List of Nepenthes natural hybrids

This list of "Nepenthes" natural hybrids is a comprehensive listing of all recorded natural hybrids involving species of the carnivorous plant genus "Nepenthes". Hybrids that are not endemic to a given region are marked with an asterisk.
By distribution.
Borneo.
"Nepenthes" natural hybrids recorded from Borneo.
Endemic species with no known natural hybrids:
"Nepenthes hurrelliana" and "N. murudensis" are of putative hybrid origin, but are considered species by most taxonomists, as they form stable, fertile populations independent of their original parent species. The same could be said for stable hybrids such as "N × kinabaluensis". Indeed, species status has been proposed for this taxon in the past.
Sumatra.
"Nepenthes" natural hybrids recorded from Sumatra.
Endemic species with no known natural hybrids:
Philippines.
"Nepenthes" natural hybrids recorded from the Philippines. The "N. alata" hybrids listed below involve "N. alata" in the broad sense ("sensu lato"); this polymorphic taxon has recently been split into a large number of daughter species that now form the so-called ""N. alata" group".
In addition, certain plants from Mount Hamiguitan are likely to represent crosses involving "N. hamiguitanensis", "N. justinae" (previously identified as "N. mindanaoensis"), "N. micramphora", and "N. peltata".
Endemic species with no known natural hybrids:
"Nepenthes petiolata" may itself have evolved from a cross between "N. alata" and "N. truncata". It has been suggested that "N. extincta" might represent a natural hybrid between "N. merrilliana" and "N. mindanaoensis", as both of these species grow near the type locality of "N. extincta" and share many morphological features with it.
Plants from Mount Hamiguitan that were originally thought to represent the natural hybrid "N. micramphora" × "N. peltata" are now recognised as belonging to a distinct species of possible hybridogenic origin, "N. hamiguitanensis".
Peninsular Malaysia and Singapore.
"Nepenthes" natural hybrids recorded from Peninsular Malaysia and Singapore.
Two natural hybrids have been recorded from Singapore: "N. × hookeriana" and "N. × trichocarpa". As such, all three species from Singapore are known to hybridise.
Sulawesi.
"Nepenthes" natural hybrids recorded from Sulawesi.
Endemic species with no known natural hybrids:
Indochina.
"Nepenthes" natural hybrids recorded from Indochina. For the purpose of this list, the area encompasses Cambodia, Laos, Myanmar, Thailand, and Vietnam.
In addition, infraspecific hybrids between "N. mirabilis" var. "globosa" and "N. mirabilis" var. "mirabilis" are known to occur.
Endemic species with no known natural hybrids:
New Guinea and the Maluku Islands.
"Nepenthes" natural hybrids recorded from New Guinea, the Maluku Islands, and surrounding islands.
Endemic species with no known natural hybrids:
Australia.
"Nepenthes" natural hybrids recorded from Australia. 
Complex hybrids involving all three species are also common.
All three species from Australia are known to hybridise.
Outlying areas.
There are six additional species endemic to areas other than those listed above. These are:
Of these, the only species that could conceivably hybridise in the wild are "N. madagascariensis" and "N. masoalensis". Although the ranges of the two species used to meet near Cape Masoala, no natural hybrids have ever been recorded.