I prepared Pitcher Plants of the Old World in response to the lack of available information on dozens of species of Nepenthes. Since many species of Nepenthes are not in cultivation, and also because there is often confusion concerning those that are, I resolved to study and photograph each species of Nepenthes and Cephalotus in the wild, in order to document each adequately. After graduating from university in 2006 at the age of 23, I began three years of intense research focusing on Nepenthes and Cephalotus, and spent a cumulative total of eighteen months in the field. Over the last three years, I climbed over one hundred mountains across Southeast Asia in search of species of Nepenthes. Many of these journeys were relatively simple, lasting just a few days or less. Others required more extensive effort, and in a few cases, I spent more than one week to find a single Nepenthes taxon.
This is to date the only publication dealing with the genus Nepenthes throughout its geographical range. He [McPherson] humbly refers the reader to other taxonomic works, but these are all regional treatments. The level of information provided on all the species of Nepenthes is outstanding and has no precedent.
^Robinson, A., J. Nerz, A. Wistuba, M. Mansur & S. McPherson 2011. Nepenthes lamii Jebb & Cheek, an emended description resulting from the separation of a two-species complex, and the introduction of Nepenthes monticola, a new species of highland pitcher plant from New Guinea. In: McPherson, S.R. New Nepenthes: Volume One. Redfern Natural History Productions, Poole. pp. 522–555.
^Nerz, J., A. Wistuba, C.C. Lee, G. Bourke, U. Zimmermann & S. McPherson 2011. Nepenthes nigra, a new pitcher plant from Central Sulawesi. In: McPherson, S.R. New Nepenthes: Volume One. Redfern Natural History Productions, Poole. pp. 468–491.
^Gronemeyer, T., A. Wistuba, V. Heinrich, S. McPherson, F. Mey & A. Amoroso 2010. Nepenthes hamiguitanensis (Nepenthaceae), a new pitcher plant species from Mindanao Island, Philippines. In: S.R. McPherson Carnivorous Plants and their Habitats. Volume 2. Redfern Natural History Productions, Poole. pp. 1296–1305.