Nepenthes species

Robinson, Alastair S., Golos, Michal R., Barer, Marc, Sano, Yosuke, Forgie, Jennifer J., Garrido, Diego, Gorman, Chandler N., Luick, Adi O., Mcintosh, Nick W. R., Mcpherson, Stewart R., Palena, Gregory J., Pančo, Ivan, Quinn, Brian D. & Shea, Jeff, 2019, Revisions in Nepenthes following explorations of the Kemul Massif and the surrounding region in north-central Kalimantan, Borneo, Phytotaxa 392 (2), pp. 97-126 : 102

Nepenthes species recorded on both Mt. Bagong and the Kemul Massif

Nepenthes reinwardtiana Miquel (1852: 168) and N. tentaculata Hooker (1873: 101) , both of which are widespread generalists over a range of elevations across Borneo ( Clarke 1997, Cheek & Jebb 2001), as well as an unusual form of N. lowii Hooker (1859: 420) , a species otherwise known from Sabah, northern Sarawak and Brunei, and noted for its mutualistic relationship with tree shrews ( Clarke et al. 2009, Clarke et al. 2010). Though the latter taxon was initially contemplated to represent the closely related N. ephippiata (from C. Kalimantan and E. Sarawak, Lee 2004) on account of its atypical pitcher orientation, the diagnostic ephippium (after which N. ephippiata is named) was found to be wholly absent from the climbing stems, while the pitcher waist and vestigial peristome are closer to N. lowii , and the appendages within the lid cavity are not consistently reduced to tubercles in all upper pitchers as in N. ephippiata . These almost intermediate characteristics are not surprising given the location of these peaks between the generally accepted ranges of N. ephippiata and N. lowii , although why there should be graduation towards one form or the other based on latitude is wholly unknown.