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R. 'Whizette'

(R. 'Princess Elizabeth') X (R. maximum )

Require Seed X Pollen in the Same Positions
Require R. 'Princess Elizabeth'
Require R. maximum
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R. 'Peppermint Twist'

Rhododendron Hybrid
R. hyperythrum X R. 'Princess Elizabeth'

Hybridized By: Thornton, J.T., 1992

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R. 'catawbiense x Mars X Princess Elizabeth'

Rhododendron Hybrid
R. 'catawbiense x Mars' X R. 'Princess Elizabeth'

Hybridized By: No hybridiser registered

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R. 'Jennifer Harris'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'smirnowii x yakushimanum'

Hybridized By: Moyers, R., 1975

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R. 'Wendy Lyn'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'smirnowii x yakushimanum'

Hybridized By: Moyers, R., 1975

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R. 'Lanny Pride'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'smirnowii x yakushimanum'

Hybridized By: Moyers, R., 1975

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R. 'Alley Oops'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'Fiery Orange'

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1988

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R. 'Delp's Cheers'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'Sultry Peach'

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1988

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R. 'Gotlots'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'Oh My!'

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1992

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R. 'Princess Elizabeth X smirnowii x yakushimanum'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'smirnowii x yakushimanum'

Hybridized By: Unknown

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R. 'Connie Stanton'

Rhododendron Hybrid
R. 'Princess Elizabeth' X R. 'Boule de Neige'

Hybridized By: Stanton, E.N., 1968

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R. 'aureum x maximum'

Rhododendron Hybrid
R. aureum var aureum X R. maximum

Hybridized By: No hybridiser registered

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R. 'Ignescens'

Rhododendron Hybrid
R. arboreum ssp arboreum X R. maximum

Hybridized By: Rogers, W.H. & Son, 1932

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R. 'Hypermax'

Rhododendron Hybrid
R. hyperythrum X R. maximum

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1999

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R. 'Russell Harmon'

Rhododendron Hybrid
R. catawbiense X R. maximum

Hybridized By: Harmon, R., 1950

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R. 'Ghost'

Rhododendron Hybrid
R. 'maximum x yakushimanum' X R. maximum

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1974

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R. 'Mrs Sam'

Rhododendron Hybrid
R. catawbiense X R. maximum

Hybridized By: Unknown

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R. 'Edith Pride'

Rhododendron Hybrid
R. 'English Roseum' X R. maximum

Hybridized By: Pride, O.S.. Butler, Pennsylvania, USA, 1958

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R. 'Golly Gee'

Rhododendron Hybrid
R. 'Donna Hardgrove' X R. maximum

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1977

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R. 'Jean Leppo'

Rhododendron Hybrid
R. catawbiense X R. maximum

Hybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1969

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R. 'Seven Up'

Rhododendron Hybrid
R. aureum var aureum X R. maximum

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1995

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R. 'yakushimanum x maximum'

Rhododendron Hybrid
R. degronianum ssp yakushimanum X R. maximum

Hybridized By: No hybridiser registered

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R. 'Dona Maria'

Rhododendron Hybrid
R. ponticum X R. maximum

Hybridized By: de Clerck d'Olsene, 1855

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R. 'Powerhouse'

Rhododendron Hybrid
R. 'America x Doctor V.H. Rutgers' X R. maximum

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1974

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R. 'Ponticum Roseum'

Rhododendron Hybrid
R. ponticum X R. maximum

Hybridized By: Pride, O.S.. Butler, Pennsylvania, USA, 1958

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R. 'Delp's Snowball'

Rhododendron Hybrid
R. aureum var aureum X R. maximum

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1995

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R. 'Halopeanum'

Azalea Hybrid
R. griffithianum X R. maximum

Hybridized By: Halopé, F, 1896

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R. 'Hybridum Group'

Azaleodendron Hybrid
R. viscosum X R. maximum

Hybridized By: Herbert, Honourable & Reverend W. | Wetherby, Yorkshire | England, 1817

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R. 'ponticum x maximum'

Azaleodendron Hybrid
R. ponticum X R. maximum

Hybridized By: No hybridiser registered

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R. 'Queen Victoria'

Rhododendron Hybrid
R. maximum X R. 'Altaclerense Group'

Hybridized By: Standish & Noble. Bagshot, Surrey, England, 1850

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R. 'Alumni Day'

Rhododendron Hybrid
R. maximum X R. fortunei ssp discolor

Hybridized By: Nearing, G.G.. Ramsey, NJ, USA, 1958

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R. 'Cool Trend'

Rhododendron Hybrid
R. maximum X R. 'Buttermint'

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1986

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R. 'Eileen'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Waterer (Bagshot). Surrey, England, 1920

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R. 'Elizabeth Scholtz'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1962

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R. 'Lady Annette de Trafford'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1874

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R. 'Lady Eleanor Cathcart'

Rhododendron Hybrid
R. maximum X R. arboreum ssp arboreum

Hybridized By: Waterer John, Sons & Crisp. Bagshot, Surrey, UK, 1850

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R. 'Mademoiselle Marie van Houtte'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Van Houtte, L. B. (Louis Benoit). Gentbrugge, Belgium, 1879

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R. 'Alarm'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1860

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R. 'July Possibility'

Rhododendron Hybrid
R. maximum X R. 'Ponticum Roseum'

Hybridized By: Scott Arboretum, 1953

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R. 'Independence Day'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1915

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R. 'Summer Snow'

Rhododendron Hybrid
R. maximum X R. 'ungernii x auriculatum'

Hybridized By: Leach, Dr. David G.. North Madison, Ohio, USA, 1969

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R. 'Late Beginning'

Rhododendron Hybrid
R. maximum X R. 'C.S. Sargent'

Hybridized By: Scott Arboretum, 1953

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R. 'Angel Glow'

Rhododendron Hybrid
R. maximum X R. degronianum ssp yakushimanum 'Koichiro Wada'

Hybridized By: Unknown

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R. 'Adele's Yellow'

Rhododendron Hybrid
R. maximum X R. wardii var wardii

Hybridized By: Fetterhoff, W.M.. Gibsonia, Pennsylvania, USA, 1964

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R. 'maximum x haematodes'

Rhododendron Hybrid
R. maximum X R. haematodes ssp haematodes

Hybridized By: Unknown

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R. 'Florence Rinehimer'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Smith, W.D.. Spring Grove, Pennsylvania, USA, 1971

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R. 'Stokes Bronze Wings'

Rhododendron Hybrid
R. maximum X R. catawbiense

Hybridized By: Stokes, W.E., 1943

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R. 'maximum x yakushimanum'

Rhododendron Hybrid
R. maximum X R. degronianum ssp yakushimanum

Hybridized By: No hybridiser registered

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R. 'Harold Amateis'

Rhododendron Hybrid
R. maximum X R. strigillosum

Hybridized By: Amateis, Edmond. Brewster, New York, USA, 1967

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R. 'Lady Clementine Mitford'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1870

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R. 'Late Arrival'

Rhododendron Hybrid
R. maximum X R. 'C.S. Sargent'

Hybridized By: Scott Arboretum, 1953

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R. 'Jason's Maxim'

Rhododendron Hybrid
R. maximum X ?

Hybridized By: Bowers, C.G., 1927

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