The next detailed treatments of "N. bellii" appeared in Matthew Jebb and Martin Cheek's 1997 monograph, "A skeletal revision of "Nepenthes" (Nepenthaceae)", and their 2001 revision, "Nepenthaceae". In the latter publication, Cheek and Jebb noted that little ecological data was known about the species and that it was represented in herbaria by only the two type collections ("Kondo 11514" and "Kurata & Toyoshima 1128") at the time. Stewart McPherson's 2009 monograph, "Pitcher Plants of the Old World", presented an updated description and colour habitat photographs of "N. bellii".