or recovering secondary vegetation (such as previously logged dipterocarp forest). Towards the upper end of its altitudinal range, N. eymae is found among the ridge and summit vegetation of upper montane forest. The species occurs in both shaded and exposed sites, but grows best in the latter. Nepenthes eymae has no confirmed natural hybrids, although introgression may take place where this species is sympatric with N. maxima. The conservation status of N. eymae is listed as Least concern on the IUCN Red List, based on an assessment carried out in 2018. In 2009, Stewart McPherson wrote that the species is "widespread and locally abundant" across its range and that most populations are "remote and not seriously threatened at present". Nepenthes eymae is known to occur in one protected area (Morowali Nature Reserve), although the full extent of its range is unknown. Carnivory Nepenthes eymae produces an extremely thick, mucilaginous pitcher fluid that coats the entire inner surface of the traps in a thin film. This is seen in cultivated plants as well and is most prominent in upper pitchers, which must contend with the action of the wind. These pitchers appear to function at least in part as flypaper traps, with the sticky inner walls trapping small flying insects above the surface of the fluid. The prey then gradually slide down into the base of the pitcher where they are digested. This trapping method was noted by Peter D'Amato in 1993, who observed that, in cultivated plants, lower pitchers were more successful at catching ants than were upper pitchers. A 2011 study that used cultivated material of N. eymae recorded a mean digestive fluid relaxation time of 0.096 seconds (± 0.000) for this species. As for the majority of studied highland Nepenthes (but not lowlanders), this value differed significantly (P < 0.001) from that of distilled water, leading the authors to categorise N. eymae as a viscoelastic species. Similarly viscous pitcher fluid is found in the group of closely allied Sumatran species that includes N. aristolochioides, N. dubia, N. flava, N. inermis, N. jacquelineae, N. jamban, N. talangensis, and N. tenuis. These species all share infundibular pitchers. Related species Nepenthes eymae belongs to the loosely defined "N. maxima complex", which also includes, among other species, N. boschiana, N. chaniana, N. epiphytica, N. faizaliana, N. fusca, N. klossii, N. maxima, N. platychila, N. stenophylla, and N. vogelii. Nepenthes eymae is very