These lists include 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 = 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 opimiflora D. Nicolle
& M.E. French
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 ornans Rule & Molyneux = E. elata
Eucalyptus ornata Benth. pro. syn.
[nom. illeg.] = ? E. pilularis
Eucalyptus ornata Crisp
Eucalyptus orophila L.D.Pryor extra-Australian species from Timor-Leste
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 = reputed hybrid E. globulus subsp. pseudoglobulus × E. tereticornis
Eucalyptus ovularis Maiden &
Blakely
Eucalyptus oxymitra Blakely
Eucalyptus oxypoma Blakely = reputed hybrid E. camaldulensis × E. largiflorens