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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- ‘Pere Secchi’
- ‘Permanent Wave’
- ‘Perpetual’
- ‘Perpetual Scarlet’
- ‘Persian’
- ‘Petersham Pet’
- ‘Pheasant’s Eye’
- ‘Philip Crawley’
- ‘Phillippe le Bel’
- ‘Phonography’
- ‘Phylades’
- ‘Pillar of Gold’
- ‘Pink Baby Jarrett’
- ‘Pink Bedder’
- ‘Pink Better Times’
- ‘Pink Champion’
- ‘Pink Ears’
- ‘Pink Frock’
- ‘Pink Galactic’
- ‘Pink Globe’
- ‘Pink Reg Bleckley’
- ‘Pink Rosette’
- ‘Pink Splendour’
- ‘Pink White Cloud’
- ‘Pinwheel SalmonHarris seeds.’
- ‘Pitch’
- ‘Pixey Queen’
- ‘Pixie Wright’
- ‘Pixiette’
- ‘Point Loma’
- ‘Pokal’
- ‘Poker’
- ‘Polychrome’
- ‘Polyverde’
- ‘Pomona’
- ‘Porcelain Rose’
- ‘Postman’s Coat’
- ‘Praelstik’
- ‘President Aug. van Geert’
- ‘Preston Aztec’
- ‘Pride of Mount Hope’
- ‘Pride of Rossway’
- ‘Pride of Surrey’
- ‘Prima Dona’
- ‘Primrose’
- ‘Prince Alfred’
- ‘Prince Eugene’
- ‘Prince Henry of Battenburg’
- ‘Prince of Prussia’
- ‘Prince of Waterloo’