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| R. maximum 'Album'Rhododendron Species SelectionSelected By: Whitley & Osborn, 1826 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Ashleyi'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. maximum 'Great Laurel'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. maximum 'Harkness'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Independence'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Leachii'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Little's Enchanting Shells'Rhododendron Species SelectionSelected By: Little, P.L. , Piping Tree Gardens, Beaverdam, Virgina , USA, 1990 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Marginatum'Rhododendron Species SelectionSelected By: Leroy, A. , Angers , France, 1868 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Mount Mitchell'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
                 | More information | 
| R. maximum 'Nassau Red'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Rosebay'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. maximum 'Summertime'Rhododendron Species SelectionSelected By: Crown Estate Commissioners , Windsor, Berkshire , England, 1974 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. meddianum var atrokermesinumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. meddianum var meddianumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. mengtszenseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. microgynumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. microgynum Gymnocarpum GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. mimetes var mimetesSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. mimetes var simulansSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. miyienseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. monosematumNatural HybridR. pachytrichum X R. strigillosum
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. monosematum 'Blackhills'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. montiganumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. montroseanumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. montroseanum 'Baravalla'Rhododendron Species SelectionSelected By: unknown, 1994 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. montroseanum 'Benmore'Rhododendron Species SelectionSelected By: Younger Botanic Garden, 1957 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. moriiSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. nakotiltumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp agetumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp neriiflorumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp neriiflorum Euchaites GroupSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp neriiflorum 'Lamellen'Rhododendron Species SelectionSelected By: UK, No hybridizer registered, 1988 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp neriiflorum 'Rosevallon'Rhododendron Species SelectionSelected By: unknown, 1935 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. neriiflorum ssp phaedropumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. nhatrangenseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. nicroglandulosumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. nikomontanumNatural HybridR. aureum var aureum X R. brachycarpum ssp brachycarpum
            
                Subgenus: 
                
                        Mumeazalea
                    
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| R. ningyuenenseSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. niveumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. niveum 'Clyne Castle'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. niveum 'Crown Equerry'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. nymphaeoidesSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. oblancifoliumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. ochraceumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. oligocarpumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. ombrocharesSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. orbiculare ssp cardiobasisSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. orbiculare ssp orbiculareSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. orbiculare ssp orbiculare 'Painted Snipe'Rhododendron Species SelectionSelected By: Unknown 
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. oreodoxa var adenostylosumSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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| R. oreodoxa var fargesiiSpecies
            
                Subgenus: 
                
                        Hymenanthes
                    
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