Octopetala		aurigeranum x (Dr. Hermann Sleumer x leucogigas)
Ok Tedi Gold	R	Tropic Glow x laetum
Ophelia	R	javanicum x Princess Alexandra
Orange Cascade		christianae x unknown
Orange Flambe
Orange Glow		macgregoriae x stenophyllum
Orange Harmony	R	Sweet Wendy x javanicum
Orangemaid	R	laetum x macgregoriae
Orange Queen		Salmon Sensation x javanicum
Orangerie Bay		viriosum x culminicolum
Orange Smoothie		(intranervatum x Pink Delight) x javanicum
Orange Wax	R	unknown
Oriana		macgregoriae x laetum
Oriental Orange	R	aurigeranum x unknown
Our Marcia	R	(Dr. Hermann Sleumer x herzogii) x (laetum x aurigeranum)
Our Margaret	R	(christianae x viriosum) x zoelleri
Our Mary	R	zoelleri x Dr. Hermann Sleumer
Our Pindi Pearl
Our Waltzing Matilda	R	Arthur's Choice x Gardenia Odyssey
Overflow	R	(christianae x viriosum) x (christianae x viriosum)