This list includes all eucalypt names, those taxa accepted in EUCLID and previously published names.

Eucalyptus obconica Brooker & Kleinig
Eucalyptus obcordata Turcz. = E. platypus subsp. platypus
Eucalyptus obesa Brooker & Hopper
Eucalyptus obliqua L'Her.
Eucalyptus obliqua var. alpina Maiden = E. delegatensis subsp. delegatensis
Eucalyptus obliqua var. degressa Blakely = E. obliqua
Eucalyptus obliqua var. discocarpa Blakely = reputed hybrid E. muelleriana × E. obliqua
Eucalyptus obliqua var. megacarpa Blakely = E. obliqua
Eucalyptus obliqua var. microstoma Blakely = reputed hybrid E. obliqua × ?
Eucalyptus obliqua var. pilula Blakely = reputed hybrid E. obliqua × ?
Eucalyptus oblonga DC. = E. globoidea
Eucalyptus oblonga var. rugulosa Blakely = E. globoidea
Eucalyptus obstans L.A.S.Johnson & K.D.Hill = E. burgessiana
Eucalyptus obtusiflora DC. & K.D.Hill
Eucalyptus obtusiflora subsp. cowcowensis L.A.S.Johnson & K.D.Hill = E. obtusiflora
Eucalyptus obtusiflora subsp. dongarraensis (Maiden & Blakely) L.A.S.Johnson & K.D.Hill = E. obtusiflora
Eucalyptus obtusiflora var. dendromorpha Blakely = E. dendromorpha
Eucalyptus obtusifolia G.Don = E. obtusiflora
Eucalyptus occidentalis
Endl.
Eucalyptus occidentalis var. astringens Maiden = E. astringens subsp. astringens
Eucalyptus occidentalis var. californica Kinney = identity uncertain
Eucalyptus occidentalis var. eremophila Diels = E. eremophila
Eucalyptus occidentalis var. grandiflora Maiden = E. aspratilis
Eucalyptus occidentalis var. macrandra (Benth.) Maiden = E. macrandra
Eucalyptus occidentalis var. oranensis Trab. = identity uncertain
Eucalyptus occidentalis var. spathulata (Hook.) Maiden = E. spathulata
Eucalyptus occidentalis var. stenantha Diels ex Blakely = E. aspratilis
Eucalyptus ochrophloia F.Muell.
Eucalyptus ochrophylla Maiden & Blakely = E. concinna
Eucalyptus odontocarpa F.Muell.
Eucalyptus odorata Behr
Eucalyptus odorata var. angustifolia Blakely = E. odorata
Eucalyptus odorata var. calcicultrix Miq. = E. porosa
Eucalyptus odorata var. erythrandra F.Muell. ex Miq. = E. odorata
Eucalyptus odorata var. floribunda Benth. = identity uncertain
Eucalyptus odorata var. macrocarpa Blakely Image of type specimen held at CANB= reputed hybrid E. albopurpurea
Eucalyptus odorata var. purpurascens (Benth.) Maiden = E. albopurpurea
Eucalyptus odorata var. refracta Blakely = E. odorata
Eucalyptus odorata var. woollsiana Maiden = E. pilligaensis
Eucalyptus oldfieldii F.Muell.
Eucalyptus oldfieldii var. drummondii (Benth.) Maiden = E. drummondii
Eucalyptus oleosa F.Muell. ex Miq. subsp. oleosa
Eucalyptus oleosa f. lucida C.A.Gardner [nom. illeg.] = E. kochii subsp. amaryssia
Eucalyptus oleosa subsp. ampliata L.A.S.Johnson & K.D.Hill = E. oleosa subsp. oleosa
Eucalyptus oleosa subsp. corvina L.A.S.Johnson & K.D.Hill
Eucalyptus oleosa subsp. cylindroidea L.A.S.Johnson & K.D.Hill
Eucalyptus oleosa subsp. repleta L.A.S.Johnson & K.D.Hill = E. oleosa subsp. oleosa
Eucalyptus oleosa subsp. victima L.A.S.Johnson & K.D.Hill = E. oleosa subsp. oleosa
Eucalyptus oleosa subsp. wylieana L.A.S.Johnson & K.D.Hill = E. oleosa subsp. oleosa
Eucalyptus oleosa var. angustifolia Maiden = E. oleosa subsp. oleosa
Eucalyptus oleosa var. borealis C.A.Gardner = E. kochii subsp. borealis
Eucalyptus oleosa var. flocktoniae Maiden = E. flocktoniae subsp. flocktoniae
Eucalyptus oleosa var. glauca Maiden = E. transcontinentalis
Eucalyptus oleosa var. kochii C.A.Gardner = E. kochii subsp. kochii
Eucalyptus oleosa var. longicornis F.Muell. = E. longicornis
Eucalyptus oleosa var. obtusa C.A.Gardner = E. oleosa subsp. oleosa
Eucalyptus oleosa var. peeneri Blakely = E. eremicola subsp. peeneri
Eucalyptus oleosa var. plenissima C.A.Gardner = E. kochii subsp. plenissima
Eucalyptus olida L.A.S.Johnson & K.D.Hill
Eucalyptus oligantha Schauer
Eucalyptus oligantha subsp. modica L.A.S.Johnson & K.D.Hill = E. oligantha
Eucalyptus olivacea Brooker & Hopper ms = E. macrandra
Eucalyptus olivina Brooker & Hopper
Eucalyptus ollaris D.J.Carr & S.G.M.Carr = Corymbia umbonata
Eucalyptus olsenii L.A.S.Johnson & Blaxell
Eucalyptus oocarpa D.J.Carr & S.G.M.Carr = Corymbia oocarpa
Eucalyptus opaca D.J.Carr & S.G.M.Carr = Corymbia terminalis
Eucalyptus ophitica L.A.S.Johnson & K.D.Hill
Eucalyptus oppositifolia Desf.   nom. nud. [nom. illeg.] = Corymbia gummifera
Eucalyptus optima L.A.S. Johnson & K.D. Hill
Eucalyptus oraria L.A.S.Johnson
Eucalyptus orbifolia F.Muell.
Eucalyptus ordiana Dunlop & Done
Eucalyptus oreades R.T.Baker
Eucalyptus oresbia J.T.Hunter & J.Bruhl = E. cypellocarpa
Eucalyptus orgadophila Maiden & Blakely
Eucalyptus orientalis D.J.Carr & S.G.M.Carr = Corymbia terminalis
Eucalyptus ornata Benth. pro. syn. [nom. illeg.] = ? E. pilularis
Eucalyptus ornata Crisp
Eucalyptus orophila L.D.Pryor (not in Australia) Image of type specimen held at CANB
Eucalyptus orthostemon Nicolle & Brooker
Eucalyptus ovalifolia R.T.Baker = E. polyanthemos subsp. polyanthemos
Eucalyptus ovalifolia var. lanceolata R.T.Baker & H.G.Sm. = E. polyanthemos subsp. polyanthemos
Eucalyptus ovata Labill. var. ovata
Eucalyptus ovata var. aquatica Blakely = E. camphora subsp. camphora
Eucalyptus ovata var. camphora (R.T.Baker)Maiden = E. camphora subsp. camphora
Eucalyptus ovata var. grandiflora Maiden
Eucalyptus oviformis Maiden & Blakely Image of type specimen held at CANB= reputed hybrid E. globulus subsp. pseudoglobulus × E. tereticornis
Eucalyptus ovularis Maiden & Blakely
Eucalyptus oxymitra Blakely
Eucalyptus oxypoma Blakely Image of type specimen held at CANB= reputed hybrid E. camaldulensis × E. largiflorens

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