 "Nepenthes malimumuensis" can be distinguished from "N. sumagaya" by its upper pitcher wings, that are reduced to ribs or not apparent, having four-five nerves on either side of the midrib, and the lid appendage is reduced to a keel, whereas the latter's upper pitcher wings are occasionally present in some pitchers close to peristome, having 1-2 nerves on either side of the midrib, and lid appendage are occasionally present.The specific epithet "malimumuensis" denotes that the species was discovered from Mt.Malimumu.