Nepenthes gracilis (/nɪˈpɛnθiːzˈɡræsɪlɪs/; from Latin: gracilis "slender"), or the slender pitcher-plant,[5] is a common lowland pitcher plant that is widespread in the Sunda region. It has been recorded from Borneo, Cambodia,[6]Peninsular Malaysia, Singapore, Sulawesi, Sumatra, and Thailand.[7][8][9][10][11] The species has a wide altitudinal distribution of 0 to 1100m[12] (and perhaps even 1700m[13]) above sea level, although most populations are found below 100m and plants are rare above 1000m.[13] Despite being a widespread plant, natural hybrids between N.gracilis and other species are quite rare.
Nepenthes gracilis was formally described by Pieter Willem Korthals in his 1839 monograph, "Over het geslacht Nepenthes".[2]
Nepenthes abgracilis from the Philippines is named for its superficial similarity to this species.[14]
Carnivory
The small, elongated pitchers of N.gracilis appear relatively unremarkable and have a very thin peristome. Nevertheless, the species is unusual (and possibly unique) in that the underside of the pitcher lid bears an uneven layer of wax crystals. This layer is not as thick as, and structurally distinct from, that found in the waxy zone of the pitcher interior, and insects can easily adhere to it in dry conditions. During downpours, however, it functions as part of a trapping mechanism, whereby the impact of raindrops striking the lid causes insects to lose their footing and fall into the pitcher cup below.[15]
Left:Nepenthes gracilis upper pitcher with a Polyrhachis pruinosa ant (A and B), showing the waxy zones of the pitcher interior and lower lid surface.
Centre: Scanning electron micrographs revealing the ultrastructure of N.gracilis wax crystals on the inner surface of the pitcher (A and B) and underside of the lid (C and D).
Right: Prey capture efficiency of the two waxy layers and peristome of N.gracilis under 'dry', 'raining' and 'wet' conditions.
Trapping function of N. gracilis pitcher lid under experimental conditions[15]
Ants being flicked off the waxy lower surface of the lid by the action of simulated rain
The same experiment carried out with an isolated lid held in place with a paper clip
High-speed recording showing a house fly (Musca domestica) falling into a pitcher following raindrop impact (recording frame rate: 428 s−1, playback frame rate: 10 s−1)
In 2001, Charles Clarke performed a cladistic analysis of the Nepenthes species of Sumatra and Peninsular Malaysia using 70 morphological characteristics of each taxon. The following is a portion of the resultant cladogram, showing part of "Clade 6", which includes N. gracilis.[20]
(in Dutch) Korthals, P.W. 1839. Over het geslacht Nepenthes. In: C.J. Temminck 1839–1842. Verhandelingen over de Natuurlijke Geschiedenis der Nederlandsche overzeesche bezittingen; Kruidkunde. Leiden. pp. 1–44, t. 1–4, 13–15, 20–22.
McPherson, S.R. 2009. Pitcher Plants of the Old World. 2 volumes. Redfern Natural History Productions, Poole.
McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sulawesi. Redfern Natural History Productions, Poole.
McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Borneo. Redfern Natural History Productions, Poole.
(in Italian) Catalano, M. 2010. Nepenthes della Thailandia: Diario di viaggio. Prague.
McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sumatra and Java. Redfern Natural History Productions, Poole.
McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Peninsular Malaysia and Indochina. Redfern Natural History Productions, Poole.
(in Indonesian) Mansur, M. 2012. Keanekaragaman jenis tumbuhan pemakan serangga dan laju fotosintesisnya di Pulau Natuna. [Diversity on insectivorous plants and its photosynthetic rate in Natuna Island.] Berita Biologi11(1): 33–42. AbstractArchived 2013-09-21 at the Wayback Machine
Clarke, C.M. 2001. Appendix C: Distribution Maps. In: Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu. pp.299–307.
Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
Macfarlane, J.M. 1908. Nepenthaceae. In: A. Engler. Das Pflanzenreich IV, III, Heft 36: 1–91.
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(in Malay) Adam, J.H., J.N. Maisarah, A.T.S. Norhafizah, A.H. Hafiza, M.Y. Harun & O.A. Rahim et al. 2009. Ciri Tanih Pada Habitat Nepenthes (Nepenthaceae) di Padang Tujuh, Taman Negeri Endau-Rompin Pahang. [Soil Properties in Nepenthes (Nepenthaceae) Habitat at Padang Tujuh, Endau-Rompin State Park, Pahang.] In: J.H. Adam, G.M. Barzani & S. Zaini (eds.) Bio-Kejuruteraan and Kelestarian Ekosistem. [Bio-Engineering and Sustainable Ecosystem.] Kumpulan Penyelidikan Kesihatan Persekitaran, Pusat Penyelidikan Bukit Fraser and Universiti Kebangsaan, Malaysia. pp.147–157.
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Chou L.Y., Clarke C.M., Dykes G.A. (2014). "Bacterial communities associated with the pitcher fluids of three Nepenthes (Nepenthaceae) pitcher plant species growing in the wild". Archives of Microbiology. 196 (10): 709–717. doi:10.1007/s00203-014-1011-1. PMID25005571. S2CID14710734.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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