The taxonomical work of Danser (1928) was revised by Hermann Harms in 1936. Harms divided "Nepenthes" into three subgenera: "Anurosperma" Hooker.f. (1873), "Eunepenthes" Hooker.f. (1873) and "Mesonepenthes" Harms (1936) (Latin: "meso": middle; "middle" "Nepenthes"). The "Nepenthes" species found in the subgenera "Anurosperma" and "Mesonepenthes" differ from those in the "Vulgatae", where Danser had placed them. Harms included "N. rajah" in the subgenus "Eunepenthes" together with the great majority of other "Nepenthes"; "Anurosperma" was a monotypic subgenus, while "Mesonepenthes" contained only three species. He also created an additional clade, the "Distillatoriae" (after "N. distillatoria").