Nepenthes villosa

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Nepenthes villosa
Upper pitcher of Nepenthes villosa from Mount Kinabalu

Least Concern  (IUCN 3.1)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Nepenthaceae
Genus: Nepenthes
Species:
N. villosa
Binomial name
Nepenthes villosa
Hook.f. (1852)
Synonyms
Heterochresonyms

Nepenthes villosa /nɪˈpɛnθiːz vɪˈloʊzə/, or the villose pitcher-plant,[4] is a tropical pitcher plant endemic to Mount Kinabalu and neighbouring Mount Tambuyukon in northeastern Borneo. It grows at higher elevations than any other Bornean Nepenthes species, occurring at elevations of over 3,200 m (10,500 ft). Nepenthes villosa is characterised by its highly developed and intricate peristome, which distinguishes it from the closely related N. edwardsiana and N. macrophylla.[5]

The

specific epithet villosa is Latin for "hairy" and refers to the dense indumentum
of this species.

Botanical history

Left: Plate from Flore des Serres et des Jardins de l'Europe (1858) showing N. veitchii misidentified as N. villosa
Right: Illustration of N. villosa from Life in the Forests of the Far East

Nepenthes villosa was formally described in 1852 by Joseph Dalton Hooker. The description was published in Icones plantarum and accompanied by an illustration.[6]

The species was first collected in 1858 by Hugh Low when he made his second ascent of Mount Kinabalu together with Spenser St. John.[4]

In an issue of Curtis's Botanical Magazine published in 1858, an illustration of an upper pitcher of N. veitchii was incorrectly identified as N. villosa by J. D. Hooker's father, William Jackson Hooker.[7][8] That year, N. villosa was also covered in Flore des Serres et des Jardins de l'Europe by Louis van Houtte, in which the same illustration was reproduced along with the incorrect identification.[9]

In 1859, N. villosa was again described and illustrated in J. D. Hooker's treatment of the genus published in

The Transactions of the Linnean Society of London.[note a][10] The illustration and description were reproduced in Spenser St. John's Life in the Forests of the Far East, published in 1862.[11]

B. H. Danser treated N. edwardsiana in synonymy with N. villosa in his seminal monograph "The Nepenthaceae of the Netherlands Indies", published in 1928. The work included a revised Latin diagnosis and botanical description of N. villosa.[note b][3]

Danser listed four herbarium specimens that he identified as belonging to N. villosa. These include two collected by

Sarawak Museum. The second specimen, Haviland 1813/1353, was collected from the Marai Parai plateau at an elevation of 1,650 m (5,410 ft); it likely represents N. edwardsiana. It is also deposited at the Herbarium of the Sarawak Museum. It does not include floral material. G. D. Haviland explored the Mount Kinabalu area with his brother H. A. Haviland between March and April, 1892, and must have collected these specimens during this time.[12][13]

Additionally, Danser lists two specimens collected by Joseph Clemens in 1915. The first, Clemens 10627, was collected on November 13 from Paka Cave to Low's Peak. It includes female floral material. The second, Clemens 10871, was collected at Marai Parai between November 22 and November 23, and does not include floral material. Both specimens are deposited at the Bogor Botanical Gardens (formerly the Herbarium of the Buitenzorg Botanic Gardens) in Java.[3]

In Letts Guide to Carnivorous Plants of the World, published in 1992, a specimen of the natural hybrid N. × kinabaluensis (N. rajah × N. villosa) is labeled as N. villosa.[14]

In cultivation

In 2004, professional horticulturist Robert Sacilotto published a summary of measured tolerances of six highland Nepenthes species, including N. villosa, based on experiments conducted between 1996 and 2001.[15]

Many of the N. villosa plants in cultivation today originate from a particularly vigorous

Borneo Exotics.[16]

Description

Nepenthes villosa is a weak climber, rarely exceeding 60 cm (24 in) in height,[4] although the stem may grow to 8 m (26 ft) in length and 10 mm (0.4 in) in diameter. Internodes are cylindrical and up to 10 cm (4 in) long.[5]

Leaves are

midrib. Tendrils may reach 50 cm (20 in) in length.[5]

Climbing plant with pitcher

Lower and upper pitchers are very similar. They are

spur, ≤ 20 mm (0.8 in) long, is inserted at the base of the lid.[5]

Unusual elongated upper pitcher

Nepenthes villosa has a

SE = 0.2; CV = 6.7%).[19]

The species has a dense indumentum of long, brown hairs that covers all parts of the plant.[5]

Ecology

Nepenthes villosa is

Mesilau Trail (between Pondok Magnolia and the meeting point with the old summit trail) and almost all the way up to the Laban Rata rest house;[22] a particularly large population has been reported at around 3047 m.[23] On Mount Tambuyukon, an altitudinal inversion has been noted, whereby N. villosa is more common at much lower elevations of 1600–1900 m, being replaced by N. rajah towards the summit.[20] The exposed, uppermost slopes of Mount Tambuyukon can become very hot during the day and this might explain the inability of N. villosa to colonise them.[20] Plants from Mount Tambuyukon generally produce slightly more elongated pitchers.[24]

Nepenthes villosa often grows in

relative humidity is usually close to 100% as the slopes are often enveloped in clouds. Like many Nepenthes from the Mount Kinabalu area, it is endemic to ultramafic soils.[1][4][5]

Although many plants grow along Mount Kinabalu's summit trail and are easily accessible to climbers, all known populations of the species grow within

Conservation Dependent based on this. Clarke writes that N. villosa "has a secure future", although he adds that climbers have had a significant impact on populations of the species growing along the summit trail, with the number of plants having declined in recent years.[5] A 2002 study found 1180 individual N. villosa growing in 11 plots, each measuring 0.01 hectares, at elevations of between 2,610 m (8,560 ft) and 2,970 m (9,740 ft) on Mount Kinabalu. This number constituted 94% of the pitcher plants recorded from the plots, the rest being N. × kinabaluensis.[citation needed
]

Related species

An upper pitcher of N. edwardsiana (left) and N. macrophylla (right)

Nepenthes villosa is most closely related to N. edwardsiana and N. macrophylla. There has been much taxonomic confusion surrounding the status of these three taxa.

Joseph Dalton Hooker, who described both N. edwardsiana and N. villosa, noted the similarity between the two species as follows:[10]

This most remarkable plant [N. villosa] resembles that of edwardsiana in so many respects, especially in the size, form and disposition of the distant lamellae of the mouth, that I am inclined to suspect that it may be produced by young plants of that species, before it arrives at a stage when the pitchers have elongated necks.

Günther Beck von Mannagetta und Lerchenau was the first to treat N. edwardsiana in synonymy with N. villosa when he published his monograph on the genus in 1895.[25]

In his 1908 monograph, John Muirhead Macfarlane wrote the following with regards to the two species: "Examinatione microscopica probatur, illas species distinctas esse".[26] This is probably "based on the old belief that plants, which differ anatomically, can not be forms of the same species".[3]

B. H. Danser united the species "[w]ith some hesitation" in his 1928 monograph "The Nepenthaceae of the Netherlands Indies". He suggested that N. villosa is a stunted form of N. edwardsiana from higher elevations, which flowers at a "juvenile stage of development".[3] Danser acknowledged that the indumentum
of N. villosa is more dense than that of N. edwardsiana, but noted that it "is a difference only of degree".

The two taxa differ considerably in their altitudinal distributions. Nepenthes villosa usually occurs at ultrahighland elevations, 2,300–3,240 m (7,550–10,630 ft),[20] whereas N. edwardsiana is found between 1,500–2,700 m (4,900–8,900 ft).[5] Where their altitudinal distributions overlap, they are still identifiable as distinct species.

Mount Trus Madi.[5]

Matthew Jebb and Martin Cheek suggest that N. villosa is related to N. mira, a species endemic to Palawan in the Philippines.[29][30] N. villosa also shows affinities to N. peltata of Mindanao.[31]

Natural hybrids

Two natural hybrids involving N. villosa have been recorded.[20]

N. edwardsiana × N. villosa

Main article: Nepenthes × harryana
Lower pitcher of N. × harryana

Nepenthes × harryana is the natural hybrid between N. edwardsiana and N. villosa. Its two parent species are very closely related and so N. × harryana, which is intermediate in form, may be difficult to distinguish from either of them.

It was originally described as a species in 1882 by Frederick William Burbidge.[32] John Muirhead Macfarlane was the first to realise its hybrid origin and described it as such in his monograph of 1908.[26] Danser wrote that N. × harryana could be a hybrid as Macfarlane suggested, or a form of N. villosa together with N. edwardsiana.[3]

Nepenthes × harryana can be distinguished from N. villosa on the basis of its pitcher morphology. The pitchers of the hybrid are more cylindrical than those of N. villosa, whereas the indumentum is more dense than that of N. edwardsiana. The hip of the pitcher cup, which is found just below the peristome in N. villosa and in the lower quarter of N. edwardsiana pitchers, is located around the middle of N. × harryana pitchers. However, N. villosa plants from Mount Tambuyukon are easier to confuse with this hybrid, as they produce pitchers that may be elongated slightly above the hip.[5]

Nepenthes × harryana is known from a ridge above the Upper Kolopis River and from two locations along the Kinabalu summit trail. Since N edwardsiana does not grow along the summit trail, it cannot be confused with this hybrid there.[5] Burbidge wrote that N. edwardsiana, N. × harryana, and N. villosa "are quite distinct in zone of the mountain".[32]

N. rajah × N. villosa

Main article: Nepenthes × kinabaluensis
Lower pitcher of N. × kinabaluensis

Nepenthes × kinabaluensis is the natural hybrid between

J. H. Adam and C. C. Wilcock in 1998.[36]

Plant with lower pitchers

The pitchers of N. × kinabaluensis may be quite large, but do not compare to those of N. rajah or

Layang-Layang and the helipad, where it grows at about 2,900 m (9,500 ft) in a clearing dominated by Dacrydium gibbsiae and Leptospermum recurvum trees. N. × kinabaluensis has an altitudinal distribution of 2,420 m (7,940 ft) to 3,030 m (9,940 ft).[37]
It grows in open areas in cloud forest.

The hybrid is generally intermediate in appearance between its parent species. Raised ribs line the inner edge of the peristome and end with elongated teeth. These are more prominent than those found in N. rajah and smaller than those of N. villosa. The peristome is coarse and expanded at the margin (but not scalloped like that of N. rajah), the lid orbiculate or reniform and almost flat. In general, pitchers are larger than those of N. villosa and the tendril joins the apex about 1–2 cm (0.4–0.8 in) below the leaf tip, a feature which is characteristic of N. rajah.[38] In older plants, the tendril can be almost woody. N. × kinabaluensis is an indumentum of villous hairs covering the pitchers and leaf margins, which is approximately intermediate between the parents. Lower pitchers have two fringed wings, whereas the upper pitchers usually lack these. The colour of the pitcher varies from yellow to scarlet. N. × kinabaluensis seems to produce upper pitchers more readily than either of its parents. In all respects N. × kinabaluensis is intermediate between the two parent species and it is easy to distinguish from all other Nepenthes of Borneo. However, it has been confused once before, when the hybrid was misidentified as both N. rajah and N. villosa[39] in Letts Guide to Carnivorous Plants of the World, published in 1992.[14]

Notes

a.^ Hooker's description of N. villosa from 1859 reads:[10]
Ascidia magna, ore lamellis latis disciformibus annularibus remotis instructo.
Nepenthes Villosa, H. f. (Hook, Ic. Pl. t. 888).

—Ascidia magna turgida late pyriformia coriacea, 5" longa, 3½" lata, alis anticis mediocribus grosse dentatis, ore aperto annulo maximo! lamellis annularibus distantibus disciformibus rigidis, 1" diam., cristatis posticis in spinas rigidas ½" longas, fundum ascidii spectantibus productis, collo elongato erecto, operculo orbiculato intus densissime glanduloso dorso basi longe cornuto. (Tab. LXIX.)

Hab.—Borneo (Lobb), Kina Balu, alt. 8,000–9,000 feet (Low).
b.^ The Latin diagnosis for N. villosa from Danser's monograph reads:[3]

Folia mediocria petiolata, lamina obovato-oblonga v. lanceolata, nervis longitudinalibus utrinque 2-3, vagina caulem fere totum amplectente ; ascidia rosularum ignota ; ascidia inferiora magna, breviter ovata, costis 2 ad os alatis fimbriatis ; peristomio operculum versus in collum elongato 6-12 mm lato, costis altis 3-12 mm distantibus, dentibus 1-3 x longioribus quam latis ; operculo rotundato-cordato v. paulum reniformi, facie inferiore plano ; ascidia superiora magna, parte inferiore ventricosa os versus cylindrica, costis 2 prominentibus ; peristomio operculum versus in collum elevato, 12-22 mm lato, costis altis 3-12 mm distantibus, dentibus 1-3 x longioribus quam latis ; operculo rotundato-ovato v. paulum reniformi, facie inferiore plano ; inflorescentia racemus pedicellis inferioribus 12 mm longis omnibus 1-floris ; indumentum villosum.

References

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    doi:10.2305/IUCN.UK.2018-1.RLTS.T39712A143966651.en
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  2. ^ a b Schlauer, J. N.d. Nepenthes villosa. Carnivorous Plant Database.
  3. ^ a b c d e f g h Danser, B.H. 1928. The Nepenthaceae of the Netherlands Indies. Bulletin du Jardin Botanique de Buitenzorg, Série III, 9(3–4): 249–438.
  4. ^ a b c d e Phillipps, A. & A. Lamb 1996. Pitcher-Plants of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
  5. ^ a b c d e f g h i j k l m n o p Clarke, C.M. 1997. Nepenthes of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
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  7. ^ Hooker, W.J. 1858. Nepenthes villosa. Curtis's Botanical Magazine 84, t. 5080.
  8. KiB) Carnivorous Plant Newsletter
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  14. ^ a b Cheers, G. 1992. Letts Guide to Carnivorous Plants of the World. Letts of London House, London.
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  16. ^ Nunn, R., A.J. Lowrie, R. Sivertsen, R. Gibson, G. Bourke, C. Chiang, R. Cantley, D. Williams, B.A. Rice & E. Salvia 2014. In memory of Phillip James Mann (1951-2014). Carnivorous Plant Newsletter 43(4): 112–124.
  17. ^ (in German) Schmid-Hollinger, R. N.d. Kannendeckel (lid) Archived 2013-12-06 at the Wayback Machine. bio-schmidhol.ch.
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  37. Borneo: Its Mountains and Lowlands with their Pitcher Plants
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  39. ^ Schlauer, J. N.d. Nepenthes kinabaluensis Archived 2016-06-24 at the Wayback Machine. Carnivorous Plant Database.

Further reading

External links

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