Nepenthes angasanensis
Nepenthes angasanensis holotype (Salmon & Maulder 234372).
Scientific classification Edit this 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)[2]
Distribution of N. angasanensis.
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.[1][7] 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.[8]

The specific epithet refers to Mount Puncak Angasan, from which the type specimen was collected.[2] No forms or varieties of N. angasanensis have been described.

Taxonomy

Differences between N. angasanensis, N. mikei and N. tobaica (Salmon & Maulder, 1999)
CharacterN. angasanensisN. mikeiN. tobaica
HabitProduces offshoots from underground rhizomesNo rhizomesNo rhizomes
SpurForkedFasciculateFiliform
Inner margin of peristomeTeeth to 1.5 millimetres (0.06 in) to 2 millimetres (0.08 in) longTeeth to 0.2 millimetres (0.01 in) to 0.4 millimetres (0.02 in) longTeeth < 0.2 millimetres (0.01 in)
Stem cross sectionCylindricalCylindricalCylindrical to obtusely triangular
BracteolesSometimes near base of lowest pedicel onlyHalf way up every pedicelAt base or slightly below pedicel attachment, few
Pitcher glands300 / cm² (1900 per sq in)150-180 / cm² (1000 to 1200 per sq in)200-250 / cm² (1300 to 1600 per sq in)
Pedicels1-flowered1-flowered2-flowered
Inflorescence (female)5.5 centimetres (2 in) to 12.5 centimetres (5 in) long, 9-17 flowers4 centimetres (2 in) to 8 centimetres (3 in) long, 4-10 flowers19.5 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.[9]

unnamed

N. gracilis

N. reinwardtiana

unnamed

N. tobaica

79%

N. angasanensis

N. mikei

Natural hybrids

The following natural hybrids involving N. angasanensis have been recorded.

References

  1. 1 2 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.
  2. 1 2 Salmon, B. & R. Maulder 1999. Notes on Nepenthes from Northern Sumatra. Carnivorous Plant Newsletter 28(1): 14–18.
  3. ↑ Jebb, M.H.P. & M.R. Cheek 1997. A skeletal revision of Nepenthes (Nepenthaceae). Blumea 42(1): 1–106.
  4. ↑ Cheek, M.R. & M.H.P. Jebb 2001. Nepenthaceae. Flora Malesiana 15: 1–157.
  5. ↑ Danser, B.H. 1940. A new Nepenthes from Sumatra. Bulletin du Jardin Botanique de Buitenzorg, Série III, 16: 268–271.
  6. ↑ (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.
  7. ↑ McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sumatra and Java. Redfern Natural History Productions, Poole.
  8. ↑ Schlauer, J. N.d. Nepenthes angasanensis. Carnivorous Plant Database.
  9. 1 2 Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
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