'Obelix' NCC
'Oberon' NCC
'Objev' NCC
'Obristii' x salmonica
'Ochroleuca' x elisabethae
'Odd' NCC
'Odin' NCY
'Odysseus' clone sancta
'Old Britain' x boydii
'Oliver Hardy' NCY
'Olympus' x boydilacina
'Omar Khayyam' NCY
'Omega' NCY
'Ontarion' NCY
'Opalescent' NCC
'Opotov' x megaseaeflora
'Ophelia' x arco-valleyi
'Oradour' x lincolni-fosteri
'Orava' NCC
'Oriole' x boydii
'Orion' x kepleri
'Osirus' NCC
'Ottawa' NCC
'Ottone Rosai'
'Oxhill' NCY