Nerz's field studies, coupled with observations of N. bongso made by Mr. and Mrs. DeWitte on Mount Singgalang in 1993, showed that the two taxa almost certainly represented distinct species. To confirm this and prepare a formal description, Nerz and Andreas Wistuba examined herbarium specimens of both taxa, including Bünnemeijer 5398, 5521, and 5748 bis, as well as material of N. bongso from Mount Merapi (Korthals s.n., the type specimen) and Mount Singgalang (Beccari 268). This research culminated in the formal description of N. talangensis by Nerz and Wistuba in the December 1994 issue of the Carnivorous Plant Newsletter. The authors designated Nerz 2501 as the holotype.