". Since being introduced into cultivation in 1881, N. rajah has always been a much sought-after species. For a long time, it was a plant seldom seen in private collections due to its rarity, price, and specialised growing requirements. Recent advances in tissue culture technology have resulted in prices falling dramatically, and N. rajah is now relatively widespread in cultivation.

N. rajah is most famous for the giant urn-shaped traps it produces, which can grow up to 35 cm high and 18 cm wide. These are capable of holding 3.5 litres of water and in excess of 2.5 litres of digestive fluid, making them probably the largest in the genus by volume. Another characteristic morphological feature of N. rajah is the peltate leaf attachment of the lamina and tendril, which is present in only a few other species.

N. rajah is known to occasionally trap vertebrates and even small mammals. Drowned rats have been observed in the pitchers of N. rajah. It is one of only two Nepenthes species documented as having caught mammalian prey in the wild, the other being N. rafflesiana. N. rajah is also known to occasionally trap other small vertebrates, including frogs, lizards and even birds, although these cases probably involve sick animals and certainly do not represent the norm. Insects, and particularly ants, comprise the majority of prey in both aerial and terrestrial pitchers.

Although N. rajah is most famous for trapping and digesting animals, its pitchers also play host to a large number of other organisms, which are thought to form a mutually beneficial ( symbiotic) association with the plant. Many of these animals are so specialised that they cannot survive anywhere else, and are referred to as nepenthebionts. N. rajah has two such mosquito taxa named after it: Culex rajah and Toxorhynchites rajah.

N. rajah is known to hybridise relatively easily in the wild. Hybrids between it and all other Nepenthes species on Mount Kinabalu, with the exception of N. lowii, have been recorded. Due to the slow-growing nature of N. rajah, no hybrids involving it have been artificially produced as of yet.

Etymology

James Brooke
James Brooke

Joseph Dalton Hooker described N. rajah in 1859, naming it in honour of Sir James Brooke, the first White Rajah of Sarawak. In the past, the Latin name was written as Nepenthes Rajah, since it derives from a proper noun. However, this capitalisation is considered incorrect today. Rajah Brooke's Pitcher Plant is an accurate, but seldom-used common name. N. rajah is also sometimes called the Giant Malaysian Pitcher Plant or simply Giant Pitcher Plant, although the binomial name remains by far the most popular way of referring to this species. The specific epithet rajah means "King" in Malay and this, coupled with the impressive size of its pitchers, has meant that N. rajah is often referred to as the "King of Nepenthes".

Plant characteristics

Mature plants with both lower and upper pitchers
Mature plants with both lower and upper pitchers

Nepenthes rajah, like virtually all species in the genus, is a scrambling vine. The stem usually grows along the ground, but will attempt to climb whenever it comes into contact with an object that can support it. The stem is relatively thick (≤30 mm) and may reach up to 6 m in length, although it rarely exceeds 3 m. N. rajah does not produce runners as some other species in the genus, but older plants are known to form basal offshoots. This is especially common in plants from tissue culture, where numerous offshoots may form at a young age.

Leaves

Leaves are produced at regular intervals along the stem. They are connected to the stem by sheathed structures known as petioles. A long, narrow tendril emanates from the end of each leaf. At the tip of the tendril is a small bud which, when physiologically activated, develops into a functioning trap. Hence, the pitchers are modified leaves and not specialised flowers as is often believed. The green structure most similar to a normal leaf is specifically known as the lamina or leaf blade.

Characteristic peltate leaf attachment of N. rajah
Characteristic peltate leaf attachment of N. rajah

The leaves of N. rajah are very distinctive and reach a large size. They are leathery in texture with a wavy outer margin. The leaves are characteristically peltate, whereby the tendril joins the lamina on the underside, before the apex. This characteristic is more pronounced in N. rajah than in any other Nepenthes species, with the exception of N. clipeata. However, it is not unique to these two taxa, as mature plants of many Nepenthes species display slightly peltate leaves. The tendrils are inserted ≤5 cm below the leaf apex and reach a length of approximately 50 cm. Three to five longitudinal veins run along each side of the lamina and pennate (branching) veins run towards the margin. The lamina is oblong to lanceolate-shaped, ≤80 cm long and ≤15 cm wide.

Pitchers

All Nepenthes pitchers share several basic characteristics. Traps consist of the main pitcher cup, which is covered by an operculum or lid that prevents rainwater from entering the pitcher and displacing or diluting its contents. A reflexed ring of hardened tissue, known as the peristome, surrounds the entrance to the pitcher (only the aerial pitchers of N. inermis lack a peristome). A pair of fringed wings run down the front of lower traps and these presumably serve to guide terrestrial insects into the pitchers' mouth. Accordingly, the wings are greatly reduced or completely lacking in aerial pitchers, for which flying insects constitute the majority of prey items.

Terrestrial pitcher
Terrestrial pitcher

N. rajah, like most species in the genus, produces two distinct types of traps. "Lower" or "terrestrial" pitchers are the most common. These are very large, richly coloured, and ovoid in shape. In lower pitchers, the tendril attachment occurs at the front of the pitcher cup relative to the peristome and wings. Exceptional specimens may be up to 40 cm high and capable of holding 3.5 litres of water and in excess of 2.5 litres of digestive fluid, although most do not exceed 200 ml. The lower pitchers of N. rajah are probably the largest in the genus by volume, rivaled only by those of N. merrilliana, N. truncata and the giant form of N. rafflesiana. These traps rest on the ground and are often reclined, leaning against surrounding objects for support. They are usually red to purple on the outside, whilst the inside surfaces are lime green to purple. This contrasts with all other parts of the plant, which are yellow-green. The lower pitchers of N. rajah are unmistakable and for this reason it is easy to distinguish it from all other Bornean Nepenthes species.

Rare aerial pitcher
Rare aerial pitcher

Mature plants may also produce "upper" or "aerial" pitchers, which are much smaller, funnel-shaped, and usually less colourful than the lowers. The tendril attachment in upper pitchers is normally present at the rear of the pitcher cup. True upper pitchers are seldom seen, as the stems of N. rajah rarely attain lengths greater than a few metres before dying off and being replaced by off-shoots from the main rootstock.

Upper and lower pitchers differ significantly in morphology, as they are specialised for attracting and capturing different prey. Pitchers that do not fall directly into either category are simply known as "intermediate" pitchers.

The peristome of N. rajah has a highly distinctive scalloped edge and is greatly expanded, forming an attractive red lip around the trap's mouth. A series of raised protrusions, known as ribs, intersect the peristome, ending in short, sharp teeth that line its inner margin. Two fringed wings run from the tendril attachment to the lower edge of the peristome.

The huge, vaulted lid of N. rajah, the largest in the genus, is another distinguishing characteristic of this species. It is ovate to oblong in shape and has a distinct keel running down the middle. The spur at the back of the lid is approximately 20 mm long and unbranched.

N. rajah is noted for having very large nectar- secreting glands covering its pitchers. These are quite different from those of any other Nepenthes and are easily recognisable (see image). The inner surface of the pitcher, in particular, is wholly glandular, with 300 to 800 glands/cm².

Flowering plant of N. rajah
Flowering plant of N. rajah

Flowers

N. rajah seems to flower at any time of the year. Flowers are produced in large numbers on inflorescences that arise from the apex of the main stem. N. rajah produces a very large inflorescence that can be 80 cm, and sometimes even 120 cm tall. The individual flowers of N. rajah are produced on partial peduncles (twin stalks) and so the inflorescence is called a raceme (as opposed to a panicle for multi-flowered bunches). The flowers are reported to give off a strong sugary smell and are brownish-yellow in colour. Sepals are elliptic to oblong and ≤8 mm long. Like all Nepenthes species, N. rajah is dioecious, which means that unisexual flowers occur on different individuals. Fruits are orange-brown and 10 to 20 mm long (see image).

Other characteristics

The root system of N. rajah is notably extensive, although it is relatively shallow as in most Nepenthes species.

All parts of the plant are covered in long, white hairs when young, but mature plants are virtually glabrous (lacking hair). This covering of hair is known as the indumentum.

The colour of herbarium specimens is dark-brown in varying hues (see image).

Little variation has been observed within natural populations of Nepenthes rajah and, consequently, no forms or varieties have been described. Furthermore, N. rajah has no true nomenclatural synonyms, unlike many other Nepenthes species, which exhibit greater variability.

Carnivory

Drowned lizard found in a freshly opened pitcher. The animal was pulled out of the digestive zone for the photograph.
Drowned lizard found in a freshly opened pitcher. The animal was pulled out of the digestive zone for the photograph.

Nepenthes rajah is a carnivorous plant of the pitfall trap variety. It is famous for occasionally trapping vertebrates and even small mammals. There exist at least two records of drowned rats found in N. rajah pitchers. The first observation dates from 1862 and was made by Spenser St. John, who accompanied Hugh Low on two ascents of Mount Kinabalu. In 1988, Anthea Phillipps and Anthony Lamb confirmed the plausibility of this record when they managed to observe drowned rats in a large pitcher of N. rajah. N. rajah is also known to occasionally trap other small vertebrates, including frogs, lizards and even birds, although these cases probably involve sick animals, or those seeking shelter or water in the pitcher, and certainly do not represent the norm. Insects, and particularly ants, comprise the majority of prey in both aerial and terrestrial pitchers. Other arthropods, such as centipedes, also fall prey to N. rajah.

N. rafflesiana is the only other Nepenthes species reliably documented as having caught mammalian prey in its natural habitat. In Brunei, frogs, geckos and skinks have been found in the pitchers of this species. The remains of mice have also been reported.

On September 29, 2006, at the Jardin botanique de Lyon in France, a cultivated N. truncata was photographed containing the decomposing corpse of a mouse.

Interactions with animals

Pitcher infauna

Although Nepenthes are most famous for trapping and digesting animals, their pitchers also play host to a large number of other organisms (known as infauna). These include fly and midge larvae, spiders (most notably the crab spider Misumenops nepenthicola), mites, ants, and even a species of crab, Geosesarma malayanum. The most common and conspicuous predators found in pitchers are mosquito larvae, which consume large numbers of other larvae during their development. Many of these animals are so specialised that they cannot survive anywhere else, and are referred to as nepenthebionts.

The complex relationships between these various organisms are not yet fully understood. The question of whether infaunal animals "steal" food from their hosts, or whether they are involved in a mutually beneficial ( symbiotic) association has yet to be investigated experimentally and is the source of considerable debate. Clarke suggests that mutualism is a "likely situation", whereby "the infauna receives domicile, protection and food from the plant, while in return, the infauna helps to break down the prey, increase the rate of digestion and keep bacterial numbers low".

Species specific

As the size and shape of Nepenthes pitchers vary greatly between species, but little within a given taxon, it is not surprising that many infaunal organisms are specially adapted to life in only the traps of particular species. N. rajah is no exception, and in fact has two mosquito taxa named after it. Culex (Culiciomyia) rajah and Toxorhynchites (Toxorhynchites) rajah were described by Masuhisa Tsukamoto in 1989, based on larvae collected in pitchers of N. rajah on Mount Kinabalu three years earlier. The two species were found to live in association with larvae of Culex (Lophoceraomyia) jenseni, Uranotaenia (Pseudoficalbia) moultoni and an undescribed taxon, Tripteroides (Rachionotomyia) sp. No. 2. Concerning C. rajah, Tsukamoto noted that the "body surface of most larvae are covered in Vorticella-live protozoa". At present, nothing is known of this species with regards to its adult biology, habitat, or medical importance as a vector of diseases. The same is true for T. rajah; nothing is known of its biology except that adults are not haematophagous.

Damage caused by pests
Damage caused by pests

Another species, Culex shebbearei, has also been recorded as an infaunal organism of N. rajah in the past. The original 1931 record by F. W. Edwards is based on a collection by H. M. Pendlebury in 1929 from a plant growing on Mount Kinabalu. However, Tsukamoto notes that in light of new information on these species, "it seems more likely to conclude that the species [C. rajah] is a new species which has been misidentitied as C. shebbearei for a long time, rather than to think that both C. shebbearei and C. rajah n. sp. are living in pitchers of Nepenthes rajah on Mt. Kinabalu".

Pests

Not all interactions between Nepenthes and fauna are beneficial to the plant. N. rajah is sometimes attacked by insects which feed on its leaves and remove substantial portions of the lamina. Also, monkeys and tarsiers are known to occasionally rip pitchers open to feed on their contents.

Classification

Regiae Clade
N. maxima N. pilosa N. clipeata
N. oblanceolata * N. burbidgeae N. truncata
N. veitchii N. rajah N. fusca
N. ephippiata N. boschiana N. stenophylla **
N. klossii N. mollis N. lowii
 * Now considered a junior synonym of N. maxima.
 ** Danser's description was based on the type specimen of N. fallax.
Distribution of the Regiae
 Distribution of the Regiae, based on Danser (1928).
 Note: it is now known that N. maxima is absent from Borneo.

Nepenthes rajah is not generally considered to be closely related to any other species, due to its unusual pitcher and leaf morphology. However, several attempts have been made to deduce natural groupings within the Nepenthes genus, in order to show relationships between taxa below those at the genus rank, which have grouped N. rajah with other species thought to share certain traits with it.

Nineteenth century

The Nepenthes were first split up in 1873, when Hooker published his monograph on the genus. Hooker distinguished N. pervillei from all other taxa based on the fact that seeds of this species lacked appendages that were found to be present in all other Nepenthes (though greatly reduced in N. madagascariensis) and subsequently placed it in the monotypic subgenus Anurosperma (Latin: anuro: without nerves, sperma: seeds). All other species were subsumed in the second subgenus, Eunepenthes (Latin: eu: true; "true" Nepenthes).

A second attempt to establish a natural subdivision within the genus was made in 1895 by Günther von Mannagetta und Lërchenau Beck in his Monographische Skizze (German for Monographic Sketch). Beck kept the two subgenera created by Hooker, but divided Eunepenthes into three subgroups: Retiferae, Apruinosae and Pruinosae. N. rajah formed part of the Apruinosae (Latin: pl. of apruinosa: not frosted). Most contemporary taxonomists agree that Beck's groupings have little, if any, taxonomical value, as they were based on arbitrary traits not suitable for use as a basis for classification.

Twentieth century

Nepenthes taxonomy was once again revised in 1908 by John Muirhead Macfarlane in his own monograph. Oddly, Macfarlane did not name the groups he distinguished. His revision is often not considered to be a natural division of the genus.

In 1928, B. H. Danser published his seminal monograph, The Nepenthaceae of the Netherlands Indies, in which he divided Nepenthes into six clades, based on observations of herbarium material. The clades were: the Vulgatae, Montanae, Nobiles, Regiae, Insignes and Urceolatae. Danser placed N. rajah in the Regiae (Latin: pl. of rēgia: royal). The Regiae clade as proposed by Danser is shown in the table to the right.

Most of the species in this clade are large plants with petiolate leaves, an indumentum of coarse reddish-brown hairs, raceme-like inflorescence, and funnel-shaped (infundibulate) upper pitchers. All bear a characteristic appendage on the lower surface of the lid near the apex. With the exception of N. lowii, the Regiae all have a mostly flattened or expanded peristome. The majority of species comprising Regiae are endemic to Borneo. Based on current understanding of the genus, Regiae appears to reflect the relationships of its members quite well, although the same cannot be said for the other clades. Despite this, Danser's classification was undoubtedly a great improvement on previous attempts.

The taxonomical work of Danser (1928) was revised by Hermann Harms in 1936. Harms divided Nepenthes into three subgenera: Anurosperma Hooker.f. (1873), Eunepenthes Hooker.f. (1873) and Mesonepenthes Harms (1936) (Latin: meso: middle; "middle" Nepenthes). The Nepenthes species found in the subgenera Anurosperma and Mesonepenthes differ from those in the Vulgatae, where Danser had placed them. Harms included N. rajah in the subgenus Eunepenthes together with the great majority of other Nepenthes; Anurosperma was a monotypic subgenus, while Mesonepenthes contained only three species. He also created an additional clade, the Distillatoriae (after N. distillatoria).

Glandular morphology

In 1976, Shigeo Kurata proposed that glands present in Nepenthes pitchers were unique to individual species and could be used to distinguish between closely-related taxa or even be used as a basis for their classification. Kurata studied two types: the nectar glands of the lid and the digestive glands of the inside of the pitcher cup. He divided the latter into the "lower", "upper" and "middle" parts. Although this novel approach shed additional light on the similarities between certain species, it has since been largely abandoned by taxonomists and botanists specialising in the genus, in favour of classical taxonomical nomenclature based on a description of morphological characters.

Distribution of phenolic compounds and leucoanthocyanins in N. × alisaputrana, N. burbidgeae and N. rajah
Taxon
1
2
3
4
5
6
7
 8 
Specimen
N. × alisaputrana
+
++
3+
3+
+
++
3+
+
J2442
in vitro
+
++
3+
3+
+
++
+
+
N. burbidgeae
3+
++
3+
3+
-
+
-
-
J2484
N. rajah
-
-
+
±
++
++
3+
+
J2443
Key: 1: Phenolic acid, 2: Ellagic acid, 3: Quercetin, 4: Kaempferol, 5: Luteolin, 6: 'Unknown Flavonoid 1', 7: 'Unknown Flavonoid 3', 8: Cyanidin

±: very weak spot, +: weak spot, ++: strong spot, 3+: very strong spot, -: absent, J = Jumaat Source: OnLine Journal of Biological Sciences 2 (9): 623–625. PDF

Biochemical analysis

More recently, biochemical analysis has been used as a means to determine cladistical relationships between Nepenthes species. In 1975, David E. Fairbrothers et al. first suggested a link between chemical properties and certain morphological groupings, based on the theory that morphologically similar plants produce chemical constituents with similar therapeutic effects.

In 2002, phytochemical screening and analytical chromatography were used to study the presence of phenolic compounds and leucoanthocyanins in several naturally-occurring hybrids and their putative parental species (including N. rajah) from Sabah and Sarawak. The research was based on leaf material from nine dry herbarium specimens. Eight spots containing phenolic acids, flavonols, flavones, leucoanthocyanins and 'unknown flavonoid' 1 and 3 were identified from chromatographic profiles. The distributions of these in the hybrid N. × alisaputrana and its putative parental species N. rajah and N. burbidgeae are shown in the table to the left. A specimen of N. × alisaputrana grown from tissue culture ( in vitro) was also tested.

Phenolic and ellagic acids were undetected in N. rajah, while concentrations of kaempferol were found to be very weak. Chromatographic patterns of the N. × alisaputrana samples studied showed complementation of its putative parental species.

Myricetin was found to be absent from all studied taxa. This agrees with the findings of previous authors ( R. M. Som in 1988; M. Jay and P. Lebreton in 1972) and suggests that the absence of a widely distributed compound like myricetin among the Nepenthes examined might provide "additional diagnostic information for these six species".

Sequencing

Several proteins and nucleotides of N. rajah have been either partially or completely sequenced. These are as follows:

  • translocated tRNA-Lys (trnK) pseudogene (DQ007139)
  • trnK gene & maturase K (matK) gene (AF315879)
  • trnK gene & maturase K (matK) gene (AF315880)
  • maturase K (AAK56010)
  • maturase K (AAK56011)

Related species?

In 1998, a striking new species of Nepenthes was discovered in the Philippines by Andreas Wistuba. Temporarily dubbed N. sp. Palawan 1, it bears a close resemblance to N. rajah in terms of pitcher and leaf morphology. Due to the geographic distance separating the two species, it is unlikely they are in any way closely related. Thus, this case might represent an example of convergent evolution, whereby two organisms not closely related independently acquire similar characteristics while evolving in separate, but comparable, ecosystems. In 2007, the species was described by Wistuba and Joachim Nerz as N. mantalingajanensis.

History and popularity

Hugh Low
Hugh Low

Due to its size, unusual morphology and striking colouration, N. rajah has always been a very popular and highly sought-after insectivorous plant. However, despite its popularity amongst pitcher plant enthusiasts, it is fair to say that Nepenthes rajah remains a little known species outside the field of carnivorous plants. Due to its specialised growing requirements, it is not a suitable candidate for a houseplant and, as such, is only cultivated by a relatively small number of hobbyists and professional growers worldwide. This being the case, N. rajah is nonetheless probably the most famous of all pitcher plants. Its reputation for producing some of the most magnificent pitchers in the genus dates back to the late 18th century.

Early history

N. rajah was first collected by Hugh Low on Mount Kinabalu in 1858. It was described the following year by Joseph Dalton Hooker, who named it after James Brooke, the first White Rajah of Sarawak. The description was published in The Transactions of the Linnean Society of London:

Nepenthes Rajah, H. f. (Frutex, 4-pedalis, Low). Foliis maximis 2-pedalibus, oblongo-lanceolatis petiolo costaque crassissimis, ascidiis giganteis (cum operculo l-2-pedalibus) ampullaceis ore contracto, stipite folio peltatim affixo, annulo maximo lato everso crebre lamellato, operculo amplissimo ovato-cordato, ascidium totum æquante.—(Tab. LXXII.) Hab.—Borneo, north coast, on Kina Balu, alt. 5,000 feet (Low). This wonderful plant is certainly one of the most striking vegetable productions hitherto discovered, and, in this respect, is worthy of taking place side by side with the Rafflesia Arnoldii. It hence bears the title of my friend Rajah Brooke, of whose services, in its native place, it may be commemorative among botanists. . . . I have only two specimens of leaves and pitchers, both quite similar, but one twice as large as the other. Of these, the leaf of the larger is 18 inches long, exclusive of the petioles, which is as thick as the thumb and 7–8 broad, very coriaceous and glabrous, with indistinct nerves. The stipes of the pitcher is given off below the apex of the leaf, is 20 inches long, and as thick as the finger. The broad ampullaceous pitcher is 6 inches in diameter, and 12 long: it has two fimbriated wings in front, is covered with long rusty hairs above, is wholly studded with glands within, and the broad annulus is everted, and 1–1½ inch in diameter. Operculum shortly stipitate, 10 inches long and 8 broad. The inflorescence is hardly in proportion. Male raceme, 30 inches long, of which 20 are occupied by the flowers; upper part and flowers clothed with short rusty pubescence. Peduncles slender, simple or bifid. Fruiting raceme stout. Peduncles 1½ inches long, often bifid. Capsule, ¾ inch long, ⅓ broad, rather turgid, densely covered with rusty tomentum.

One of the earliest known illustrations of N. rajah, published in Life in the Forests of the Far East in 1862.
One of the earliest known illustrations of N. rajah, published in Life in the Forests of the Far East in 1862.

Spenser St. John wrote the following account of his encounter with N. rajah on Mount Kinabalu in Life in the Forests of the Far East published in 1862:

Another steep climb of 800 feet brought us to the Marei Parei spur, to the spot where the ground was covered with the magnificent pitcher-plants, of which we had come in search. This one has been called the Nepenthes Rajah, and is a plant about four feet in length, with broad leaves stretching on every side, having the great pitchers resting on the ground in a circle about it. Their shape and size are remarkable. I will give the measurement of one, to indicate the form: the length along the back nearly fourteen inches; from the base to the top of the column in front, five inches; and its lid a foot long by fourteen inches broad, and of an oval shape. Its mouth was surrounded by a plaited pile, which near the column was two inches broad, lessening in its narrowest part to three-quarters of an inch. The plaited pile of the mouth was also undulating in broad waves. Near the stem the pitcher is four inches deep, so that the mouth is situated upon it in a triangular manner. The colour of an old chalice is a deep purple, but that of the others is generally mauve outside, very dark indeed in the lower part, though lighter towards the rim; the inside is of the same colour, but has a kind of glazed and shiny appearance. The lid is mauve in the centre, shading to green at the edges. The stems of the female flowers we found always a foot shorter than those of the male, and the former were far less numerous than the latter. It is indeed one of the most astonishing productions of nature. [...] The pitchers, as I have before observed, rest on the ground in a circle, and the young plants have cups of the same form as those of the old ones. While the men were cooking their rice, we sat before the tent enjoying our chocolate and observing one of our followers carrying water in a splendid specimen of the Nepenthes Rajah, desired him to bring it to us, and found that it held exactly four pint bottles. It was 19 inches in circumference. We afterwards saw others apparently much larger, and Mr. Low, while wandering in search of flowers, came upon one in which was a drowned rat.

Illustration of the first N. rajah plant to be cultivated in Europe, published in The Garden, 1882.
Illustration of the first N. rajah plant to be cultivated in Europe, published in The Garden, 1882.

N. rajah was first collected for the Veitch Nurseries by Frederick William Burbidge in 1878, during his second trip to Borneo. Shortly after being introduced into cultivation in 1881, N. rajah proved very popular among wealthy Victorian horticulturalists and became a much sought-after species. A note in The Gardeners' Chronicle of 1881 mentions the Veitch plant as follows: "N. rajah at present is only a young Rajah, what it will become was lately illustrated in our columns...". A year later, youn