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R. 'Nosutchianum'

(R. williamsianum ) X ()

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Require R. williamsianum
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R. 'Albert de Mezey'

Rhododendron Hybrid
R. williamsianum X ?

Hybridized By: Vaartnou, H., 1975

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R. 'Adrastia Group'

Rhododendron Cultivar group
R. williamsianum X R. neriiflorum ssp neriiflorum

Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1946

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R. 'Kimberly'

Rhododendron Hybrid
R. williamsianum X R. fortunei ssp fortunei

Hybridized By: Greer, Harold E.. Eugene, Oregon, USA, 1963

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R. 'Maureen'

Rhododendron Hybrid
R. williamsianum X R. 'Lem's Goal'

Hybridized By: Lem Halfdan. Seattle, Washington, USA, 1973

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R. 'Honingen'

Rhododendron Hybrid
R. williamsianum X R. oreodoxa var oreodoxa

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1965

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R. 'Grayswood Pink'

Rhododendron Hybrid
R. williamsianum X R. venator

Hybridized By: Dowry, G. H., 1949

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R. 'Osmar'

Rhododendron Hybrid
R. williamsianum X ?

Hybridized By: UK, No hybridizer registered, 1965

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R. 'Arthur J. Ivens'

Rhododendron Hybrid
R. williamsianum X R. fortunei ssp discolor

Hybridized By: Ivens, 1932

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R. 'Arab'

Rhododendron Hybrid
R. williamsianum X R. sperabile var sperabile

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1933

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R. 'White Pippin'

Rhododendron Hybrid
R. williamsianum X R. 'Olympic Lady Group'

Hybridized By: Larson, H.L.. Tacoma, Washington, USA, 1954

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R. 'Whisperingrose'

Rhododendron Hybrid
R. williamsianum X R. 'Elizabeth Group'

Hybridized By: Greer, Harold E.. Eugene, Oregon, USA, 1982

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R. 'Cowslip'

Rhododendron Hybrid
R. williamsianum X R. wardii var wardii

Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1930

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R. 'James Barto'

Rhododendron Hybrid
R. williamsianum X R. orbiculare ssp orbiculare

Hybridized By: Barto, James. Eugene, Oregon, USA, 1958

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R. 'Ed Hillary'

Rhododendron Hybrid
R. williamsianum X R. grande

Hybridized By: Campbell, B.W.. Ravensbourne, Dunedin, New Zealand, 1980

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R. 'Ruth Tracy'

Rhododendron Hybrid
R. williamsianum X R. 'Vera Elliott'

Hybridized By: Elliott, W., 1980

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R. 'Jock'

Rhododendron Hybrid
R. williamsianum X R. griersonianum

Hybridized By: Stirling-Maxwell, Sir John, 1939

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R. 'Colina'

Rhododendron Hybrid
R. williamsianum X R. Sir Charles Lemon

Hybridized By: Goheen. Dr. David. Camas, Washington, USA, 1963

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R. 'Mary de Mezey'

Rhododendron Hybrid
R. williamsianum X R. wardii var wardii

Hybridized By: Mezey de, A., 1975

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R. 'Earlybird'

Rhododendron Hybrid
R. williamsianum X R. oreodoxa var fargesii

Hybridized By: Henny, Rudolph. Brooks, Oregon, USA, 1959

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R. 'Dainty Jean'

Rhododendron Hybrid
R. williamsianum X R. 'Helene Schiffner'

Hybridized By: The Bovees Nursery, 1962

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R. 'Moerheim's Pink'

Rhododendron Hybrid
R. williamsianum X R. 'Genoveva'

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1945

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R. 'Mission Bells'

Rhododendron Hybrid
R. williamsianum X R. orbiculare ssp orbiculare

Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1940

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R. 'Brickdust'

Rhododendron Hybrid
R. williamsianum X R. 'Dido Group'

Hybridized By: Henny, Rudolph. Brooks, Oregon, USA, 1960

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R. 'Görlitz'

Rhododendron Hybrid
R. williamsianum X R. 'Rinaldo'

Hybridized By: von Martin, V.. Rothenburg/Oberlausitz, Germany, 1964

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R. 'Easter Bells'

Rhododendron Hybrid
R. williamsianum X R. 'China Group'

Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1966

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R. 'Dormouse Group'

Rhododendron Cultivar group
R. 'Dawn's Delight' X R. williamsianum

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1936

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R. 'High Sheriff'

Rhododendron Hybrid
R. decorum ssp decorum X R. williamsianum

Hybridized By: Williams, F.J., 1960

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R. 'Stadt Essen'

Rhododendron Hybrid
R. 'Louis Pasteur' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1948

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R. 'Elfenbein'

Rhododendron Hybrid
R. 'Adriaan Koster' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1947

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R. 'Moonstone Group'

Rhododendron Cultivar group
R. campylocarpum ssp campylocarpum X R. williamsianum

Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1933

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R. 'August Lamken'

Rhododendron Hybrid
R. 'Doctor V.H. Rutgers' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1942

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R. 'campylocarpum x williamsianum'

Rhododendron Hybrid
R. campylocarpum ssp campylocarpum X R. williamsianum

Hybridized By: No hybridiser registered

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R. 'Vater Böhlje'

Rhododendron Hybrid
R. catawbiense X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1970

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R. 'Loderi White Diamond x williamsianum'

Rhododendron Hybrid
R. 'Loderi White Diamond' X R. williamsianum

Hybridized By: No hybridiser registered

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R. 'Hachmann's Andrea'

Rhododendron Hybrid
R. 'Fantastica' X R. williamsianum

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1986

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R. 'Thomwilliams Group'

Rhododendron Cultivar group
R. thomsonii ssp thomsonii X R. williamsianum

Hybridized By: Magor, E.J.P.. Lamellan, St. Tudy, Cornwall, England, 1921

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R. 'Ladrillo'

Rhododendron Hybrid
R. 'Moonstone Group' X R. williamsianum

Hybridized By: Henny, John. Brooks, Oregon, USA, 1963

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R. 'Veryan Bay'

Rhododendron Hybrid
R. pseudochrysanthum X R. williamsianum

Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1929

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R. 'Karin'

Rhododendron Hybrid
R. 'Britannia' X R. williamsianum

Hybridized By: Boskoop. Research Center fo Arboreus Crops, Netherlands, 1966

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R. 'Temple Belle Group'

Rhododendron Cultivar group
R. orbiculare ssp orbiculare X R. williamsianum

Hybridized By: Kew. Royal Botanical Gardens, Surrey, England, 1916

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R. 'Erich Beeken'

Rhododendron Hybrid
R. 'Britannia' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1955

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R. 'Moonstone Yellow'

Rhododendron Hybrid
R. campylocarpum ssp campylocarpum X R. williamsianum

Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1933

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R. 'Oldenburg Group'

Rhododendron Cultivar group
R. fortunei ssp discolor X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1943

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R. 'Wega Group'

Rhododendron Cultivar group
R. fortunei ssp fortunei 'Sir Charles Butler' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1945

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R. 'Olympic Lady Group'

Rhododendron Cultivar group
R. 'Loderi King George' X R. williamsianum

Hybridized By: Ostbo, E.. Bellevue, Washington, USA, 1954

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R. 'Ivory Bells'

Rhododendron Hybrid
R. chlorops X R. williamsianum

Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1966

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R. 'Brocade'

Rhododendron Hybrid
R. 'Vervaeneanum' X R. williamsianum

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1934

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R. 'Bow Bells Group'

Rhododendron Cultivar group
R. 'Corona' X R. williamsianum

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1934

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R. 'Varna Group'

Rhododendron Cultivar group
R. 'Caman Group' X R. williamsianum

Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1935

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R. 'Tibet'

Rhododendron Hybrid
R. 'Bismarck' X R. williamsianum

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1966

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R. 'Vulcan's Bells'

Rhododendron Hybrid
R. 'Vulcan's Flame' X R. williamsianum

Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1965

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