Myrtaceae Juss.
Gen.Pl. [Jussieu] 322 (1789)
Eucalyptus L'Hér.
Sert.Angl. (1789)
Eucalyptus olivina Brooker & Hopper
Olive-leaved Mallee
Nuytsia 9:45-47 (1993)
Eucalyptus olivina - perangusta
Eucalyptus ollaris D.J.Carr & S.G.M.Carr
Eucalyptus 1, 76-78 (1985)
Eucalyptus omissa D.Nicolle & M.E.French
Narrow-leaved Red Mallee
Swainsona 35:108-110, Fig. 25 (2021)
Eucalyptus opaca D.J.Carr & S.G.M.Carr
Eucalyptus 1, 63-66 (1985)
Eucalyptus opimiflora D.Nicolle & M.E.French
Northern Silver Mallee
Nuytsia 22:424-426 (2012)
Eucalyptus optima L.A.S.Johnson & K.D.Hill
Telopea 8:203,Fig.16 (1999)
Eucalyptus optima subsp. hypolaena L.A.S.Johnson & K.D.Hill ms
Eucalyptus optima L.A.S.Johnson & K.D.Hill subsp. optima ms
Eucalyptus oraria L.A.S.Johnson
Ooragmandee
Contr.New South Wales Natl.Herb. 3:103-104 (1962)
Eucalyptus orbifolia F.Muell.
Round-leaved Mallee
Fragm. (Mueller) 5:50 (1865)
Eucalyptus ordiana Dunlop & Done
Nuytsia 8:197-198,Fig.1 (1992)
Eucalyptus ornata Crisp
Ornamental Silver Mallet
Nuytsia 5:311-315 (1985)
Eucalyptus orthostemon D.Nicolle & Brooker
Diverse Mallee
Nuytsia 15:409-412 (2005)
Eucalyptus orthostemon - suggrandis subsp. promiscua
Eucalyptus orthostemon × wandoo subsp. wandoo
Eucalyptus ovularis Maiden & Blakely
Small-fruited Mallee
J.Proc.Roy.Soc.New S.Wales 59:194-196 (1925)
Eucalyptus oxymitra Blakely
Sharp-capped Mallee
Trans.& Proc.Roy.Soc.South Australia 60:155 (1936)
Eucalyptus pachycarpa K.D.Hill & L.A.S.Johnson ms
Eucalyptus pachyloma Benth.
Kalgan Plains Mallee
Fl.Austral. 3:237 (1867)