Nepenthes angasanensis
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| Nepenthes angasanensis | ||||||||||||||
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 Nepenthes angasanensis holotype (Salmon et Maulder 234372).
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| Nepenthes angasanensis Maulder, D.Schub., B.R.Salmon & B.Quinn (1999) |
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 Distribution of N. angasanensis.
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Nepenthes angasanensis (pronounced /nəˈpɛnθiːz ɑːŋɡɑːsɑːnɛnsɪs/, Latin: Angasan = a region in Aceh, -ensis = from) 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.
No forms or varieties of N. angasanensis have been described.
[edit] Taxonomy
| Character | N. angasanensis | N. mikei | N. tobaica |
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| 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.[1]
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[edit] Natural hybrids
The following natural hybrids involving N. angasanensis have been recorded.
- N. angasanensis × N. densiflora[1]
[edit] References
- Clarke et al. (2000). Nepenthes angasanensis. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006.
- Salmon, B. & R. Maulder 1999. Notes on Nepenthes from Northern Sumatra. Carnivorous Plant Newsletter 28(1): 14–18.
Miscellaneous: Nepenthes taxonomy • Nepenthes infauna
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