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Referred to in the Register and Checklist
R- ‘Rager C.W. USA.’
- ‘Rawlings S. UK. (Lackhams College Wilts)’
- ‘Read F.G. UK.’
- ‘Rendatler Fr.’
- ‘Rendle UK.’
- ‘Richalet Fr. (Spalding)’
- ‘Richards Mrs. J. Aust.’
- ‘Richardson Mrs. P. UK.’
- ‘Richie Mrs. D.J. Aust.’
- ‘Robbins UK.’
- ‘Rober, Ernest Heinrick Christian USA. (Geranium Farm, West Los Angeles Nursery)’
- ‘Roberts D. UK.’
- ‘Robinson A.S. UK.’
- ‘Robinson Mr. Aust.’
- ‘Rock (Spalding)’
- ‘Rogers UK.’
- ‘Roller, Carole USA.’
- ‘Rollinson UK.’
- ‘Ross, Ervin & Mary Ellen USA. (Merry Gardens)’
- ‘Roth USA.’
- ‘Rouge’
- ‘Rouse Belg.’
- ‘Roxain Fr. (Spalding)’
- ‘Rozain Fr. (Spalding)’
- ‘Rozain-Boucharlet Fr. (Spalding)’
- ‘Rudolph van der Goot’
- ‘Rundle’
- ‘Russell UK.’
- ‘Rutter W.E. UK.’