In addition, the mouth of N. inermis × N. talangensis is raised towards the back as opposed to being horizontal. In 2001, Kurata described this hybrid as a new species, N. pyriformis. Clarke rejected this interpretation in his monograph Nepenthes of Sumatra and Peninsular Malaysia, published the same year. Clarke found that the type specimen of N. pyriformis, Kurata & Mikil 4230 NDC, matches the appearance of N. inermis × N. talangensis "in most respects". Other hybrids Where their ranges overlap, N. inermis is also known to hybridise with N. singalana and N. spathulata. Notes a.Bünnemeijer 5522 was collected on September 7, 1918, on Mount Talang at . It includes male floral material and is deposited at the Bogor Botanical Gardens (formerly the Herbarium of the Buitenzorg Botanic Gardens) in Java. b.Bünnemeijer 5749 was collected on November 16, 1918, on Bukit Gombak at . It is deposited at the Bogor Botanical Gardens and Herbarium Lugduno-Batavum in Leiden, Netherlands. The material does not consist of flowers or fruits. It was labeled with the vernacular name galoe-galoe antoe. c.Bünnemeijer 5747 was collected on November 16, 1918, on Bukit Gombak at . It is deposited at the Bogor Botanical Gardens and does not consist of flowers or fruits. It was labeled with the vernacular name galoe-galoe antoe. d.Bünnemeijer 9695 was collected on April 26, 1920, on Mount Kerintji at . It is deposited at the Bogor Botanical Gardens and does not consist of flowers or fruits. It was labeled with the vernacular name kandjong baroek. In 1920, Bünnemeijer explored Mount Kerintji between February 6 and May 12, before passing the Barisan Range on May 20 and leaving Kerintji Valley. e.The original Latin description of N. inermis reads: Folia mediocria sessilia, lamina spathulato-lanceolata, nervis longitudinalibus utrinque c. 3, basi caulis partem 1/2-1/3 amplectente, vagina 0 ; ascidia rosularum et inferiora ignota ; ascidia superiora parva, parte inferiore tubulosa v. paulum ventricosa, supra medium ampla infundibuliformia, ore expanso, peristomio fere 0, operculo angustissime cuneato, facie inferiore plana ; inflorescentia racemus parvus pedicellis inferioribus 4-8 mm longis, omnibus 1-floris ; indumentum iuventute tenue adpressum, denique in ascidiis sub ore et in inflorescentiis permanens. References Further reading Clarke, C. 2013. What Can Tree Shrews Tell Us about the Effects of Climate Change on Pitcher Plants? [video] TESS seminars, 25 September 2013. Hernawati & P. Akhriadi 2006. A Field Guide to the Nepenthes of Sumatra. PILI-NGO Movement, Bogor.