| 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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