Pitcher Plants of the Old World
Most authors regard "N. eymae" as a distinct species and it has been treated as such in all major monographs on the genus, including Matthew Jebb and Martin Cheek's "A skeletal revision of "Nepenthes" (Nepenthaceae)" (1997) and "Nepenthaceae" (2001), as well as Stewart McPherson's "Pitcher Plants of the Old World" (2009). Nonetheless, some authors have expressed doubt that it merits distinction from "N. maxima" at the species level. In "Pitcher Plants of the Old World", McPherson wrote that "the specific status of "N. eymae" seems warranted since the two taxa ["N. eymae" and "N. maxima"] appear to occur both together and in isolated, self-sustaining communities". Whatever the status of this taxon, the vast majority of plants cultivated under the name "N. eymae" do not exhibit the abruptly contracted upper pitchers commonly associated with it.