| Nepenthes angasanensis | |
|---|---|
| |
| Nepenthes angasanensis holotype (Salmon & Maulder 234372). | |
| Conservation status | |
 Least Concern (IUCN 3.1) | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Nepenthaceae |
| Genus: | Nepenthes |
| Species: | N. angasanensis |
| Binomial name | |
| Nepenthes angasanensis Maulder, D.Schub., B.R.Salmon & B.Quinn (1999) | |
| |
| Distribution of N. angasanensis. | |
| Synonyms | |
| Synonyms | |
Nepenthes angasanensis /nɪˈpɛnθiːz ˌæŋɡəsəˈnɛnsɪs/ is a tropical pitcher plant species endemic to Sumatra, where it grows at an altitude of 1,400 metres (4,600 ft) to 3,100 metres (10,200 ft) above sea level. The status of this taxon is controversial as it is similar in morphology to N. mikei and N. tobaica. It has even been suggested that the taxon might represent a natural hybrid between N. densiflora and N. tobaica.
The specific epithet refers to Mount Puncak Angasan, from which the type specimen was collected. No forms or varieties of N. angasanensis have been described.
Taxonomy
| 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 millimetres (0.06 in) to 2 millimetres (0.08 in) long | Teeth to 0.2 millimetres (0.01 in) to 0.4 millimetres (0.02 in) long | Teeth < 0.2 millimetres (0.01 in) |
| 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 / cm (1900 per sq in) | 150–180 / cm (1000 to 1200 per sq in) | 200–250 / cm (1300 to 1600 per sq in) |
| Pedicels | 1-flowered | 1-flowered | 2-flowered |
| Inflorescence (female) | 5.5 centimetres (2 in) to 12.5 centimetres (5 in) long, 9–17 flowers | 4 centimetres (2 in) to 8 centimetres (3 in) long, 4–10 flowers | 19.5 centimetres (8 in) to 40 centimetres (16 in) 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.
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Natural hybrids
The following natural hybrids involving N. angasanensis have been recorded.
- N. angasanensis × N. densiflora
References
- ^ Clarke, C.M. (2018). "Nepenthes angasanensis". IUCN Red List of Threatened Species. 2018: e.T39642A143958899. doi:10.2305/IUCN.UK.2018-1.RLTS.T39642A143958899.en. Retrieved 13 November 2021.
- ^ 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.
- (in Indonesian) 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: Forest Ecosystem and Speciation in Wet Tropical Environments. Part 1: Reports and Collection of Papers. Kyoto University, Kyoto. pp. 75–109.
- McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sumatra and Java. Redfern Natural History Productions, Poole.
- Schlauer, J. N.d. Nepenthes angasanensis. Carnivorous Plant Database.
- ^ Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
- Clarke, C.M. (2018). "Nepenthes angasanensis". IUCN Red List of Threatened Species. 2018: e.T39642A143958899. doi:10.2305/IUCN.UK.2018-1.RLTS.T39642A143958899.en. Retrieved 13 November 2021.
- 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
| Taxon identifiers | |
|---|---|
| Nepenthes angasanensis | |