| Noms géographiques | Noms scientifiques botaniques | Noms bibliques | Sobriquets | Noms d' établissements |
| Noms historiques | Noms scientifiques zoologiques | Noms fictifs | Pseudonymes |
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| Nom scientifique | Nom malgache |
| Oberonia disticha | fontsilahinjanahary |
| Obetia madagascariensis | imiha, miha |
| Obetia radula | amiambavy, amiana, amiandahy, amiandely, besofina, hafotramiana, hazomihaina, kiamiana, kolohoto, lain' amiana, mangilio, mianao, mihabe |
| Ochlandra capitata | volo, volozatsy |
| Ochnella madagascariensis | hazomena, rangahy, ranka |
| Ochrocarpos bongo | bongo, bongofotsy, mongo |
| Ochrocarpos decipiens | tsimatimanota, voandry, voatsivozy |
| Ochrocarpos madagascariensis | kijy |
| Ochrocarpos multifidus | vongo |
| Ochrocarpos orthocladus | andriapitoloha, bongo, bongolahy, bongonala, bongorano, laka, lakafotsy, mongo, rabongodahy, ro |
| Ochrocarpos perrieri | bongo, mongo |
| Ocimum basilicum | kiranjaivazaha, romba |
| Ocimum canum | karanzane, kirangay, kiranjay, kirijana, mampivehana, romba, rombakely, rombiromby, rombovola |
| Ocimum gratissimum | romba, rombare, romby |
| Ocimum suave | romba |
| Ocimum tenellum | kalombanda |
| Ocotea alveolata | varongilahy, varongimainty, varongimena |
| Ocotea auriculiformis | varongimainty, varongimavo, varongy |
| Ocotea capuronii | tafonona |
| Ocotea caudatifolia | tafonona |
| Ocotea corethroides | varongifotsy |
| Ocotea cymosa | antafonana, antafonona, tafono, tafononampotsy, tapaka, tefomoha, varongiberavina, varongifotsy, varongimainty, varongimavo, varongitainjaza |
| Ocotea discoidea | varongimena |
| Ocotea domatifera | tafonona |
| Ocotea eriothyrsa | varongimainty |
| Ocotea faucherei | varongifotsy, varongimavo, varongy |
| Ocotea foveolata | varongimainty |
| Ocotea humblotii | antafonona, tafona, tafonona, tafononafotsy, tafononamavo, tafonono, varongy |
| Ocotea involuta | varongimainty |
| Ocotea laevis | antafonona, hazombarorana, tafomorona, tafononafotsy, tafonono, tafononofotsy, tapaka, tavolopika, varongifotsy, varongimadinidravina, varongimavo, varongimavokely, varongy |
| Ocotea longipes | tafono, tafonono |
| Ocotea macrocarpa | tafononana, varongifotsilavaravina, varongimainty, varongimanitra |
| Ocotea macrorhiza | tafonona |
| Ocotea madagascariensis | ambavala, tafonoana, tafonono, varongimavo, voantsila |
| Ocotea nervosa | varongiberavina, varongimainty, varongy |
| Ocotea perforata | varongy |
| Ocotea platydisca | tafinoamainty, tafononamainty, varongikely, varongilahy, varongimainty, varongy |
| Ocotea racemosa | farongimainty, tafanono, tafona, tafono, tafonona, tafononana, varongimainty, varongimavo, varongimena, varongy |
| Ocotea rigidifolia | tafonona, varongifotsy |
| Ocotea sessiliflora | varongifotsy |
| Ocotea similis | varongifotsy |
| Ocotea sp. | tafahona |
| Ocotea thouvenotii | antafonana, tafonona, tafonono, varongiberavina, varongiravimanga, varongivavy, varongy |
| Ocotea trichantha | hazonjaza, maroanaka, varongy |
| Ocotea trichophlebia | antafonana, tefonoa, varongifotsy, varongimainty, varongimavo, varongiravimbanana, varongitefonoa, vasefaka |
| Ocotea | laza |
| Olax andronensis | hazomparasy, hazompasy, hazonjanahary |
| Olax emirnensis | maitsoririnina, marankoditra |
| Olax glabriflora | maitsorina, maitsoririnina |
| Olax humbertii | remaitso |
| Olax lanceolata | ambihotse |
| Olax sp. | bareraka |
| Oldenlandia caffra | kimalomata, matoakely, rongonintany, tsipipika, voandrongonitany |
| Oldenlandia corymbosa | ahibitsika |
| Oldenlandia heynei | kiamalomanta |
| Oldenlandia heynii | ahibahiny, ahibitsika, arindranto, fozankoa, isipopoka, raiditra, taborimbahiny, tamborombahiny |
| Oldenlandia lancifolia | ahibitsika, fandorovahiny, kiamalomanta, tamborombahiny |
| Oldenlandia paniculata | anamofetra |
| Oldenlandia trinervia | fozako, fozankao |
| Olea sp. | karakakiñy |
| Oliganthes lecomtei | tambakombako |
| Oliganthes pseudocentauropsis | hazomboay |
| Olyra latifolia | maheritola, tsigegolovolo, valoriotrabe, voavalotra, voloko, volopoko, voloriotrabe |
| Omphalea palmata | sarihasy |
| Oncinotis nigra | vahimainty, vahimpingotra |
| Oncinotis tomentella | tandrokosy |
| Oncoba capreifolia | lafara, sakafare, voandafara |
| Oncostemum balanocarpum | hasoto |
| Oncostemum botryoides | fanonobe, harizo, satoky |
| Oncostemum capitatum | tsitohitohy |
| Oncostemum fusco-pilosum | hazontoho |
| Oncostemum fuscopilosum | sarihangy |
| Oncostemum humbertianum | satoky |
| Oncostemum leprosum | hazontoho, hazotoa |
| Oncostemum lucens | hazontoho |
| Oncostemum macrophyllum | hazontohovavy, ranitsoa, tsimangotra |
| Oncostemum meeusianum | hazontoho |
| Oncostemum neriifolium | hazontoho |
| Oncostemum sp. | ampalafa, hazoto, manarapoana, tanterakalavavy |
| Operculicarya decaryi | japy |
| Operculicarya gummifera var. | jabihy, zabiky |
| Operculicarya gummifera | sakoabanditse, zabiky, zaby |
| Operculicarya hyphaenoides | sondririna, zabe, zaby |
| Operculicarya monstruosa | talaby |
| Ophiocolea delphinensis | voalava |
| Ophiocolea floribunda | antsasakangatra, felantsohy, rehareha, reharehalahy, reirey, riaria, sefantsohy, tsetsefinantsoy, tsetsempimpy, velomiriaria, voalava, voalavariana, voandriaria |
| Ophioglossum nudicaule | sofintokana |
| Opuntia vulgaris | aketa, lain-draketa, raiketa, raketa, tsilo, voantsilo, voantsiloraiketra |
| Oreosyce africana | vahetiaombe |
| Oryza longistaminata | behatoka, jama, varijao, varinandrianahary |
| Oryza sativa | akotrim-bary, akotry, angeka, boritika, botri-vaventy, fampitanana, kalila, karaokana, kelimidina, ketsa, kiriminy, kiritika, kofobare, lambam-bary, lantsidahy, loahambitro, maintisomotra, mazy, rojo, tsipala, vary |
| Osmunda regalis | ampangafenakoho, ampangandrano |
| Otiophora scabra | ngitakely |
| Ottelia ulvifolia | ivirandrana, lopatra, ovirandrana, tantangindrano |
| Oxalis apodiscias | sinedrisinedry |
| Oxalis caprina | kisiranondrilahy |
| Oxalis corniculata | kidiadiamborona, kimamy, kodiadiavorona |
| Oxalis livida | kisiranaondre, kodiadiamboronankaratra, kodiadiavoronankaratra |
| Oxalis repens | kidiadiamborona |
| Oxalis sensitiva | hazoandro, kelimangalanitra, kelimanganelitra, kelimanjakalanitra, manendrilanitra |
| Oxalis simulans | kisira |
| Oxalis villosa | kabona |
| Oxyrhachis gracillima | ahitsorohitra |
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