| 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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