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| R. aberconwayiSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aberconwayi 'His Lordship'Rhododendron Species SelectionSelected By: Crown Estate Commissioners , Windsor, Berkshire , England, 1945 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aberconwayi 'Westhaven'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenogynumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenogynum Adenophorum GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenogynum 'Kirsty'Rhododendron Species SelectionSelected By: Clarke, S.R. , Borde Hill, West Sussex , England, 1976 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenogynum 'Kristy'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenopodumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. adenosumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aganniphum var aganniphumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aganniphum var aganniphum Glaucoplepum GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aganniphum var flavorufumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. agastumNatural HybridR. irroratum ssp irroratum X R. arboreum ssp delavayi var delavayi
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. albertsenianumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. alutaceum var alutaceumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. alutaceum var iodesSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. alutaceum var iodes 'White Plains'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. alutaceum var russotinctumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. alutaceum var russotinctum 'Easter Island'Rhododendron Species SelectionSelected By: Clarke, S.R. , Borde Hill, West Sussex , England, 1980 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. annae ssp annaeSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. annae ssp annae 'Anna Strelow'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. annae ssp annae 'Folk's Wood'Rhododendron Species SelectionSelected By: unknown, 1977 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. annae ssp laxiflorumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. anthosphaerumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. anwheienseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. aperantumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. araiophyllumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. araiophyllum 'George Taylor'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. araiophyllum ssp lapidosumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum f albumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum Kingianum GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Alan Campbell-Johnson'Rhododendron Species SelectionSelected By: Thornton, R.E., 2003 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Blood Red'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Doctor Bowman'Rhododendron Species SelectionSelected By: Tuomala, C. , Fort Bragg, CA , USA 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Dr. Bowan'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Goat Fell'Rhododendron Species SelectionSelected By: unknown, 1964 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Henry Shilson'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Holder Hall'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. arboreum ssp arboreum 'John Skrentny'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Lambdenii'Rhododendron Species SelectionSelected By: Knight & Perry , (J. Knight & T. A. Perry), Exotic Nursery, Chelsea, London , England, 1850 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Riviera Beauty'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp arboreum 'Rubaiyat'Rhododendron Species SelectionSelected By: Rothschild, Edmund Leopold de , Southampton , UK, 1968 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Bodnant Pink'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Fernhill'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Queen of Bhutan'Rhododendron Species SelectionSelected By: Goheen. Dr. David , Camas, Washington , USA, 1985 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Rosenoble'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Roseum'Rhododendron Species SelectionSelected By: unknown, 1937 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum 'Tony Schilling'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. arboreum ssp cinnamomeum var cinnamomeumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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