''Nepenthes angasanensis'' is a tropical

pitcher plant Pitcher plants are several different carnivorous plants which have modified leaves known as pitfall traps—a prey-trapping mechanism featuring a deep cavity filled with digestive liquid. The traps of what are considered to be "true" pitcher p ...

species

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to Sumatra, where it grows at an altitude of to above sea level.McPherson, S.R. & A. Robinson 2012. ''

Field Guide to the Pitcher Plants of Sumatra and Java This list of ''Nepenthes'' literature is a listing of major published works dealing with the tropical pitcher plants of the genus ''Nepenthes''. It includes specialised standalone publications and taxonomic monographs released as part of large ...

''. Redfern Natural History Productions, Poole. The status of this

taxon In biology, a taxon ( back-formation from '' taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular n ...

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 In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in ...

between '' N. densiflora'' and ''N. tobaica''.Schlauer, J.
''Nepenthes angasanensis''
Carnivorous Plant Database. The specific epithet refers to Mount Puncak Angasan, from which the

type specimen In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached. In other words, a type is an example that serves to anchor or centralizes th ...

was collected. No forms or varieties of ''N. angasanensis'' have been described.

Taxonomy

In 2001,

Charles Clarke Charles Rodway Clarke (born 21 September 1950) is a British Labour Party politician, who was the Member of Parliament (MP) for Norwich South from 1997 until 2010, and served as Home Secretary from December 2004 until May 2006. Early life T ...

performed a

cladistic analysis Cladistics (; ) is an approach to biological classification in which organisms are categorized in groups ("clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is typically shared derived chara ...

of the ''Nepenthes'' species of Sumatra and

Peninsular Malaysia Peninsular Malaysia ( ms, Semenanjung Malaysia; Jawi: سمننجڠ مليسيا), or the States of Malaya ( ms, Negeri-negeri Tanah Melayu; Jawi: نڬري-نڬري تانه ملايو), also known as West Malaysia or the Malaysian Peninsula, ...

using 70 morphological characteristics of each taxon. The following is a portion of the resultant

cladogram A cladogram (from Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to ...

, showing part of "Clade 6". The sister pair of ''N. angasanensis'' and ''N. mikei'' has 79% support.Clarke, C.M. 2001. ''

Nepenthes of Sumatra and Peninsular Malaysia ''Nepenthes of Sumatra and Peninsular Malaysia'' is a monograph by Charles Clarke on the tropical pitcher plants of Sumatra, Peninsular Malaysia, and their minor surrounding islands. It was published in 2001 by Natural History Publications (Bor ...

''. Natural History Publications (Borneo), Kota Kinabalu.

Natural hybrids

The following natural hybrids involving ''N. angasanensis'' have been recorded. *''N. angasanensis'' × '' N. densiflora''

References

* * Hernawati & P. Akhriadi 2006. ''

A Field Guide to the Nepenthes of Sumatra This list of ''Nepenthes'' literature is a listing of major published works dealing with the tropical pitcher plants of the genus ''Nepenthes''. It includes specialised standalone publications and taxonomic monographs released as part of large ...

''. PILI-NGO Movement, Bogor.

External links

Photographs of ''N. angasanensis''
at the Carnivorous Plant Photofinder {{Nepenthes Carnivorous plants of Asia angasanensis Endemic flora of Sumatra Plants described in 1999