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R. williamsianum

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R. 'Albert de Mezey' Rhododendron Hybrid R. williamsianum X ? Hybridized By: Vaartnou, H., 1975	More information
R. 'Adrastia Group' Rhododendron Cultivar group R. williamsianum X R. neriiflorum ssp neriiflorum Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1946 More information and pictures
R. 'Kimberly' Rhododendron Hybrid R. williamsianum X R. fortunei ssp fortunei Hybridized By: Greer, Harold E.. Eugene, Oregon, USA, 1963 More information and pictures
R. 'Maureen' Rhododendron Hybrid R. williamsianum X R. 'Lem's Goal' Hybridized By: Lem Halfdan. Seattle, Washington, USA, 1973 More information and pictures
R. 'Honingen' Rhododendron Hybrid R. williamsianum X R. oreodoxa var oreodoxa Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1965	More information
R. 'Grayswood Pink' Rhododendron Hybrid R. williamsianum X R. venator Hybridized By: Dowry, G. H., 1949	More information
R. 'Osmar' Rhododendron Hybrid R. williamsianum X ? Hybridized By: UK, No hybridizer registered, 1965 More information and pictures
R. 'Arthur J. Ivens' Rhododendron Hybrid R. williamsianum X R. fortunei ssp discolor Hybridized By: Ivens, 1932 More information and pictures
R. 'Nosutchianum' Rhododendron Hybrid R. williamsianum X ? Hybridized By: Lem Halfdan. Seattle, Washington, USA, 1956 More information and pictures
R. 'Arab' Rhododendron Hybrid R. williamsianum X R. sperabile var sperabile Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1933	More information
R. 'White Pippin' Rhododendron Hybrid R. williamsianum X R. 'Olympic Lady Group' Hybridized By: Larson, H.L.. Tacoma, Washington, USA, 1954 More information and pictures
R. 'Whisperingrose' Rhododendron Hybrid R. williamsianum X R. 'Elizabeth Group' Hybridized By: Greer, Harold E.. Eugene, Oregon, USA, 1982	More information
R. 'Cowslip' Rhododendron Hybrid R. williamsianum X R. wardii var wardii Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1930 More information and pictures
R. 'James Barto' Rhododendron Hybrid R. williamsianum X R. orbiculare ssp orbiculare Hybridized By: Barto, James. Eugene, Oregon, USA, 1958 More information and pictures
R. 'Ed Hillary' Rhododendron Hybrid R. williamsianum X R. grande Hybridized By: Campbell, B.W.. Ravensbourne, Dunedin, New Zealand, 1980	More information
R. 'Ruth Tracy' Rhododendron Hybrid R. williamsianum X R. 'Vera Elliott' Hybridized By: Elliott, W., 1980	More information
R. 'Jock' Rhododendron Hybrid R. williamsianum X R. griersonianum Hybridized By: Stirling-Maxwell, Sir John, 1939 More information and pictures
R. 'Colina' Rhododendron Hybrid R. williamsianum X R. Sir Charles Lemon Hybridized By: Goheen. Dr. David. Camas, Washington, USA, 1963	More information
R. 'Mary de Mezey' Rhododendron Hybrid R. williamsianum X R. wardii var wardii Hybridized By: Mezey de, A., 1975	More information
R. 'Earlybird' Rhododendron Hybrid R. williamsianum X R. oreodoxa var fargesii Hybridized By: Henny, Rudolph. Brooks, Oregon, USA, 1959	More information
R. 'Dainty Jean' Rhododendron Hybrid R. williamsianum X R. 'Helene Schiffner' Hybridized By: The Bovees Nursery, 1962	More information
R. 'Moerheim's Pink' Rhododendron Hybrid R. williamsianum X R. 'Genoveva' Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1945	More information
R. 'Mission Bells' Rhododendron Hybrid R. williamsianum X R. orbiculare ssp orbiculare Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1940 More information and pictures
R. 'Brickdust' Rhododendron Hybrid R. williamsianum X R. 'Dido Group' Hybridized By: Henny, Rudolph. Brooks, Oregon, USA, 1960 More information and pictures
R. 'Görlitz' Rhododendron Hybrid R. williamsianum X R. 'Rinaldo' Hybridized By: von Martin, V.. Rothenburg/Oberlausitz, Germany, 1964	More information
R. 'Easter Bells' Rhododendron Hybrid R. williamsianum X R. 'China Group' Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1966	More information
R. 'Dormouse Group' Rhododendron Cultivar group R. 'Dawn's Delight' X R. williamsianum Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1936 More information and pictures
R. 'High Sheriff' Rhododendron Hybrid R. decorum ssp decorum X R. williamsianum Hybridized By: Williams, F.J., 1960 More information and pictures
R. 'Stadt Essen' Rhododendron Hybrid R. 'Louis Pasteur' X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1948 More information and pictures
R. 'Elfenbein' Rhododendron Hybrid R. 'Adriaan Koster' X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1947 More information and pictures
R. 'Moonstone Group' Rhododendron Cultivar group R. campylocarpum ssp campylocarpum X R. williamsianum Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1933 More information and pictures
R. 'August Lamken' Rhododendron Hybrid R. 'Doctor V.H. Rutgers' X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1942 More information and pictures
R. 'campylocarpum x williamsianum' Rhododendron Hybrid R. campylocarpum ssp campylocarpum X R. williamsianum Hybridized By: No hybridiser registered	More information
R. 'Vater Böhlje' Rhododendron Hybrid R. catawbiense X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1970 More information and pictures
R. 'Loderi White Diamond x williamsianum' Rhododendron Hybrid R. 'Loderi White Diamond' X R. williamsianum Hybridized By: No hybridiser registered	More information
R. 'Hachmann's Andrea' Rhododendron Hybrid R. 'Fantastica' X R. williamsianum Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1986	More information
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 More information and pictures
R. 'Ladrillo' Rhododendron Hybrid R. 'Moonstone Group' X R. williamsianum Hybridized By: Henny, John. Brooks, Oregon, USA, 1963	More information
R. 'Veryan Bay' Rhododendron Hybrid R. pseudochrysanthum X R. williamsianum Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1929	More information
R. 'Karin' Rhododendron Hybrid R. 'Britannia' X R. williamsianum Hybridized By: Boskoop. Research Center fo Arboreus Crops, Netherlands, 1966 More information and pictures
R. 'Temple Belle Group' Rhododendron Cultivar group R. orbiculare ssp orbiculare X R. williamsianum Hybridized By: Kew. Royal Botanical Gardens, Surrey, England, 1916 More information and pictures
R. 'Erich Beeken' Rhododendron Hybrid R. 'Britannia' X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1955 More information and pictures
R. 'Moonstone Yellow' Rhododendron Hybrid R. campylocarpum ssp campylocarpum X R. williamsianum Hybridized By: Williams, John Charles. Caerhays, Cornwall, England, 1933 More information and pictures
R. 'Oldenburg Group' Rhododendron Cultivar group R. fortunei ssp discolor X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1943	More information
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	More information
R. 'Olympic Lady Group' Rhododendron Cultivar group R. 'Loderi King George' X R. williamsianum Hybridized By: Ostbo, E.. Bellevue, Washington, USA, 1954 More information and pictures
R. 'Ivory Bells' Rhododendron Hybrid R. chlorops X R. williamsianum Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA, 1966	More information
R. 'Brocade' Rhododendron Hybrid R. 'Vervaeneanum' X R. williamsianum Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1934 More information and pictures
R. 'Bow Bells Group' Rhododendron Cultivar group R. 'Corona' X R. williamsianum Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1934 More information and pictures
R. 'Varna Group' Rhododendron Cultivar group R. 'Caman Group' X R. williamsianum Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1935	More information
R. 'Tibet' Rhododendron Hybrid R. 'Bismarck' X R. williamsianum Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1966 More information and pictures

Offspring Search

R. williamsianum

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R. 'Albert de Mezey'

Rhododendron Hybrid

R. williamsianum X ?

More information

R. 'Adrastia Group'

Rhododendron Cultivar group

R. williamsianum X R. neriiflorum ssp neriiflorum

R. 'Kimberly'

Rhododendron Hybrid

R. williamsianum X R. fortunei ssp fortunei

R. 'Maureen'

Rhododendron Hybrid

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

R. 'Honingen'

Rhododendron Hybrid

R. williamsianum X R. oreodoxa var oreodoxa

More information

R. 'Grayswood Pink'

Rhododendron Hybrid

R. williamsianum X R. venator

More information

R. 'Osmar'

Rhododendron Hybrid

R. williamsianum X ?

R. 'Arthur J. Ivens'

Rhododendron Hybrid

R. williamsianum X R. fortunei ssp discolor

R. 'Nosutchianum'

Rhododendron Hybrid

R. williamsianum X ?

R. 'Arab'

Rhododendron Hybrid

R. williamsianum X R. sperabile var sperabile

More information

R. 'White Pippin'

Rhododendron Hybrid

R. williamsianum X R. 'Olympic Lady Group'

R. 'Whisperingrose'

Rhododendron Hybrid

R. williamsianum X R. 'Elizabeth Group'

More information

R. 'Cowslip'

Rhododendron Hybrid

R. williamsianum X R. wardii var wardii

R. 'James Barto'

Rhododendron Hybrid

R. williamsianum X R. orbiculare ssp orbiculare

R. 'Ed Hillary'

Rhododendron Hybrid

R. williamsianum X R. grande

More information

R. 'Ruth Tracy'

Rhododendron Hybrid

R. williamsianum X R. 'Vera Elliott'

More information

R. 'Jock'

Rhododendron Hybrid

R. williamsianum X R. griersonianum

R. 'Colina'

Rhododendron Hybrid

R. williamsianum X R. Sir Charles Lemon

More information

R. 'Mary de Mezey'

Rhododendron Hybrid

R. williamsianum X R. wardii var wardii

More information

R. 'Earlybird'

Rhododendron Hybrid

R. williamsianum X R. oreodoxa var fargesii

More information

R. 'Dainty Jean'

Rhododendron Hybrid

R. williamsianum X R. 'Helene Schiffner'

More information

R. 'Moerheim's Pink'

Rhododendron Hybrid

R. williamsianum X R. 'Genoveva'