NEPENTHES HYBRIDS AND CULTIVARS REDUCED TO LOWEST TERMS

For example: N. ((mira x alba) x (alba x mira)) x mira becomes N. alba x mira.
If you have hybrid or cultivar names to add, feel free to let me know.
Main sources: Carnivorous Plant Database; International Carnivorous Plant Society;
Carnivorous Plant Photo Finder; Leilani's Grex List. Plus various nurseries.
I skipped the "? x ?" and "parent x ?". Grex names are listed as cultivars.

Use the
Carnivorous Plant Database: to check the legitimacy of a name; if a name appears more than once; if you see a question mark.
All with a pinch of salt, because many hybrids have a dubious parentage.
The epithets alata and thorelii are between double quotes because there are doubts about those two names today, let alone fifty or a hundred years ago, when the hybrid was made.
Needless to say, the Indochinese species are treated according to this page.
See the notes at the bottom of the page for more comments.

"alata" x albomarginata x veitchii

Cultivars: Falcon.

"alata" x ampullaria

Cultivars:
Ron Determann.

"alata" x ampullaria x gracilis x khasiana x rafflesiana x ventricosa

Cultivars:
Michael Lee.

"alata" x bellii x merrilliana

Cultivars: Nanbara.

"alata" x boschiana x spathulata

Cultivars: Dr. Bodie.

"alata" x burkei

Cultivars:
Issey.

"alata" x clipeata x ventricosa

Cultivars: Aurora.

"alata" x dubia x ventricosa

Cultivars: St. Marcian.

"alata" x gracilis x khasiana

Cultivars: Nakaccho (?).

"alata" x gracilis x khasiana x maxima

Cultivars: Kihachijo (?).

"alata" x gracillima

Hybrids:
gracillata.

"alata" x khasiana x maxima

Cultivars: Kihachijo (?).

"alata" x khasiana x maxima x northiana x "thorelii"

Cultivars: Eldon Lee.

"alata" x khasiana x sanguinea

Cultivars: St. Brice.

"alata" x khasiana x "thorelii" x ventricosa

Cultivars: Lilli.

"alata" x khasiana x ventricosa

Hybrids: inexpecta, khasiata.

"alata" x maxima x merrilliana x northiana

Cultivars:
Ferny Koto.

"alata" x maxima x merrilliana x "thorelii" x ventricosa

Cultivars: Marian.

"alata" x maxima x northiana


Hybrids: arakawae

"alata" x maxima x northiana x "thorelii" x ventricosa

Cultivars: Forbidden Fruit.

"alata" x maxima x northiana x truncata

Cultivars:
Frau Anna Babl (?), Frieda Crisp (?), Marie (?), Nora (?).

"alata" x maxima x veitchii

Cultivars: St. Hedwig.

"alata" x maxima x ventricosa

Cultivars: Sincerity.

"alata" x merrilliana

Hybrids:
merrilliata.

"alata" x merrilliana x mirabilis

Cultivars: Tsangoya.

"alata" x merrilliana x rafflesiana

Cultivars:
Freely Koto.

"alata" x merrilliana x spathulata

Cultivars: March Hare.

"alata" x mira

Cultivars: Great Events.

"alata" x mirabilis

Hybrids: mirabilata.

"alata" x northiana

Cultivars: V. I. Vernadsky.

"alata" x ramispina x ventricosa

Cultivars: St. Daniel.

"alata" x reinwardtiana

Cultivars: Kamaha'o, Maka'ula.

"alata" x reinwardtiana x ventricosa

Cultivars: Maka.

"alata" x sanguinea x ventricosa

Cultivars: Elizabeth.

"alata" x spathulata

Cultivars: Fancy Fish.

"alata" x spathulata x veitchii

Cultivars: Regan.

"alata" x tentaculata x "thorelii" x tobaica x ventricosa

Cultivars: Diligence.

"alata" x "thorelii"

Cultivars: Yubama.

"alata" x "thorelii" x truncata x ventricosa

Hybrids: yarosis.

"alata" x "thorelii" x ventricosa

Hybrids: tinkerei.

"alata" x truncata

Hybrids: truncalata.
Cultivars: Kona, Sleeping Dragon, St. Conrad.

"alata" x truncata x veitchii x ventricosa

Cultivars: Menelaus.

"alata" x truncata x ventricosa

Cultivars: Loihi.

"alata" x veitchii

Cultivars: Zina.

"alata" x ventricosa

Hybrids: ventrata.
Cultivars: Alata Deroose, Kokkome, LeeAnn Marie, Zonal Koto (?).

albomarginata x eustachya x sanguinea

Cultivars: Epigaea.

albomarginata x eustachya x spathulata x spectabilis

Cultivars: Sunset.

albomarginata x maxima

Hybrids: albomax, curtisii.
Cultivars: Red Beauty.

albomarginata x maxima x stenophylla

Hybrids: higra.

albomarginata x maxima x stenophylla x "thorelii"

Cultivars: Claude Bramblett, Clyde Bramblett.

albomarginata x maxima x "thorelii"

Cultivars: Courage.

albomarginata x maxima x "thorelii" x veitchii

Cultivars: Kandy, St. Longinus.

albomarginata x northiana

Hybrids: cincta.
Cultivars: Marginal.

albomarginata x rafflesiana

Cultivars:
Saturn.

albomarginata x reinwardtiana

Hybrids:
ferrugineomarginata.

albomarginata x spathulata

Cultivars: Isis.

albomarginata x "thorelii"

Hybrids: masahiroi.

albomarginata x veitchii

Cultivars: Firecracker, Konak.

ampullaria x bellii

Cultivars: Bellero.

ampullaria x bellii x rafflesiana

Cultivars: Kyoko.

ampullaria x bicalcarata

Cultivars: Rapa.

ampullaria x bicalcarata x truncata

Cultivars: Bella.

ampullaria x distillatoria x gracilis x khasiana x rafflesiana

Hybrids:
boissiensis.

ampullaria x distillatoria x hirsuta x rafflesiana

Hybrids: formosa.

ampullaria x gracilis

Hybrids: trichocarpa, trichocarpa var. erythrosticta.

ampullaria x gracilis x khasiana x maxima x northiana x rafflesiana

Hybrids:
mixta var. superba.

ampullaria x gracilis x khasiana x mirabilis x rafflesiana

Hybrids:
pitcheri.

ampullaria x gracilis x khasiana x rafflesiana

Hybrids:
boissiensis, henryana, hibberdii, outramiana, superba, williamsii.
Cultivars: Rubra.

ampullaria x gracilis x khasiana x rafflesiana x sanguinea

Cultivars:
Ville de Rouen.

ampullaria x gracilis x khasiana x rafflesiana x sanguinea x ventricosa

Cultivars: Showa.

ampullaria x gracilis x khasiana x rafflesiana x "thorelii" x ventricosa

Cultivars:
Kalamity.

ampullaria x gracilis x maxima x northiana x rafflesiana x veitchii

Cultivars: Delightful Koto, Dignified Koto.

ampullaria x gracilis x rafflesiana

Cultivars: Ambrosial Koto.

ampullaria x hirsuta x rafflesiana

Hybrids: chelsonii, chelsonii var. excellens, chelsonii var. excelsa, edinensis, irregulata.
Cultivars: Director George T. Moore, Dr. D. C. Fairburn, Dr. Edgar Anderson, Gerald Ulrici, Henry Shaw, Joseph Cutak, Katharine Moore, Lieut. R. Bradford Pring, Nell Horner, St. Louis, Tokuyoshi Kondo.

ampullaria x khasiana x mirabilis x rafflesiana x sanguinea

Cultivars:
Tsujimoto.

ampullaria x khasiana x mirabilis x rafflesiana x "thorelii" x sanguinea

Cultivars:
Elfine Koto.

ampullaria x khasiana x rafflesiana

Cultivars:
Giddy Koto.

ampullaria x khasiana x rafflesiana x sanguinea

Cultivars:
Fickle Koto.

ampullaria x maxima x mirabilis x northiana x rafflesiana

Hybrids:
minamiensis.
Cultivars: Minami, Minami Triumph, Shinjiku, Shinjuku, Shinjuku Grandifolia.

ampullaria x maxima x mirabilis x northiana x rafflesiana x veitchii

Cultivars:
Eternal Koto.

ampullaria x maxima x mirabilis x northiana x rafflesiana x ventricosa

Cultivars:
Sanyo.

ampullaria x maxima x mirabilis x rafflesiana

Cultivars:
Dinkum Koto.

ampullaria x maxima x mirabilis x rafflesiana x "thorelii"

Cultivars:
Glorious Koto.

ampullaria x maxima x mirabilis x rafflesiana x veitchii

Hybrids: boisiana.

ampullaria x maxima x northiana x rafflesiana

Hybrids:
gojimae, nishijimae, shunkyuensis.
Cultivars: Koiwado.

ampullaria x maxima x rafflesiana x "thorelii"

Hybrids:
mathesonii.
Cultivars: Fine Koto.

ampullaria x mirabilis

Hybrids:
cutinensis, kuchingensis.
Cultivars: Clumpy, Green Bomb, Purple Night.

ampullaria x mirabilisorbiculata

Cultivars:
Majin Bu, Patong.

ampullaria x mirabilisorbiculata x rafflesiana

Cultivars: Laithai.

ampullaria x mirabilis x rafflesiana

Hybrids: anerleyensis, arnoldiensis, atrosanguinea, coccinea, compacta, cravenii, doradisiae, eyermannii, findlayana, hamiltoniana, hamiltonii, hookerae, lawrenceana, morganiae, morganiana, paradisae, patersonii, ratcliffiana, robusta, splendida, stewartii, wrigleyana, wrigleyana var. superba, wrigleyana var. viridescens.
Cultivars: Ebony Koto, Engaging Koto, Fumi, Glaring Koto, Kosobe, Mizuho Kondo, Oriental Rouge, Scarlet Splash.

ampullaria x mirabilis x rafflesiana x spectabilis

Cultivars: Nephthys, Pandora.

ampullaria x mirabilis x rafflesiana x stenophylla

Cultivars:
Forceful Koto.

ampullaria x mirabilis x rafflesiana x "thorelii"

Cultivars: 
Emotional Koto, Fervent Koto, Glazy Koto, Nasu.

ampullaria x mirabilis x rafflesiana x veitchii

Cultivars:
Divine Koto.

ampullaria x northiana

Cultivars: Takao, Yamana.

ampullaria x northiana x rafflesiana

Cultivars: Hiroko.

ampullaria x northiana x "thorelii"

Cultivars: Kayoko.

ampullaria x orbiculata

Cultivars: Big Bang, Dangnoi, Dark Moon, Khi Seechumpu, Pink Lipstick.

ampullaria x orbiculata x rafflesiana

Cultivars: Little Apple.

ampullaria x rafflesiana

Hybrids: amabilis, amesiana, elongata, excelsior, hookeri, hookeri var. elongata, hookeriana, hookeriana f. elongata, loddigesii.
Cultivars: Big Bertha, Decorous Koto, Hoeue Riana, Kashiwa, Kiso, Mercury, Saitoh, Susan, White Beauty.

ampullaria x rafflesiana x "thorelii"

Cultivars: Accentual Koto, Facetious Koto, Haguro.

ampullaria x "thorelii"

Cultivars: The Tick.

ampullaria x truncata

Cultivars: Venus.

ampullaria x veitchii

Hybrids: lesliei.

ampullaria x ventricosa

Cultivars: Bloody Mary, Lady Luck, Sachiko, Singapore Garden Tech.

andamana x orbiculata

Cultivars: Andaman Surf.

aristolochioides x densiflora x mira x spectabilis

Cultivars: Dreaming Artist.

aristolochioides x densiflora x spectabilis

Cultivars: Dreaming Angel.

aristolochioides x lowii

Cultivars: Aristocrat.

aristolochioides x mira

Cultivars: Involuntary Bliss.


aristolochioides x sanguinea x "thorelii"

Cultivars: Safari.

aristolochioides x sibuyanensis x talangensis x ventricosa

Cultivars: Jolly Twist.

aristolochioides x "thorelii" x ventricosa

Cultivars: Mimosa.

aristolochioides x truncata

Cultivars: Titan Angel.

bellii x clipeata

Cultivars: Shaleen.

bellii x dubia x ventricosa

Cultivars: Dormouse.

bellii x inermis x sibuyanensis

Cultivars: Enigma.

bellii x lowii x macrophylla

Cultivars: Trusmadi Belle.

bellii x maxima

Cultivars: Binky, Miyo.

bellii x maxima x northiana

Cultivars: Bellisimo.

bellii x sibuyanensis

Cultivars: Medusa.

bellii x spathulata

Cultivars: Spellbound.

bellii x spectabilis

Cultivars: Bella.

bellii x "thorelii"

Hybrids: fushimiensis.
Cultivars: Niwa.

bellii x truncata

Cultivars: Filipine Dragon.

bellii x ventricosa

Hybrids:
benkei, benkei var. inversa, whitneyi, whittaeyi.
Cultivars: Filipine Bells.

biak x lowii x macrophylla x "thorelii"

Cultivars: Before Sunrise, Lear.

biak x merrilliana

Cultivars: Momoka.

biak x ventricosa

Cultivars: St. Pacificus.

bicalcarata x gracilis

Hybrids: cantleyi.

bicalcarata x hirsuta

Cultivars: Hortulanus Otten.

bicalcarata x maxima x northiana x rafflesiana x veitchii

Cultivars: Nina Dodd.

bicalcarata x rafflesiana

Cultivars: Inevitable.

bicalcarata x truncata

Cultivars: Titan's Bounty.

bongso x gymnamphora

Cultivars: Flutura.

bongso x maxima

Hybrids: bongsima.

bongso x maxima x "thorelii"

Cultivars: Aponi, Gratitude.

bongso x spathulata

Cultivars: Melvino.

bongso x talangensis x ventricosa

Cultivars:
Petra.

bongso x ventricosa

Cultivars: Bongbong.

boschiana x campanulata x maximaorbiculata

Cultivars: Samsara.

boschiana x densiflora

Cultivars: Polar Prince.

boschiana x gymnamphora

Cultivars: Raven.

boschiana x lowii x veitchii

Cultivars: Red Ruffled.

boschiana x maxima x "thorelii" x veitchii

Cultivars: Candy Apple.

boschiana x singalana

Cultivars: Lorainne, Parasol.

boschiana x spectabilis x veitchii

Cultivars:
Song of Melancholy.

burbidgeae x rajah

Hybrids: alisaputrana.

burbidgeae x veitchii

Cultivars: Porcelana.

burkei x clipeata

Hybrids:
debbertii.

burkei x maxima x northiana

Cultivars: Hideki.

burkei x veitchii

Cultivars: Denarius.

campanulata x densiflora x "thorelii"

Cultivars: Destiny.

campanulata x maxima

Cultivars: Caladium.

campanulata x maxima x "thorelii"

Cultivars: Polydorus.

campanulata x spathulata

Cultivars: Carmen.

campanulata x spectabilis x "thorelii"

Cultivars: Hamakua, Hamakua Ninole.

campanulata x spectabilis x "thorelii" x truncata

Cultivars: Stillest Hour.

campanulata x tobaica

Cultivars: Red Princess.

campanulata x truncata

Cultivars: Squat Dragon.

campanulata x ventricosa

Cultivars: Menehune.

clipeata x maxima

Hybrids: debbertii.
Cultivars: Meteor.

clipeata x maxima x mirabilis x northiana x ventricosa

Cultivars: Clarabell.

clipeata x maxima x northiana

Cultivars: Hirakata.

clipeata x merrilliana

Cultivars: Lovelock.

clipeata x sanguinea

Cultivars: Fairyland.

clipeata x "thorelii"

Hybrids: cliperelii.

clipeata x truncata x veitchii x ventricosa

Cultivars: Sultan.

clipeata x veitchii

Cultivars:
J & B.

copelandii x dubia

Cultivars: Osiris.

copelandii x khasiana

Cultivars: St. Leonard.

deaniana x ventricosa

Cultivars: Yoyogi (?).

densiflora x maxima x "thorelii" x veitchii

Cultivars: Satisfaction.

densiflora x mira x spectabilis

Cultivars: Dream Mirror.

densiflora x mira x truncata

Cultivars: Six Maidens.

densiflora x ovata x spectabilis

Cultivars: Dream Oracle.

densiflora x robcantleyi x sanguinea

Cultivars: Secret Doom.

densiflora x robcantleyi x truncata

Cultivars: Titanic Doom.

densiflora x spathulata x "thorelii"

Cultivars: Anubis.

densiflora x spectabilis x talangensis

Cultivars: Dream of Triumph.

densiflora x spectabilis x truncata

Cultivars: Dreaming Tyrant.

densiflora x spectabilis x ventricosa

Cultivars: Dream of Victory.

densiflora x tobaica

Hybrids: angasanensis (?).

densiflora x truncata

Cultivars: Purple Dragon.

distillatoria x gracilis x hirsuta x maxima x northiana x rafflesiana

Hybrids:
hoelscheri.

distillatoria x gracilis x hirsuta x rafflesiana

Hybrids: rufescens.

distillatoria x gracilis x khasiana

Hybrids: atrosanguinea.

distillatoria x veitchii

Hybrids: 
cylindrica.

distillatoria x ventricosa

Hybrids: butcheri,
hybrida, sedenii.
Cultivars: Alta May.

dubia x gymnamphora

Cultivars: Fyodor.

dubia x khasiana x "thorelii" x ventricosa

Cultivars: Pea Cup.

dubia x maxima x "thorelii"

Cultivars: Triffid.

dubia x ventricosa

Cultivars: Parvana.

edwardsiana x villosa

Hybrids:
harryana.

ephippiata x eymae

Cultivars: Jmaxeypiata.


ephippiata x eymae x maxima x "thorelii"

Cultivars: Pennywise.

eustachya x veitchii

Cultivars: Urangan.

eymae x izumiae x jacquelineae

Cultivars: Miss Stephanie (?).

eymae x jacquelineae

Cultivars: Venturiana.

eymae x lowii x macrophylla

Cultivars: Midtown.

eymae x maxima x veitchii

Cultivars: Whisper.

eymae x rafflesiana x veitchii

Cultivars: Nicodemus.

eymae x truncata

Cultivars: Sulawesi Dragon.

eymae x veitchii

Cultivars: Sublime Beauty.

fusca x maxima

Cultivars: Gentle, Velvet.

fusca x maxima x "thorelii" x veitchii

Cultivars: Kohala, Ruby Alice.

fusca x maxima x veitchii

Cultivars: Fancy Tapestry, St. Galla.

fusca x spathulata x veitchii

Cultivars: Bach.

fusca x veitchii

Cultivars: Cemerlang.

glabrata x veitchii

Cultivars: Joanne Holland.

gracilis x hirsuta x rafflesiana

Hybrids: courtii,
hybrida var. elongata (?), hybrida var. elongata, rufescens.

gracilis x khasiana

Hybrids:
hybrida, hybrida var. maculata, hybrida var. typica, sedenea, sedenii, sedenii var. rubra.

gracilis x khasiana x mirabilis

Hybrids:
donnaniana, dormaniana, neufvilleana, seabrightii, siebrechtiana.

gracilis x khasiana x rafflesiana

Hybrids:
lyrata.

gracilis x khasiana x veitchii

Hybrids:
rubromaculata.

gracilis x macfarlanei

Hybrids: setiuensis.

gracilis x mirabilis

Hybrids: ghazallyana, grabilis, neglecta, sharifah-hapsahii (?).

gracilis x northiana

Hybrids: bauensis.
Cultivars: Nighttime Regal.

gracilis x truncata

Cultivars: Dark Giant, Ebony Giant.

gracilis x veitchii

Hybrids: grachii.

gracillima x gymnamphora x mikei

Cultivars: Raven, Sakura.

gracillima x inermis

Cultivars: Grey Mist.

gracillima x ventricosa

Hybrids: ventrillima.
Cultivars: Judith Soper.

gymnamphora x mikei

Hybrids: pangulubauensis.

gymnamphora x mikei x spectabilis

Cultivars: Snazz Chas.

hamata x talangensis

Cultivars: Bargara.

hamata x truncata

Cultivars: Predator.

hamata x truncata x ventricosa

Cultivars: Gloxinia.

hamata x ventricosa

Cultivars: Simon.

hirsuta x maxima x northiana

Cultivars: Spali, Supari.

hirsuta x maxima x rafflesiana x "thorelii"

Hybrids: weigneri.

hirsuta x maxima x spectabilis x veitchii

Cultivars: Bison.

hirsuta x mira x stenophylla

Cultivars: New Idol.

hirsuta x rafflesiana

Hybrids: balfouriana, courtii, dominiana, dominiana var. intermedia, dominii, dominii var. viridis, dominyea, hookeriana, intermedia, intermedia var. hybrida, nephelophyllum.

hirsuta x ramispina x ventricosa

Cultivars: Louisa.

hirsuta x spathulata x veitchii

Cultivars: Coco.

hirsuta x ventricosa

Hybrids: ventrisuta.

hurrelliana x ventricosa

Cultivars: Lebin.

inermis x talangensis

Hybrids: pyriformis (?).

inermis x ventricosa

Hybrids: ventrinermis.
Cultivars: Trina.

izumiae x truncata

Cultivars: Black Dragon.

khasiana x maxima x northiana

Cultivars: Fuso.

khasiana x maxima x northiana x sanguinea

Hybrids: balfouriana, reuthei.

khasiana x maxima x northiana x sanguinea x "thorelii"

Cultivars:
Aichi.

khasiana x maxima x sanguinea x "thorelii"

Cultivars: Rebo.

khasiana x maxima x sanguinea x veitchii

Cultivars: Ville de Rouen.

khasiana x maxima x "thorelii"

Hybrids: vandiana.
Cultivars: Noboriryu, St. Chad.

khasiana x maxima x ventricosa

Cultivars: Budda, Krishna, St. Gaya.

khasiana x merrilliana x sanguinea

Cultivars: Feverish Koto.

khasiana x mirabilis

Cultivars: Manny Herrera.

khasiana x mirabilis x "thorelii"

Cultivars: Kirstin Ammar,
Kristin Ammar.

khasiana x sanguinea

Hybrids:
mastersiana, mastersiana var. purpurea.

khasiana x sanguinea x spathulata

Cultivars: Delphinium.

khasiana x sanguinea x spathulata x spectabilis

Cultivars: Mauna Kea.

khasiana x sanguinea x "thorelii"

Cultivars: Facile Koto.

khasiana x sanguinea x tobaica

Cultivars: Evening Light.

khasiana x sanguinea x ventricosa

Cultivars: Mino'o.

khasiana x "thorelii"

Hybrids: sullivanii.
Cultivars: Adorable Fuso, Fabulous Koto, Feminine Koto.

khasiana x "thorelii" x ventricosa

Hybrids: andrewensis.
Cultivars:
Dwarf Peacock, Mary Cruz.

khasiana x ventricosa

Cultivars: Emmarene, Emmarene Savanah Rose, Savanah Rose.

lavicola x sanguinea

Cultivars: Secret Lust.

lavicola x ventricosa

Cultivars: Virtuous Lust.

lowii x macrophylla

Hybrids:
trusmadiensis.

lowii x macrophylla x maxima

Cultivars: Mardi Gras.

lowii x macrophylla x maxima x orbiculata

Cultivars: Autumn Wine.

lowii x macrophylla x merrilliana x "thorelii" x truncata

Cultivars: Julia.

lowii x macrophylla x sibuyanensis x truncata

Cultivars: Romans.

lowii x macrophylla x spectabilis x "thorelii"

Cultivars: Pastoral.

lowii x macrophylla x "thorelii" x ventricosa

Cultivars: Immaculate.

lowii x macrophylla x truncata

Cultivars: Uluru.

lowii x macrophylla x ventricosa

Cultivars: Sabre.

lowii x maxima x ventricosa

Cultivars: Ipuensis.

lowii x northiana x truncata x veitchii

Cultivars: Titan's Lament.

lowii x sanguinea x ventricosa

Cultivars: Secret Battle.

lowii x spectabilis

Cultivars: H. R. Giger.

lowii x truncata

Cultivars: Alien.

lowii x veitchii

Cultivars: Odyssey.

lowii x ventricosa

Hybrids: briggsiana.
Cultivars:
Atlanta Giant, Peter D'Amato, Starfire, The Succubus, Virtuous Battle.

lowii x villosa

Hybrids:
lowilosa.

mapuluensis x ventricosa

Hybrids: mapulucosa.

maxima x merrilliana x northiana

Cultivars:
Dashy Koto, Festal Koto, Pompey.

maxima x merrilliana x sibuyanensis x truncata

Cultivars: Goliath.

maxima x mira

Cultivars: Maximum.

maxima x mirabilis x northiana

Hybrids: 
leessii.
Cultivars: Lang, Mark Lang, Okuyama.

maxima x mirabilis x northiana x rafflesiana x "thorelii" x veitchii

Hybrids:
hareliana, hareliana var. alba, hareliana var. vittata.
Cultivars: Alba, Boca Rose, Prosperity, Red Skeleton, Rouge, Vittata.

maxima x mirabilis x northiana x rafflesiana x veitchii

Cultivars:
Easeful Koto, Kei (?), Midori (?), Mihara.

maxima x mirabilis x northiana x "thorelii"

Cultivars:
Aeneas, Cathy Jo, Idyllic Koto, Île de France.

maxima x mirabilis x northiana x "thorelii" x veitchii

Cultivars: Pulelehua.

maxima x mirabilis x northiana x tobaica x "thorelii"

Cultivars: Soothsayer.

maxima x mirabilis x "thorelii"

Cultivars:
Buttons, Glossy Koto.

maxima x northiana

Hybrids: allottii, behnickii, cisoensis, fournieri, fukubae, gautieri, goebelii, grandis, katagirii, kikuchiae, koisoensis, ladenburgii, longicaudata, maria-louisa, mercieri, mixta, mixta var. sanguinea, neufvilleana, northisii, oisoensis, roedigeri, russellii, sakuradae, simonii, staemmleri.
Cultivars: David Parkyn, Hamakumiko (?), Koiwado, Lupalupa, Marpessa, Miranda, Mixta, Oiso, Sanguinea, Sanderiana, Sanglant, Sens (?), Superba, Ted Payne.

maxima x northiana x rafflesiana

Hybrids: toyotamaensis, toyotamaensis var. inversa.

maxima x northiana x rafflesiana x spectabilis x tobaica x veitchii

Cultivars: Esther.

maxima x northiana x rafflesiana x "thorelii" x veitchii

Cultivars: Bizen, Elaborative Koto, Foremost Koto, Fruity Koto, Okazaki, Prosperity, Tametomo.

maxima x northiana x rafflesiana x veitchii

Hybrids: dyeriana, fukakusana, goettingensis, ikedae, picturata, princeps, shiojii.
Cultivars: Benign Koto, F. W. Moore, Kametodo, Mizuho, Mojito, Sir William Thiselton Dyer.

maxima x northiana x sanguinea

Cultivars: Lewis Bradbury.

maxima x northiana x spathulata x veitchii

Cultivars: Charity.

maxima x northiana x stenophylla x "thorelii"

Hybrids: davineana, ryaniana.

maxima x northiana x "thorelii"

Hybrids: aigae, dianiana, excellens, excellens var. superba, redlanderi.
Cultivars: Akaba, East Everglades, Hamafuefuki, Hiramasa, Immobile Koto, Jessica Laureen, Kalakoa, Nagoya, Nagoya Variegata, Ogo, Reserve, Rex, Superba, Suzue Kondo.

maxima x northiana x "thorelii" x veitchii

Cultivars:
Bruce Bednar, David Parkyn, Nago, Pharaoh.

maxima x northiana x veitchii

Hybrids:
caroli-schmidtii, deslogesii, gameri, krausii, paulii, petersii, ratzii, remillensis, siebertii, vallierae.
Cultivars: Clematis, Menarabe, Remilly.

maxima x northiana x ventricosa

Hybrids:
madisonii.
Cultivars: Kishino.

maxima x rafflesiana x "thorelii"

Cultivars: Forsythia.

maxima x ramispina x "thorelii"

Cultivars: St. Lidwina.

maxima x reinwardtiana x "thorelii"

Hybrids: harrisiana.

maxima x sanguinea

Hybrids: atropurpurea, nobilis.
Cultivars: Diomedes, Dr. John Macfarlane, Ruby.

maxima x sanguinea x "thorelii"

Cultivars: Ali'i.

maxima x sanguinea x veitchii

Cultivars: Patience.

maxima x sibuyanensis

Cultivars: Gothica.

maxima x spathulata

Hybrids: spaxima.
Cultivars: Temperance.

maxima x spathulata x spectabilis

Hybrids:
maxitiana.

maxima x spathulata x spectabilis x veitchii

Cultivars: Cordelia, Sprinkles.

maxima x spathulata x "thorelii"

Cultivars: Hecuba.

maxima x spathulata x veitchii

Cultivars: Riddler.

maxima x spectabilis x "thorelii"

Cultivars: Kindness, Silence.

maxima x stenophylla

Hybrids:
thevetii (?).

maxima x stenophylla x "thorelii"

Cultivars: Frosty Koto, Jack Finney, Santa Mira.

maxima x talangensis

Cultivars: Exotic Lady, Goblin, Jeanie Babe, Lady Pauline.

maxima x talangensis x "thorelii" x tobaica

Cultivars: Dark Night.

maxima x talangensis x tobaica

Cultivars: Black Sands, Kalapana, Puna, Queen's Bath, Wanderer.

maxima x talangensis x ventricosa

Cultivars: Mimi, Mimi's Kiss.

maxima x tentaculata x "thorelii"

Cultivars: Freder.

maxima x tentaculata x "thorelii" x ventricosa

Cultivars: Maria.

maxima x "thorelii"

Hybrids:
masamiae, splendiana.
Cultivars: Balmy Koto, Ecstatic Koto, Festive Koto, Hyogo (?), Rokko, Splendid Diana.

maxima x "thorelii" x truncata

Cultivars: Redneck, St. Rufinis.

maxima x "thorelii" x truncata x ventricosa

Cultivars: Hualalai, Punahele.

maxima x "thorelii" x veitchii

Cultivars: Fantasy, Troth.

maxima x "thorelii" x ventricosa

Hybrids: sheridaniana.
Cultivars: Mata Hari, St. Mercury, Sunset Songs.

maxima x tobaica x veitchii

Cultivars: Cleopatra.

maxima x truncata

Cultivars: Marbled Dragon.

maxima x veitchii

Hybrids: allardii, curtisii var. hybrida (?), tiveyi, wittei (?).
Cultivars: Sarawak Red, Yakkome.

maxima x ventricosa

Cultivars: Maiden of Victory, Princess Ipu, Princess Mashed Potatoes, Red Leopard.

merrilliana x sanguinea

Cultivars: Laputa.

merrilliana x spathulata

Cultivars: Paris.

merrilliana x "thorelii"

Cultivars: Dainty Koto.

merrilliana x truncata

Cultivars: Amazonias, Caesar.

merrilliana x truncata x veitchii

Cultivars: Caesarion.

mira x spectabilis x tobaica

Cultivars: Trallians.

mira x truncata

Cultivars: Regal Dragon, Titan's Mirror.

mira x veitchii

Cultivars: Velvet Mirror.

mira x ventricosa

Cultivars: Fat Mira, Princess, Princess William of Wales, Virtue's Mirror.

mirabilis x northiana

Cultivars:
Holly, Lucy, Royal Helmet.

mirabilis x rafflesiana

Hybrids: hookerae, hookerea.
Cultivars: James Taplin, Nagamogo, Nakanogo.

mirabilis x spathulata

Cultivars: Kimimela.

mirabilis x "thorelii"

Hybrids: lecouflei.
Cultivars: Effulgent Koto, Hachijo.

mirabilis x "thorelii" x ventricosa

Hybrids:
blakei.

muluensis x tentaculata

Hybrids: sarawakiensis.

northiana x sanguinea

Cultivars: Gloire des Ardennes.

northiana x veitchii

Cultivars: Tomomi.

northiana x ventricosa

Cultivars: Syurga.

orbiculata x rafflesiana

Cultivars: Xiriana.

ovata x spathulata

Cultivars: Bastido.

ovata x ventricosa

Hybrids: carunculosa.

peltata x rajah

Cultivars: Leviathan.

peltata x truncata

Cultivars: Red Phantom.

petiolata x truncata

Hybrids: brevicaulis.

rafflesiana x sanguinea

Cultivars: Barnabus.

rafflesiana x sibuyanensis

Cultivars: Suki.

rafflesiana x spathulata

Cultivars: Vanessa.

rafflesiana x spathulata x spectabilis

Hybrids: raffletiana.

rafflesiana x stenophylla

Cultivars: Formal Koto (?).

rafflesiana x "thorelii"

Cultivars: Amy Michelle, Delectable Koto, Shamenbana.

rafflesiana x "thorelii" x ventricosa

Hybrids: wilsonii.

rafflesiana x veitchii

Hybrids: dicksoniana.
Cultivars: Menarik.

rafflesiana x ventricosa

Cultivars: Asahi.

rajah x villosa

Hybrids: kinabaluensis.

ramispina x sanguinea x ventricosa

Cultivars: Frosty.

ramispina x spathulata x veitchii x ventricosa

Cultivars: Eglantine.

ramispina x ventricosa

Cultivars: Black Knight, Lantern Alata, Linda,
Rebecca Soper.

reinwardtiana x singalana

Hybrids: singatiana.

robcantleyi x talangensis x truncata

Cultivars: Torrential Testament.

robcantleyi x ventricosa

Cultivars:
Queen Malani, Rob.

sanguinea x sibuyanensis

Cultivars: Shadow.

sanguinea x spectabilis

Cultivars: Secret Savior, Secret Sin.

sanguinea x tobaica

Cultivars: Shivas Regal.

sanguinea x truncata

Cultivars: Patroklos, Secret Tyrant.

sanguinea x veitchii

Hybrids: excelsa.

sanguinea x ventricosa

Cultivars: Secret Victory.

sibuyanensis x spectabilis x tobaica

Cultivars: Blessed Isles.

sibuyanensis x truncata

Cultivars: Dragon Slayer.

sibuyanensis x ventricosa

Cultivars: Diana, Jolly Victory, Jungle Bells.

singalana x ventricosa

Cultivars: Bill Bailey.

spathulata x spectabilis

Hybrids: spectulata.
Cultivars: Helen.

spathulata x spectabilis x talangensis x ventricosa

Cultivars: Aster.

spathulata x spectabilis x truncata

Cultivars: St. Romanus.

spathulata x spectabilis x veitchii

Cultivars: Barbarian, First Light.

spathulata x talangensis x tobaica

Cultivars: Pahoehoe, Viscarla.

spathulata x tentaculata

Cultivars: C. A. Rotwang.

spathulata x truncata x ventricosa

Cultivars: Kau.

spathulata x veitchii

Cultivars: Judith Finn.

spectabilis x tobaica

Cultivars: Trubalina.

spectabilis x truncata

Cultivars: Dragon Fire, Titanic Savior.

spectabilis x veitchii

Cultivars: Vector.

stenophylla x "thorelii"

Hybrids: thofu.
Cultivars: Fulgent Koto (?).

stenophylla x truncata

Cultivars: Striking Dragon.

stenophylla x ventricosa

Cultivars: Bario (?).

talangensis x tobaica

Cultivars: Pisacho.

talangensis x truncata

Cultivars: Titanic Triumph.

talangensis x ventricosa

Cultivars: Sam, Virtue's Triumph.

"thorelii" x tobaica

Cultivars: Takayuki Sakai.

"thorelii" x truncata

Hybrids: toyoshimae.
Cultivars: Red Dragon.

"thorelii" x veitchii

Cultivars: Dreamy Koto, Dreamy Yamamoto, Igneous Koto, Sakura, Yatomi.

"thorelii" x ventricosa

Hybrids: margaretea.
Cultivars: Attractive Fuso, Attractive Koto, Maggie Jones.

"thorelii" x villosa

Cultivars: Gerontic Koto.

tobaica x truncata

Cultivars: St. Phocas.

truncata x veitchii

Cultivars: Exotic Dragon.


truncata x veitchii x ventricosa

Cultivars: Mauna Loa.

truncata x ventricosa

Hybrids: truncosa.
Cultivars: Kilauea, Otokuni, Titanic Victory.

truncata x vogelii

Cultivars: Titan's Vision.

Notes

In general: if you are here to know the parents of your hybrid, this list is a mere starting point. After this list, check other sources to see if the data match, because the Nepenthes hybrid topic can be a real mess. Examples:
- Bruce Bednar pointed out how, in the Victorian era, N. mirabilis, N. gracilis, N. hirsuta, N. khasiana and N. distillatoria were confused with each others.
- When a hybrid with dubious parentage gets used to create other hybrids, the problem drags on for decades without anybody knowing or, if the problem is known, it gives rise to parallel hypotheses that get more and more complicated in proportion to how often the hybrid was used, like with time travel.
- With man-made hybrids, you can't go in the wild and check, you can't extract the DNA and check. You have to swim among memories, impressions and opinions.
- Don't even get me started on N. alata and N. thorelii.
That being said, the more recent, simple and from a "taxonomically responsible" breeder the hybrid is, the more we can be sure about the parentage. Good luck.

Numbers: after including the entries of the Carnivorous Plant Database alone, I made some stats. There are 186 hybrids, which have been given 455 different names. Of these 455 names, 234 are latin names and 221 are cultivar names. There are 37 latin names that can boast to be the first validly published for the hybrid. Of these 37 names, 22 belong to simple hybrids (two parents) and 15 belong to complex hybrids (more than two parents). Again, even with those 15 names, in many cases the parentage is dubious.

Complex hybrids with valid names: more information about said 15 names.

Marcel Lecoufle: more about his hybrids here.

Victorian hybrids: an article by Bruce Bednar.

An abridged history of Nepenthes: an article by Harry James Veitch.

N. x hybrida and N. x sedenii: an article by Bruce Bednar.

N. x curtisii and N. x wittei: an article by Bruce Bednar. Also, here is the description of N. x wittei and here, in German, is the description of its alias N. curtisii hybrida: one, two, three.