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Referred to in the Register and Checklist
P- ‘PaineW.H. Aust. (Mount Iris Nurseries)’
- ‘Palmer, Alan UK.’
- ‘Pamplin UK.’
- ‘Paquot Fr.’
- ‘Parfitt R.W. UK. (Springfield Nurseries)’
- ‘Parker (Spalding)’
- ‘Parker USA.’
- ‘Parmenter Mrs. A. UK.’
- ‘Parmenter UK.’
- ‘Parrett H.F. UK. (The Nurseries)’
- ‘Parsons, Ian UK.’
- ‘Pat Can.’
- ‘Paterson, Peter Aust.’
- ‘Patneham Aust.’
- ‘Patterson S. Aust.’
- ‘Paul F. UK.’
- ‘Paul W. UK.’
- ‘Payne UK.’
- ‘Payneham (Swell, Henry >1930, Bowel’s J.W. ) Aust.’
- ‘Peakhurst Aust.’
- ‘Pearce A.E. of Farnham UK.’
- ‘Pearson (Spalding)’
- ‘Pearson J.R. UK. (Chilwell Nurseries)’
- ‘Peat, Sam. UK.’
- ‘Pejcha, Josef Cz.’
- ‘Pelatscheck Bros.’
- ‘Perkins Aust.’
- ‘Perkins UK.’
- ‘Pertuzes Belg.’
- ‘Peterson NZ.’
- ‘Petron Aust.’
- ‘Pettigrew UK.’
- ‘Pfitzer W.G. Ger.’
- ‘Phillips T.H. & A.E. UK. (Henstridge Nurseries)’
- ‘Pierrt, Mrs. Pat. Can.’
- ‘Pitkins USA.’
- ‘Plaisancon’
- ‘Plaisancon Fr.’
- ‘Poirier Fr.’
- ‘Polatschek, Josef Aus.’
- ‘Pollard, Steve. UK.’
- ‘Pope M. UK.’
- ‘Popham UK.’
- ‘Popperwell, Mrs. E.A. UK.’
- ‘Portas, Tom and John UK.’
- ‘Poss, Martin A. USA.’
- ‘Post, Phillip M. USA.’
- ‘Postan UK.’
- ‘Potten-Losten (Spalding)’
- ‘Pottinger, Bill. UK.’