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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.
P- ‘Princess Alice Maud’
- ‘Princess Clothilde’
- ‘Princess Grace’
- ‘Princess Leopoldine’
- ‘Princess Louise’
- ‘Princess Marie Galitzin’
- ‘Princess Mary’
- ‘Princess of Hesse’
- ‘Princess Sophia Mathilda’
- ‘Princesse Olga’
- ‘Princesse Sophie D’Orange’
- ‘Priory King’
- ‘Prise de Tombouctou’
- ‘Prizefighter’
- ‘Prokop Daubeck’
- ‘Prometheus’
- ‘Pronkstuk’
- ‘Proserpine’
- ‘Pulita’
- ‘Purple Bedder’
- ‘Purple Delight’
- ‘Purple Nosegay’
- ‘Purple Richard’
- ‘Purple Rosa’
- ‘Purple Standard’
- ‘Purpurea Perfecta’
- ‘Purpureum Grandiflora’
- ‘Pyd Stanislas’
Q- ‘Queen Dowager’
- ‘Queen of Beauties’
- ‘Queen of Bourbons’
- ‘Queen of Gipsies’
- ‘Queen of Sheba’
- ‘Queen of the Fairies’
- ‘Queen of the witches’
- ‘Queen of Tyre’
- ‘Queen Phillipa Queen’s Favourite’
- ‘Queen Sirikit’
- ‘Queen Superb’
- ‘Quicksilver’
R- ‘Racomia’
- ‘Radiatum Carmineum’
- ‘Ragged Robin’
- ‘Raggedy Anne’
- ‘Rain and Fire’
- ‘Ramonda’
- ‘Ramosum’
- ‘Raspberry’
- ‘Ray Leslie’
- ‘Razzamatazz’