Pitcher Plants of the Old World
British geographer Stewart McPherson published an updated description of the species in his 2009 monograph, "Pitcher Plants of the Old World". The book also covered the closely related undescribed taxon "N." sp. Sulawesi, which McPherson had observed with Greg Bourke in 2007. "Nepenthes" sp. Sulawesi was described as "N. nigra" in McPherson's 2011 work, "New Nepenthes".