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| R. bureavioidesSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. callimorphum var callimorphumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. callimorphum var callimorphum 'Second Attempt'Rhododendron Species SelectionSelected By: Crown Estate Commissioners , Windsor, Berkshire , England, 1980 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. callimorphum var myiagrumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. calophytum ssp jinfuenseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. calophytum var calophytumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. calophytum var calophytum 'Cindy Louise'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. calophytum var openshawianumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp aeruginosumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp aeruginosum 'Blauschimmer'Rhododendron Species SelectionSelected By: Hachmann, Hans , Barmstedt in Holstein , Germany, 1992 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp campanulatumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp campanulatum 'Knaphill'Rhododendron Species SelectionSelected By: Rothschild, L. de , Founder of Exbury Gardens , UK, 1925 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp campanulatum 'Roland Cooper'Rhododendron Species SelectionSelected By: unknown, 1964 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campanulatum ssp campanulatum 'Waxen Bell'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campylocarpum Elatum GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campylocarpum ssp caloxanthumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campylocarpum ssp campylocarpumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campylocarpum ssp campylocarpum 'Elsie Straver'Rhododendron Species SelectionSelected By: Straver, 1969 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. campylocarpum ssp campylocarpum 'Magor'Rhododendron Species SelectionSelected By: Hachmann, Hans , Barmstedt in Holstein , Germany, 1983 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catacosmumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbienseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Album Formosum'Rhododendron Species SelectionSelected By: Veitch & Son, J. , Royal Exotic Nurseries, Chelsea, London , England, 1867 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Anica Bricogne'Rhododendron Species SelectionSelected By: Leroy, L., 1868 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Babîtes Ginta'Rhododendron Species SelectionSelected By: Kondratovičs, Rihard , Riga , Latvia, 1965 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Catalgla'Rhododendron Species SelectionSelected By: Gable, J.B. , Stewartstown, Pennsylvania , USA, 1958 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Catawbiense Grandiflorum'Rhododendron Species SelectionSelected By: Waterer, A. , Woking, Surrey , UK, 1850 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Cheryl'Rhododendron Species SelectionSelected By: Philips, Kevin 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Clark's White'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Flore Pleno'Rhododendron Species SelectionSelected By: Whitley & Osborn, 1850 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Irina'Rhododendron Species SelectionSelected By: Kondratovičs, Rihard , Riga , Latvia, 1965 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Ken's Find'Rhododendron Species SelectionSelected By: Moore, K., 1983 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'La Bar's Red'Rhododendron Species SelectionSelected By: La Bar's Nursery, 1972 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'La Bar's White'Rhododendron Species SelectionSelected By: La Bar's Nursery, 1959 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. catawbiense 'Lavanda'Rhododendron Species SelectionSelected By: Kondratovičs, Rihard , Riga , Latvia, 1965 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Powell Glass'Rhododendron Species SelectionSelected By: Glass, Mrs P. , USA, 1959 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Purpureum Elegans'Rhododendron Species SelectionSelected By: Waterer, H. (Knaphill) , Woking, Surrey (Knaphill) , UK, 1850 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. catawbiense 'Red Cat'Rhododendron Species SelectionSelected By: Gable, J.B. , Stewartstown, Pennsylvania , USA, 1958 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Roan Mountain'Rhododendron Species SelectionSelected By: unknown, 1982 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Tancrčde'Rhododendron Species SelectionSelected By: Leroy, L., 1868 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. catawbiense 'Uldis'Rhododendron Species SelectionSelected By: Kondratovičs, Rihard , Riga , Latvia, 1957 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. caucasicumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. caucasicum 'Album Egregium'Rhododendron Species SelectionSelected By: Laurentius, H., 1869 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. caucasicum 'White's Cunningham's Sulphur'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. cerasinumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. cerasinum 'Beer Sheba'Rhododendron Species SelectionSelected By: Rothschild, L. de , Founder of Exbury Gardens , UK, 1948 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. cerasinum 'Cherry Brandy'Rhododendron Species SelectionSelected By: Kingdon Ward 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. cerasinum 'Coals of Fire'Rhododendron Species SelectionSelected By: Kingdon Ward 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. cerasinum 'Herbert Mitchell'Rhododendron Species SelectionSelected By: Anne, Countess of Rosse and NT (Nymans), 1973 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. chamaethomsonii var chamaedoronSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. chamaethomsonii var chamaethaumaSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. chamaethomsonii var chamaethomsoniiSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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