Botanists Matthew Jebb and Martin Cheek suggest that N. macrophylla is related to , a species endemic to Palawan in the Philippines.Schlauer, J. 2000. Carnivorous Plant Newsletter 29(2): 53.Cheek, M.R. & M.H.P. Jebb 1999. Nepenthes (Nepenthaceae) in Palawan, Philippines. Kew Bulletin 54(4): 887–895.
