Nepenthes angasanensis
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| Nepenthes angasanensis | |
|---|---|
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| Nepenthes angasanensis holotype (Salmon & Maulder 234372). | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Nepenthaceae |
| Genus: | Nepenthes |
| Species: | N. angasanensis |
| Binomial name | |
| Nepenthes angasanensis | |
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| 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.
| 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.[9]
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