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R. 'aureum x maximum'Rhododendron HybridR. aureum var aureum X R. maximumHybridized By: No hybridiser registered |
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R. 'Whizette'Rhododendron HybridR. 'Princess Elizabeth' X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1992 |
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R. 'Ignescens'Rhododendron HybridR. arboreum ssp arboreum X R. maximumHybridized By: Rogers, W.H. & Son, 1932 |
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R. 'Hypermax'Rhododendron HybridR. hyperythrum X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1999 More information and pictures |
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R. 'Russell Harmon'Rhododendron HybridR. catawbiense X R. maximumHybridized By: Harmon, R., 1950 More information and pictures |
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R. 'Ghost'Rhododendron HybridR. 'maximum x yakushimanum' X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1974 |
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R. 'Mrs Sam'Rhododendron HybridR. catawbiense X R. maximumHybridized By: Unknown More information and pictures |
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R. 'Edith Pride'Rhododendron HybridR. 'English Roseum' X R. maximumHybridized By: Pride, O.S.. Butler, Pennsylvania, USA, 1958 More information and pictures |
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R. 'Golly Gee'Rhododendron HybridR. 'Donna Hardgrove' X R. maximumHybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1977 |
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R. 'Jean Leppo'Rhododendron HybridR. catawbiense X R. maximumHybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1969 |
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R. 'Seven Up'Rhododendron HybridR. aureum var aureum X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1995 |
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R. 'yakushimanum x maximum'Rhododendron HybridR. degronianum ssp yakushimanum X R. maximumHybridized By: No hybridiser registered |
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R. 'Dona Maria'Rhododendron HybridR. ponticum X R. maximumHybridized By: de Clerck d'Olsene, 1855 |
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R. 'Powerhouse'Rhododendron HybridR. 'America x Doctor V.H. Rutgers' X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1974 More information and pictures |
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R. 'Ponticum Roseum'Rhododendron HybridR. ponticum X R. maximumHybridized By: Pride, O.S.. Butler, Pennsylvania, USA, 1958 More information and pictures |
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R. 'Delp's Snowball'Rhododendron HybridR. aureum var aureum X R. maximumHybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1995 |
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R. 'Halopeanum'Azalea HybridR. griffithianum X R. maximumHybridized By: Halopé, F, 1896 More information and pictures |
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R. 'Hybridum Group'Azaleodendron HybridR. viscosum X R. maximumHybridized By: Herbert, Honourable & Reverend W. | Wetherby, Yorkshire | England, 1817 |
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R. 'ponticum x maximum'Azaleodendron HybridR. ponticum X R. maximumHybridized By: No hybridiser registered |
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R. 'Queen Victoria'Rhododendron HybridR. maximum X R. 'Altaclerense Group'Hybridized By: Standish & Noble. Bagshot, Surrey, England, 1850 |
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R. 'Alumni Day'Rhododendron HybridR. maximum X R. fortunei ssp discolorHybridized By: Nearing, G.G.. Ramsey, NJ, USA, 1958 |
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R. 'Cool Trend'Rhododendron HybridR. maximum X R. 'Buttermint'Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1986 |
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R. 'Elizabeth Scholtz'Rhododendron HybridR. maximum X ?Hybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1962 |
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R. 'Lady Annette de Trafford'Rhododendron HybridR. maximum X ?Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1874 More information and pictures |
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R. 'Lady Eleanor Cathcart'Rhododendron HybridR. maximum X R. arboreum ssp arboreumHybridized By: Waterer John, Sons & Crisp. Bagshot, Surrey, UK, 1850 More information and pictures |
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R. 'Mademoiselle Marie van Houtte'Rhododendron HybridR. maximum X ?Hybridized By: Van Houtte, L. B. (Louis Benoit). Gentbrugge, Belgium, 1879 More information and pictures |
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R. 'Alarm'Rhododendron HybridR. maximum X ?Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1860 More information and pictures |
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R. 'July Possibility'Rhododendron HybridR. maximum X R. 'Ponticum Roseum'Hybridized By: Scott Arboretum, 1953 |
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R. 'Independence Day'Rhododendron HybridR. maximum X ?Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1915 More information and pictures |
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R. 'Summer Snow'Rhododendron HybridR. maximum X R. 'ungernii x auriculatum'Hybridized By: Leach, Dr. David G.. North Madison, Ohio, USA, 1969 More information and pictures |
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R. 'Late Beginning'Rhododendron HybridR. maximum X R. 'C.S. Sargent'Hybridized By: Scott Arboretum, 1953 |
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R. 'Angel Glow'Rhododendron HybridR. maximum X R. degronianum ssp yakushimanum 'Koichiro Wada'Hybridized By: Unknown |
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R. 'Adele's Yellow'Rhododendron HybridR. maximum X R. wardii var wardiiHybridized By: Fetterhoff, W.M.. Gibsonia, Pennsylvania, USA, 1964 |
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R. 'maximum x haematodes'Rhododendron HybridR. maximum X R. haematodes ssp haematodesHybridized By: Unknown |
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R. 'Florence Rinehimer'Rhododendron HybridR. maximum X ?Hybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1971 |
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R. 'Stokes Bronze Wings'Rhododendron HybridR. maximum X R. catawbienseHybridized By: Stokes, W.E., 1943 |
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R. 'maximum x yakushimanum'Rhododendron HybridR. maximum X R. degronianum ssp yakushimanumHybridized By: No hybridiser registered |
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R. 'Harold Amateis'Rhododendron HybridR. maximum X R. strigillosumHybridized By: Amateis, Edmond. Brewster, New York, USA, 1967 More information and pictures |
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R. 'Lady Clementine Mitford'Rhododendron HybridR. maximum X ?Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1870 More information and pictures |
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R. 'Late Arrival'Rhododendron HybridR. maximum X R. 'C.S. Sargent'Hybridized By: Scott Arboretum, 1953 |
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R. 'Jason's Maxim'Rhododendron HybridR. maximum X ?Hybridized By: Bowers, C.G., 1927 |
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R. 'Folcroft'Rhododendron HybridR. maximum X R. 'maximum x fortunei'Hybridized By: Scott Arboretum, 1958 |
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R. 'Doctor Denis Percell'Rhododendron HybridR. maximum X R. 'Leo Group'Hybridized By: Goodrich, J.M. (Jane) & Ray. Vienna, Virginia, USA, 1971 |
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R. 'maximum x catawbiense'Rhododendron HybridR. maximum X R. catawbienseHybridized By: No hybridiser registered |
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R. 'Marchioness of Lansdowne'Rhododendron HybridR. maximum X ?Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1879 More information and pictures |
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R. 'June Magic'Rhododendron HybridR. maximum X R. fortunei ssp discolorHybridized By: Scott Arboretum, 1953 |
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R. 'Alandale'Rhododendron HybridR. maximum X R. fortunei ssp discolorHybridized By: Nearing, G.G.. Ramsey, NJ, USA, 1938 |
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R. 'Baccalaureate'Rhododendron HybridR. maximum X R. fortunei ssp discolorHybridized By: Gable, J.B.. Stewartstown, Pennsylvania, USA, 1972 |
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R. 'Othello'Rhododendron HybridR. maximum X ?Hybridized By: Standish & Noble. Bagshot, Surrey, England, 1847 |
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R. 'Susan Kay'Rhododendron HybridR. maximum X R. wardii var wardiiHybridized By: Fetterhoff, W.M.. Gibsonia, Pennsylvania, USA, 1964 |
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R. 'Edith'Rhododendron HybridR. maximum X ?Hybridized By: Pride, O.S.. Butler, Pennsylvania, USA, 1978 |
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