The genera Erythrochilus Reinw. ex Blume (or Erythrochylus Reinw. ex Blume, an orthographic variant) and Quadrasia Elmer is generally included into this genus.
Adolph Daniel Edward Elmer recorded a plant from Mount Pulgar (now known as Thumb Peak) matching the description of N. deaniana.
A certain "Nepenthes sibuyanensis Elm." appears in the December 29, 1911 issue of Leaflets of Philippine Botany, in an article by Adolph Daniel Edward Elmer on the figs of Sibuyan.
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