Unsupported cultivar names

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In the following list, cultivar names have been recorded without attribution or description and additional information is unavailable at the time of going to print.

History or knowledge of these cultivars should be sent to the Registrar for inclusion in the Addendum.

    O
  • ‘O.B.Q.I’
  • ‘Ocean Wave’
  • ‘Ocellatum’
  • ‘Ockley Star’
  • ‘Octave Opoix’
  • ‘Oddfellow’
  • ‘Oddity’
  • ‘Odette’
  • ‘Odiers’
  • ‘Odorate Magniflora’
  • ‘Oethe’
  • ‘Offenbach’
  • ‘Ogleveeā€™s Veronica’
  • ‘Old Rose Spice’
  • ‘Old-Fashioned Light Purple’
  • ‘Olive Baden-Powell’
  • ‘Oliver Twist’
  • ‘Olympicum Superbum’
  • o
  • ‘om Thumbs Bride’
  • O
  • ‘Omen’
  • ‘One Grand’
  • ‘Opale’
  • ‘Ophelia’
  • ‘Oppolion’
  • ‘Optimum’
  • ‘Orange Boven’
  • ‘Orange Crampel’
  • ‘Orange et Jaune’
  • ‘Orange Globe’
  • ‘Orange Masterpiece’
  • ‘Orange Queen Ivy Leaf.’
  • ‘Orange Salmon Sport’
  • ‘Orange Splash’
  • ‘Orchid Glory’
  • ‘Oreon’
  • ‘Oriole’
  • ‘Orthello’
  • ‘Oscar Stanley’
  • ‘Our Splendour’
  • ‘Oxford’