Taxonomy
Nepenthes hispida is very similar to the closely related N. hirsuta and some taxonomists contest its status as a separate species. It is also similar to N. macrovulagris, from which it differs in several aspects of pitcher and leaf morphology.
In his 1928 monograph, "The Nepenthaceae of the Netherlands Indies", B. H. Danser reduced N. hispida to a synonym of N. hirsuta, writing "N. hispida Beck is placed among the synonyms on the authority of Macfarlane, though the description gives another idea". Matthew Jebb and Martin Cheek restored N. hispida to species status in 1997, citing the amplexicaul-decurrent leaf base and indumentum as significant features that distinguish it from N. hirsuta. It has been suggested that N. hirsuta and N. hispida are extreme variants of the same species, as there exist intergrades between both taxa.
Matthew Jebb and Martin Cheek suggest that N. hispida is related to N. philippinensis, a species endemic to Palawan in the Philippines.
In his Carnivorous Plant Database, taxonomist Jan Schlauer treats N. hispida as a heterotypic synonym of N. hirsuta.
Read more about this topic: Nepenthes Hispida