Nepenthes angasanensis

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Nepenthes angasanensis
Nepenthes angasanensis.jpg
Nepenthes angasanensis holotype (Salmon & Maulder 234372).
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]
Nepenthes densiflora distribution.png
Distribution of N. angasanensis.
Synonyms

Nepenthes angasanensis /nˈpɛnθz ˌæŋɡəsəˈnɛnsɪs/ is a tropical pitcher plant species endemic to Sumatra, where it grows at an altitude of 2,200 metres (7,200 ft) to 2,800 metres (9,200 ft) above sea level.[6] 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.[7]

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.

Taxonomy[edit]

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 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 / cm² (1900 per sq in) 150-180 / cm² (1000 to 1200 per sq in) 200-250 / cm² (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.[8]



unnamed

N. gracilis



N. reinwardtiana



unnamed


N. tobaica


     79%

N. angasanensis



N. mikei







Natural hybrids[edit]

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

References[edit]

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

External links[edit]