Nepenthes villosa
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 Upper pitcher of Nepenthes villosa from Mount Kinabalu
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| Nepenthes villosa Hook.f. (1852) |
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 Distribution of N. villosa.
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Nepenthes villosa (pronounced /nəˈpɛnθiːz vɪlˈəʊzə/), or the Villose Pitcher-Plant,[1] is a tropical pitcher plant endemic to Mount Kinabalu and neighbouring Mount Tambuyukon in northeastern Borneo. It grows at altitudes higher than any other Bornean Nepenthes species, occurring at elevations of over 3200 m. N. villosa is characterised by its highly-developed and intricate peristome, which distinguishes it from the closely related N. edwardsiana and N. macrophylla.[2]
The specific epithet villosa is Latin for "hairy" and refers to the dense indumentum of this species.
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[edit] Botanical history
N. villosa was formally described in 1852 by Joseph Dalton Hooker. The description was published in Icones plantarum and accompanied by an illustration.[3]
The species was first collected in 1858 by Hugh Low when he made his second ascent of Mount Kinabalu together with Spenser St. John.[1]
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.[4][5]
That year, N. villosa was also covered in Flore des serres et des jardins de l'Europe by Ludwig van Houtte.[6]
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.[I][7] The illustration and description were reproduced in Spenser St. John's Life in the Forests of the Far East, published in 1862.[8]
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.[II][9]
Danser listed four herbarium specimens that he identified as belonging to N. villosa. These include two collected by George Darby Haviland from Mount Kinabalu in 1892. One of these, Haviland 1656/1232, was collected at an altitude of 2400 m. It includes male floral material and is deposited at the Herbarium of the Sarawak Museum. The second specimen, Haviland 1813/1353, was collected from the Marai Parai plateau at an altitude of 1650 m; 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.[10][11]
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.[9]
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.[12]
[edit] Description
N. villosa is a weak climber, rarely exceeding 60 cm in height,[1] although the stem may grow to 8 m in length and 10 mm in diameter. Internodes are cylindrical and up to 10 cm long.[2]
Leaves are coriaceous and petiolate. The lamina is spathulate to oblong and may be up to 25 cm long and 6 cm wide. The apex of the lamina is emarginate. The petiole is canaliculate, up to 10 cm long, and bears a amplexicaul sheath. One to three longitudinal veins are present on either side of the midrib. Tendrils may reach 50 cm in length.[2]
Lower and upper pitchers are very similar. They are urceolate to ovate in shape. The pitchers grow up to 25 cm high[1] and 9 cm wide. A pair of fringed wings (≤15 mm wide) runs down the front of the pitcher, although it may be reduced to ribs in aerial traps. The pitcher mouth is oblique and elongated into a neck at the rear. The glands on the inner surface are overarched and occur at a density of 200 to 1300 per square centimetre.[9] The peristome is cylindrical in cross section and up to 20 mm wide. It bears well developed teeth and ribs. The lid or operculum is cordate and has a pointed apex. An unbranched spur (≤20 mm long) is inserted at the base of the lid.[2]
N. villosa has a racemose inflorescence. The peduncle may be up to 40 cm long, while the rachis grows to 20 cm in length. Pedicels are filiform-bracteolate and up to 15 mm long. Sepals are round to elliptic and up to 4 mm long.[2][13]
N. villosa has a dense indumentum of long, brown hairs that covers all parts of the plant.[2]
[edit] Ecology
N. villosa is endemic to the upper slopes of Mount Kinabalu and the summit of neighbouring Mount Tambuyukon. It has an altitudinal distribution of 2340 to 3240 m above sea level.[1] A particularly large population grows at around 3047 m.[14] N. villosa occurs at the highest altitudes of all Bornean Nepenthes species and only N. lamii from New Guinea is found at greater elevations.[15][2]
N. villosa often grows in mossy forest and sub-alpine forest dominated by species of the genera Dacrydium and Leptospermum, particularly Leptospermum recurvum. It has also been recorded growing among shrubs, grass, and boulders in open areas. Here the soil may become relatively dry, although 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][16][2]
The conservation status of N. villosa is listed as Vulnerable on the 2006 IUCN Red List of Threatened Species.[16] Although many plants grow along Mount Kinabalu's summit trail and are easily accessible to climbers, all known populations of the species grow within Kinabalu National Park and so their collection is illegal. In 1997, Charles Clarke suggested a revised assessment of 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.[2] A 2002 study found 1180 individual N. villosa growing in 11 plots, each measuring 0.01 hectares, at elevations of between 2610 m and 2970 m on Mount Kinabalu. This number constituted 94% of the pitcher plants recorded from the plots, the rest being N. × kinabaluensis.[17]
[edit] Related species
N. 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:[7]
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 von Mannagetta und Lërchenau Beck was the first to treat N. edwardsiana in synonymy with N. villosa when he published his monograph on the genus in 1895.[18]
In his 1908 monograph, John Muirhead Macfarlane wrote the following with regards to the two species: "Examinatione microscopica probatur, illas species distinctas esse".[19] This is probably "based on the old belief that plants, which differ anatomically, can not be forms of the same species".[9]
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 altitudes, which flowers at a "juvenile stage of development".[9] 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. N. villosa occurs at ultrahighland elevations (2340 to 3240 m), whereas N. edwardsiana is found between 1500 and 2700 m.[2] Where their altitudinal distributions overlap, they are still identifiable as distinct species.
N. macrophylla was originally described in 1987 as a subspecies of N. edwardsiana by Johannes Marabini.[20] It was later elevated to species status by Matthew Jebb and Martin Cheek.[15] This interpretation was supported by Charles Clarke, who noted that N. edwardsiana and N. villosa "have more in common" than N. edwardsiana and N. macrophylla.[2] Whereas N. edwardsiana and N. villosa are restricted to the Kinabalu area, N. macrophylla is only found near the summit of Mount Trus Madi.[2]
[edit] Natural hybrids
Two natural hybrids involving N. villosa have been recorded.
[edit] N. edwardsiana × N. villosa
N. × 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.[21] John Muirhead Macfarlane was the first to realise its hybrid origin and described it as such in his monograph of 1908.[19] Danser wrote that N. × harryana could be a hybrid as Macfarlane suggested, or a form of N. villosa together with N. edwardsiana.[9]
N. × 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.[2]
N. × 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.[2] Burbidge wrote that N. edwardsiana, N. × harryana, and N. villosa "are quite distinct in zone of the mountain".[21]
[edit] N. rajah × N. villosa
N. × kinabaluensis is the natural hybrid between N. rajah and N. villosa. It was first collected near Kambarangoh on Mount Kinabalu by Lilian Gibbs in 1910 and later mentioned by John Muirhead Macfarlane as "Nepenthes sp." in 1914.[22] Although Macfarlane did not formally name the plant, he noted that "[a]ll available morphological details suggest that this is a hybrid between N. villosa and N. rajah".[23] It was finally described in 1976 by Shigeo Kurata as N. × kinabaluensis. The name was published in Nepenthes of Mount Kinabalu, but it is a nomen nudum, as it had an inadequate description and lacked information on the type specimen. The name was subsequently republished by Kurata in 1984[24] and by J. H. Adam and C. C. Wilcock in 1996.[25]
The pitchers of N. × kinabaluensis may be quite large, but do not compare to those of N. rajah or N. × alisaputrana (N. burbidgeae × N. rajah). N. × kinabaluensis can only be found on Mount Kinabalu (hence the name) and nearby Mount Tambuyukon, where the two parent species occur sympatrically.[2] More specifically, plants are known from a footpath near Paka Cave and several places along an unestablished route on a south-east ridge, which lies on the west side of the Upper Kolopis River.[22] The only accessible location from which this hybrid is known is the Kinabalu summit trail, between Layang-Layang and the helipad, where it grows at about 2900 m in a clearing dominated by Dacrydium gibbsiae and Leptospermum recurvum trees. N. × kinabaluensis has an altitudinal distribution of 2420 to 3030 m.[26] 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 below the leaf tip, a feature which is characteristic of N. rajah.[27] 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 identified as N. rajah in Letts Guide to Carnivorous Plants of the World.[12]
[edit] Notes
I. ^ Hooker's description of N. villosa from 1859 reads:[7]
II. ^ The Latin diagnosis for N. villosa from Danser's monograph reads:[9]—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.)
- Ascidia magna, ore lamellis latis disciformibus annularibus remotis instructo.
- Nepenthes Villosa, H. f. (Hook, Ic. Pl. t. 888).
- Hab.—Borneo (Lobb), Kina Balu, alt. 8,000–9,000 feet (Low).
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.
[edit] References
- ^ a b c d e f Phillipps, A. & A. Lamb 1996. Pitcher-Plants of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
- ^ a b c d e f g h i j k l m n o Clarke, C.M. 1997. Nepenthes of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
- ^ Hooker, J.D. 1852. Nepenthes Villosa. Icones plantarum 9, t. 888.
- ^ Hooker, W.J. 1858. Nepenthes villosa. Curtis's Botanical Magazine 84, t. 5080.
- ^ Elliot, R.R. 1993. Botanical prints of yesteryear.PDF (516 KiB) Carnivorous Plant Newsletter 22(1–2): 22–25.
- ^ Houtte, L.v. 1858. Nepenthes villosa Hook. Fil.. Flore des serres et des jardins de l'Europe 13(3): 27.
- ^ a b c Hooker, J.D. 1859. On the origin and the development of the pitchers of Nepenthes, with an account of some new Bornean plants of that genus. The Transactions of the Linnean Society of London 22: 415–424.
- ^ St. John, S. 1862. Life in the Forests of the Far East; or, Travels in northern Borneo. 2 volumes. London: Smith, Elder & Co..
- ^ a b c d e f g Danser, B.H. 1928. The Nepenthaceae of the Netherlands Indies. Bulletin de Jardin de Botanique, Buitenzorg, Série III, 9(3–4): 249–438.
- ^ Stapf, O. 1894. Contribution to the flora of Kinabalu. The Transactions of the Linnean Society of London (series 2) 4: 71–76.
- ^ van Steenis-Kruseman, M.J., et al. 2006. Cyclopaedia of Malesian Collectors: George Darby Haviland. Nationaal Herbarium Nederland.
- ^ a b Cheers, G. 1992. Letts Guide to Carnivorous Plants of the World. Letts of London House, London.
- ^ Kaul, R.B. 1982. Floral and fruit morphology of Nepenthes lowii and N. villosa, montane carnivores of Borneo. American Journal of Botany 69(5): 793–803. doi:10.2307/2442970
- ^ Toyoda, Y. 1972. Nepenthes and I - Mt. Kinabalu (Borneo, Malaysia) Trip.PDF (116 KiB) Carnivorous Plant Newsletter 1(4): 62–63.
- ^ a b Jebb, M.H.P. & M.R. Cheek 1997. A Skeletal Revision of Nepenthes (Nepenthaceae). Blumea 42(1): 1–106.
- ^ a b Clarke, C.M., R. Cantley, J. Nerz, H. Rischer & A. Witsuba 2000. Nepenthes villosa. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Listed as Vulnerable (VU D2 v2.3).
- ^ Adam, J.H. 2002. Demographic Study of Nepenthes Species (Nepenthaceae) Recorded along the Trail to the Summit of Mount Kinabalu in Sabah, Malaysia.PDF (302 KiB) Pakistan Journal of Biological Sciences 5(4): 419–426.
- ^ Beck, G.v.M.u.L. 1895. Die Gattung Nepenthes. Wiener Illustrierte Gartenzeitung.
- ^ a b Macfarlane, J.M. 1908. Nepenthaceae. In: A. Engler Das Pflanzenreich IV, III, Heft 36: 1–91.
- ^ Marabini, J. 1987. Eine neue Unterart von Nepenthes edwardsiana Hook.fil. sowie Anmerkungen zur Taxonomie der Gattung Nepenthes L.. Mitt. Bot. Staatssamml. München 23: 423–429.
- ^ a b Burbidge, F.W. 1882. Notes on the new Nepenthes. The Gardeners' Chronicle 17(1): 56.
- ^ a b Kurata, S. 1976. Nepenthes of Mount Kinabalu. Sabah National Parks Publications No. 2, Sabah National Parks Trustees, Kota Kinabalu.
- ^ Macfarlane, J.M. 1914. Nepenthes sp.. Biological Journal of the Linnean Society, XLII.
- ^ Kurata, S. 1984. Journal of the Insectivorous Plant Society (Japan) 35: 65.
- ^ Adam, J.H. & C.C. Wilcock 1996. Sarawak Museum Journal 71: 152.
- ^ Steiner, H. 2002. Borneo: Its Mountains and Lowlands with their Pitcher Plants. Toihaan Publishing Company, Kota Kinabalu.
- ^ Clarke, C.M. 2001. A Guide to the Pitcher Plants of Sabah. Natural History Publications (Borneo), Kota Kinabalu.
- Sacilotto, R. 2004. Experiments with highland Nepenthes seedlings: A Summary of Measured Tolerances. Carnivorous Plant Newsletter 33(1): 26–31.
[edit] External links
- Danser, B.H. 1928. 51. Nepenthes villosa HOOK. F. In: The Nepenthaceae of the Netherlands Indies. Bulletin de Jardin de Botanique, Buitenzorg, Série III, 9(3–4): 249–438.
Miscellaneous: Nepenthes taxonomy • Nepenthes infauna
