Nepenthes aristolochioides /nɪˈpɛnθiːz ærɪˌstɒloʊkiˈɔɪdiːz/ is a tropical pitcher plant endemic to Sumatra , where it grows at elevations of 1800–2500 m above sea level. It has an extremely unusual pitcher morphology, having an almost vertical opening to its traps. [3] It is critically endangered by...