- Nepenthes angasanensis
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Nepenthes angasanensis 
Nepenthes angasanensis holotype (Salmon & Maulder 234372). Conservation status Scientific classification Kingdom: Plantae (unranked): Angiosperms (unranked): Eudicots (unranked): Core eudicots Order: Caryophyllales Family: Nepenthaceae Genus: Nepenthes Species: N. angasanensis Binomial name Nepenthes angasanensis
Maulder, D.Schub., B.R.Salmon & B.Quinn (1999)[1]
Distribution of N. angasanensis. Synonyms Nepenthes angasanensis (pronounced /nɨˈpɛnθiːz ˌæŋɡəsəˈnɛnsɪs/) is a highland Nepenthes pitcher plant species, native to Sumatra, where it grows at an altitude of 2200 to 2800 m. The status of this taxon is controversial as it is similar in morphology to N. mikei and N. tobaica.
The specific epithet refers to Mount Puncak Angasan, from which the type specimen was collected.[1] No forms or varieties of N. angasanensis have been described.
Contents
Taxonomy
Differences between N. angasanensis, N. mikei and N. tobaica (Salmon & Maulder, 1999) Character N. angasanensis N. mikei N. tobaica Habit Produces offshoots from underground rhizomes No rhizomes No rhizomes Spur Forked Fasciculate Filiform Inner margin of peristome Teeth to 1.5–2 mm long Teeth to 0.2-0.4 mm long Teeth < 0.2 mm Stem cross section Cylindrical Cylindrical Cylindrical to obtusely triangular Bracteoles Sometimes near base of lowest pedicel only Half way up every pedicel At base or slightly below pedicel attachment, few Pitcher glands 300 / cm² 150-180 / cm² 200-250 / cm² Pedicels 1-flowered 1-flowered 2-flowered Inflorescence (female) 55–125 mm long, 9-17 flowers 40–80 mm long, 4-10 flowers 195–400 mm long, 30-50 flowers 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". The sister pair of N. angasanensis and N. mikei has 79% support.[6]
unnamed unnamed 79% N. angasanensis
Natural hybrids
The following natural hybrids involving N. angasanensis have been recorded.
- N. angasanensis × N. densiflora[6]
References
- ^ a b Salmon, B. & R. Maulder 1999. Notes on Nepenthes from Northern Sumatra. Carnivorous Plant Newsletter 28(1): 14–18.
- ^ Jebb, M.H.P. & M.R. Cheek 1997. A skeletal revision of Nepenthes (Nepenthaceae). Blumea 42(1): 1–106.
- ^ Cheek, M.R. & M.H.P. Jebb 2001. Nepenthaceae. Flora Malesiana 15: 1–157.
- ^ Danser, B.H. 1940. A new Nepenthes from Sumatra. Bulletin du Jardin Botanique de Buitenzorg, Série III, 16: 268–271.
- ^ Tamin, R. & M. Hotta 1986. Nepenthes di Sumatera: The genus Nepenthes of the Sumatra Island. In: M. Hotta (ed.) Diversity and Dynamics of Plant Life in Sumatra 1. Kyoto University, Japan. pp. 75–109.
- ^ a b Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
- Clarke et al. (2000). Nepenthes angasanensis. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006.
- Hernawati & P. Akhriadi 2006. A Field Guide to the Nepenthes of Sumatra. PILI-NGO Movement, Bogor.
External links
- Photographs of N. angasanensis at the Carnivorous Plant Photofinder
Incompletely diagnosed taxa: N. sp. Misool • N. sp. Papua • N. sp. Sulawesi
Possible extinct species: N. echinatus • N. echinosporus • N. major
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