Pitra Akhriadi

Nepenthes jamban ( ni-PEN-theez JUM-bən, not * JAM-bən) is a tropical pitcher plant endemic to northern Sumatra. The specific epithet jamban is the Indonesian word for "toilet" and refers to the shape of the pitchers.

Nepenthes rigidifolia is a critically endangered tropical pitcher plant endemic to Sumatra, where it grows at elevations of 1,000–1,600 m above sea level. The specific epithet rigidifolia is formed from the Latin words rigidus (rigid) and folia (leaves), and refers to the plant's stiff, coriaceous leaf blades. Tahul-tahul has been recorded as a local vernacular name for this species.

Nepenthes naga is a tropical pitcher plant endemic to the Barisan Mountains of Sumatra. It is characterised by a forked sub-apical appendage on the underside of the lid and an undulate lid margin. The specific epithet naga is the Indonesian word for "dragon" and refers to the distinctive lid appendage of this species as well as the large size of its pitchers. The name also references local folklore, which tells of dragons occurring in this species's habitat in the past.

Nepenthes lingulata is a tropical pitcher plant endemic to northern Sumatra. The species is characterised by the highly developed appendage present on the underside of the lid. The specific epithet lingulata is derived from the Latin word lingula, meaning "small tongue", and refers to this unique morphological feature.

Nepenthes taminii is a tropical pitcher plant endemic to Sumatra.