| 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 |
| Pandanus obeliscus | fasy, hofa, vakoa |
| Foetidia obliqua | hazontazanana, siho |
| Landolphia obliquinervia | voahena |
| Cydonia oblonga | kaontsy, kontsy, voamerika |
| Ravensara oblonga | tavolohazo |
| Blotia oblongifolia | faniavala, fanjavala, fotsinanahary, hazompantsika, hazompasika, kotrofotsy, maroandrano, tanatanampotsy |
| Dichaetanthera oblongifolia var. | kotrokotroka |
| Dichaetanthera oblongifolia var. | tsitrotroka |
| Dichaetanthera oblongifolia | felabarika, kotrokotroka, voatrotroka |
| Dombeya oblongifolia | hafobalo, hafotramena |
| Macaranga oblongifolia | mokaranandahy |
| Protorhus oblongifolia | hazombarorana, manavodrevo, tarata |
| Saldinia oblongifolia | voakiringy, voanananala |
| Pittosporum oblongifolium | hazombarorana |
| Cabucala oblongo-ovata | hentona |
| Beilschmiedia obovata | tavoloravintsara |
| Crateva obovata | tangena, vodiaomby, vodiomby |
| Embelia obovata | tanterakala |
| Flueggea obovata | hena |
| Gaertnera obovata | tsitirontafika |
| Macaranga obovata | makaranga, makarangiana, mokarana, mokaranana |
| Pachytrophe obovata var. | tsipatika |
| Pachytrophe obovata | hazomanoro, maherikely, tsipatika, tsipaty, varongimalailay |
| Petalodactylis obovata | voavandrikala |
| Potameia obovata | mataviavaratravavy |
| Secamone obovata | vahinza |
| Tambourissa obovata | amboralahy |
| Saldinia obovatifolia | fanavifotsy, lengotrazo |
| Poivrea obscura | mandriambobolahifito, salaibe, tamenaka |
| Combretum obscurum | salaibe |
| Rauvolfia obtusiflora | hamotandrano, kaboka, kabokala, tambahay, tangenala |
| Cyperus obtusiflorus | fitsiakolatsa, vendrangasy |
| Canavalia obtusifolia | lalandana, ravindalandalana, voandalandana |
| Colea obtusifolia | akondrokondroala, antsatokangatsy, sofintsohy, sokondrokondroala, tsetsefinantsoy |
| Euodia obtusifolia | bilahy |
| Harveya obtusifolia | parakinamboa, sarinatsipenala |
| Huperzia obtusifolia var. | tsilakivavy, tsilaky |
| Huperzia obtusifolia | simaorona |
| Linociera obtusifolia | masonambatsy |
| Psychotria obtusifolia | kirandrambahivary, kirandrambehivavy |
| Campylospermum obtusifolium | ampaly, malambovavy, menahy |
| Anacardium occidentale | abiba, abibo, habiba, koroso, mabiba, mahabiba, mahabibo, tabiba, voambarika |
| Canthium occidentale | fatikahitra |
| Bosqueia occidentalis | kilily |
| Cassia occidentalis | ambirondolo, bemaimbo, intsakitsana, kintsakintsana, maimbobe, manakontsovoka, saringoazy, tsatsinangatra, tsirokinangatra, tsirorokanangatra, tsorokanangatra, tsororangatra, tsotsorinangatra, vantsiraokonangatra, voanembanalika, voanembanamboa, voanjary, voantsiraokonangatra, voantsirokinimaro, voantsiroko, voantsorokanangatra, voatsokonangatra, vonjara |
| Maillardia occidentalis | andrarano, bijofy |
| Mimusops occidentalis | nanto, nato |
| Vernonia ochroleuca | atindrambo |
| Pittosporum ochrosiifolium var. | azombary |
| Pittosporum ochrosiifolium | amborantsaha, amborasaha, ambovitsika, ampale, ampaly, fantsikala, faraimpa, fatsikala, hambovitsika, hazombary, hazombavy, hazombony, longotra, maimboloha, masakatsara, tsimasakatsara |
| Cryptocarya ocoteifolia | varongifotsy, varongimainty, varongy |
| Ludwigia octovalvis subsp. | lelavoana, molaliambo |
| Ludwigia octovalvis | voahangindrano |
| Dicliptera ocymoides | felikadabo |
| Spermacoce ocymoides | ambotonona |
| Cananga odorata | ilañilañy |
| Pandanus odoratissimus | hofa |
| Nasturtium officinale | anandrano |
| Saccharum officinale | fary |
| Zingiber officinale | sakamalao, sakamalaokely, sakarivo |
| Althea officinalis | fiandrilavenombazaha |
| Cinchona officinalis | kinkina |
| Saccharum officinarum | andrefo, farimainty, farimanga, fary, fia-pary, fisika, lailay, lengompary, mavotohona, ongompare |
| Adenia olaboensis | holaboay, holamboay, holitramboay, olaboay |
| Secamone oleaefolia | famonodindo, vahimpapango |
| Memecylon oleaefolium | fandirandahy |
| Moringa oleifera | anambo, anamorongo, ananaboringa, ananambo, felikambo, felikamoranga, felinimorongovazaha, landihazo, moringa, morongo, morongy, soahazo |
| Carissa oleoides | kironono |
| Brassica oleracea subsp. | laisoa |
| Brassica oleracea subvar. | laisoaflera |
| Brassica oleracea var. | sofilera |
| Brassica oleracea var. | laisoa |
| Brassica oleracea | laisoa |
| Portulaca oleracea | anamatavy, ananjabora, fandrianomby, kalabotretra, kalabotretraka, kambo, taikombelahy, tsikobokobondanitra |
| Spilanthes oleracea | laho |
| Spinacia oleracea | anamamimbazaha |
| Sonchus oleraceus | anamboraka, beroberobazaha, beroberoka, beroberokamboa, beroberokondrilahy, majajay |
| Eugenia oligantha | rotra |
| Symphonia oligantha | vavony |
| Elaeodendron oliganthum | fanazava |
| Pandanus oligocephalus | vakoandambo |
| Urera oligoloba | amiana, amiandambo, hafotramiana, lelavarika |
| Hypoxis oligophylla | kitsonjomparakandro |
| Polyalthia oligosperma | ambavy, hazomby, rombavy |
| Eugenia ombrophila | rotra |
| Euphorbia oncoclada | betondro, famata, famatabetondro |
| Cyperus onivensis | vendranala |
| Eugenia onivensis | rotra |
| Beilschmiedia oppositifolia | oviary, voakoromanga |
| Mollugo oppositifolia | anamafaika, anamangidy, fangitsy, felimafaitra |
| Nuxia oppositifolia | lambinana, valanira |
| Stadmannia oppositifolia var. | zaha |
| Stadmannia oppositifolia | hazomafinto, zaha |
| Homalium oppositifolium | kasaka, sana |
| Micranthus oppositifolius var. | vatofolamainty |
| Micranthus oppositifolius | sarikimalao, vatofolamainty |
| Melhania orbiculari-dentata | befela |
| Commiphora orbicularis | daro, sekatse, sengatsy |
| Croton oreades | molanga |
| Bixa orellana | sahy, vahinamalona |
| Perrierastrum oreophilum | andriamborondreo, hazomborondreo |
| Kalanchoe orgyalis | hazombato, hazombatomadinika, kilengavazanosy, toarenihazo |
| Clematis orientalis subsp. | vaheavoraka |
| Clematis orientalis subsp. | fotsivolomanoa |
| Clematis orientalis | vahimbarimaty, vahimbary, vahivoraka |
| Hyacinthus orientalis | jasinta |
| Pentachlaena orientalis | ampody, tentindambo, volontsora |
| Perriera orientalis | aombilahiala, ombilahiala |
| Rourea orientalis | fitsongo, kitrongo, kitsongo, kitsongolahy, kotsongo, sifaka, voampika |
| Scolopia orientalis | aferonakavy, lampivahatra, menahimadinidravina, menahy, tokokintsy |
| Sigesbeckia orientalis | ditinangatra, mandalodiaraikitra, satrikoazamaratra, satrikoefamaratra, tsivadihana |
| Trema orientalis | andraraizina, andrareza, andrarezina, angesoba, angezoka, hazongazona, ilaibaratra, selivaratsy, tsivakimbaratra, vakoka |
| Polyscias ornifolia | voantsila, voantsilana |
| Euphorbia orthoclada | tranonkary |
| Ochrocarpos orthocladus | andriapitoloha, bongo, bongolahy, bongonala, bongorano, laka, lakafotsy, mongo, rabongodahy, ro |
| Cassia orthoxantha | moranga |
| Vitex oscitans | fandrianagoaika |
| Rhinacanthus osmospermus | ravinalakely, voanalakely |
| Jussiaea ovalifolia | mandaly |
| Ravensara ovalifolia | molaliambo, tavoloazo, tavolohazo, tavolopina |
| Catharanthus ovalis | ilamena, kilaimena, kita, kitia, kitra, tsipelana |
| Anisomeles ovata | lanjananahary |
| Ptelidium ovatum | lamokana |
| Dioscorea ovinala | angaroka, angaroky, oviala, ovinala, sosa, soso, viala |
| Calopyxis oxygonia | menakabongo, voantamenaka |
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