in related species such as N. inermis. The pitchers of N. inermis function not only as pitfall traps but also as flypaper traps, with the sticky inner walls trapping flying insects above the surface of the fluid. A similar trapping method may be employed by N. jamban. Related species Nepenthes jamban belongs to a group of related Sumatran species that includes N. dubia, N. inermis, N. jacquelineae, and N. tenuis. It shares with these species features such as infundibulate pitchers which are wholly glandular on their inner surfaces, bracteate inflorescences, and sessile leaves. All of these Nepenthes produce very viscous pitcher fluid. Nepenthes jamban is thought to be most closely related to N. jacquelineae. Both taxa have a narrow lid and massive nectar glands, a trait unique to these two species. However, the glands of N. jacquelineae may be even larger (≤1.5 mm wide). In addition, the two species can be easily distinguished on the basis of peristome morphology and floral characteristics. N. jamban is not as robust as N. jacquelineae and lacks the greatly expanded peristome that is so characteristic of that species. Furthermore, N. jamban differs in having longer and one-flowered partial peduncles, and a narrower lid. Natural hybrids A natural hybrid involving N. jamban and N. lingulata has been recorded. In 2009, Adrian Y. Wartono observed a putative cross between N. dubia and N. jamban in an area where these two species grew with N. lingulata and N. rhombicaulis. Notes a.The original Latin description of N. jamban reads: N. jacquelineae simile sed peristomii operculo valde porcato neque lato expanso, ascidii super valde abrupte infundibuliformibun et pedicellis in toto uniflorius differt. — Typus: Lee, Hernawati, Akhriadi NP 433 (ANDA), Indonesia, Sumatera Utara, Bukit Barisan, south of Padang Sidempuan, 22 April 2005. References Carnivorous plants of Asia jamban Endemic flora of Sumatra Plants described in 2006