Nepenthes angasanensis
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Nepenthes angasanensis Template:IPAc-en is a tropical pitcher plant species endemic to Sumatra, where it grows at an altitude of Script error: No such module "convert". to Script error: No such module "convert". above sea level.[1][2] 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.[3]
The specific epithet refers to Mount Puncak Angasan, from which the type specimen was collected.[4] 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 Script error: No such module "convert". to Script error: No such module "convert". long | Teeth to Script error: No such module "convert". to Script error: No such module "convert". long | Teeth < Script error: No such module "convert". |
| 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) | Script error: No such module "convert". to Script error: No such module "convert". long, 9–17 flowers | Script error: No such module "convert". to Script error: No such module "convert". long, 4–10 flowers | Script error: No such module "convert". to Script error: No such module "convert". 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.[5]
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Natural hybrids
The following natural hybrids involving N. angasanensis have been recorded.
- N. angasanensis × N. densiflora[5]
References
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- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Sumatra and Java. Redfern Natural History Productions, Poole.
- ↑ Schlauer, J. <templatestyles src="Template:Tooltip/styles.css" /> N.d. Script error: No such module "Check for unknown parameters". Nepenthes angasanensis. Carnivorous Plant Database.
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ a b Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
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- Template:Cite iucn
- 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
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