Nepenthes angasanensis

Nepenthes angasanensis is a tropical pitcher plant species endemic to Sumatra, where it grows at an altitude of to above sea level. 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".
The specific epithet refers to Mount Puncak Angasan, from which the type specimen was collected. No forms or varieties of "N. angasanensis" have been described.
Taxonomy.
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.
Natural hybrids.
The following natural hybrids involving "N. angasanensis" have been recorded.