Index

R. 'Hermes'

Azalea Hybrid

? X ?

Hybridized By: Seidel, T.J.H. | Dresden | Germany, 1928

R. 'Hermine Seidel'

Rhododendron Hybrid

? X ?

Hybridized By: Seidel, T.J.R.. Dresden/Grüngräbchen, Germany

R. 'Hernando'

Rhododendron Hybrid

? X ?

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

R. 'Hero'

Rhododendron Hybrid

R. 'Gloria Ganavensis' X R. catawbiense

Hybridized By: Seidel, T.J.R.. Dresden/Grüngräbchen, Germany, 1906

R. 'Hershey's Orange'

Azalea Hybrid

? X ?

Hybridized By: Hershey, R.

R. 'Hershey's Red'

Azalea Hybrid

? X ?

Hybridized By: Hershey, R.

R. 'Hershey's Red Tetra'

Azalea Hybrid

? X ?

Hybridized By: USDA, Department of Agriculture | Beltsville, Maryland | USA

R. herzogii

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. 'herzogii x laetum'

Vireya Hybrid

R. herzogii X R. laetum

Hybridized By: No hybridiser registered

R. 'Hesse's Biggi'

Rhododendron Hybrid

? X ?

Hybridized By: Hesse, H., 1996

R. 'Hesse's Nerisha'

Rhododendron Hybrid

? X ?

Hybridized By: Hesse, H., 1999

R. heteroclitum

Species

Subgenus: Rhododendron
Section: Pogonanthum

R. heterolepis

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. 'Heureuse Surprise'

Azalea Hybrid

? X ?

Hybridized By: Sunningdale Nursery, 1855

R. 'Hexe'

Azalea Hybrid

R. 'Amoenum' X R. 'Duc de Nassau'

Hybridized By: Forster, O. | Lehenhof | Austria, 1878

R. 'Hexe de Saffelaere'

Azalea Hybrid

R. 'Professeur Wolters' X R. 'Hexe'

Hybridized By: Van Hecke, A., 1934

R. 'Hexe Grandiflora'

Azalea Hybrid

? X ?

Hybridized By: Haerens, A. | St. Amandsberg | Belgium, 1937

R. 'Hexe Grandis'

Azalea Hybrid

? X ?

Hybridized By: Haerens, A. | St. Amandsberg | Belgium, 1933

R. 'Hexe Prima'

Azalea Hybrid

? X ?

Hybridized By: Steyaert, A., 1936

R. 'Hexe Rosea'

Azalea Hybrid

? X ?

Hybridized By: Haerens, A. | St. Amandsberg | Belgium, 1907

R. 'Hexe x Ernst Thiers'

Azalea Hybrid

R. 'Hexe' X R. 'Ernst Thiers'

Hybridized By: No hybridiser registered

R. 'Hexe x Vervaeneanum'

Azalea Hybrid

R. 'Hexe' X R. 'Vervaeneanum'

Hybridized By: No IRRC registration data | for hybridiser

R. 'Hi Tech'

Rhododendron Hybrid

R. 'minus Carolinianum Group x fastigiatum' X R. 'minus Carolinianum Group x Blue Diamond'

Hybridized By: Looye, Jack. Niagara on the Lake, Ontario, Canada, 1984

R. 'Hiawatha'

Rhododendron Hybrid

? X ?

Hybridized By: Stokes, W.E., 1969

R. 'Hiawatha'

Azalea Hybrid

? X ?

Hybridized By: Waterer, H. (Knaphill) | Woking, Surrey (Knaphill) | UK, 1952

R. 'Hiawatha'

Azalea Hybrid

? X ?

Hybridized By: Pericat, A., 1942

R. 'Hiawatha'

Azalea Hybrid

? X ?

Hybridized By: Bobbink & Atkins | East Rutherford, New Jersey | USA, 1950

R. 'Hiawatha'

Azalea Hybrid

? X ?

Hybridized By: Sander, C., 1885

R. 'Hiawatha Group'

Rhododendron Cultivar group

? X ?

Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1929

R. hidakanum

Species

Subgenus: Tsutsusi
Section: Brachycalyx

R. 'Higasa'

Azalea Hybrid

X

Hybridized By: Japan | no hybridiser registration, 1955

R. 'High Gold'

Rhododendron Hybrid

R. 'Damaris Group' X R. 'Crest'

Hybridized By: Eichelser, John E.. Olympia, Washington, USA, 1982

R. 'High Regard'

Rhododendron Hybrid

R. fortunei ssp discolor X R. 'maximum x fortunei'

Hybridized By: Scott Arboretum, 1958

R. 'High Sheriff'

Rhododendron Hybrid

R. decorum ssp decorum X R. williamsianum

Hybridized By: Williams, F.J., 1960

R. 'High Society'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. dichroanthum ssp scyphocalyx

Hybridized By: Boswells Nurseries, 1971

R. 'High Summer'

Rhododendron Hybrid

R. 'Mrs J G Millais' X R. 'Inamorata Group'

Hybridized By: Millais, E.G., 1963

R. 'High Tide'

Azalea Hybrid

? X ?

Hybridized By: Aromi, E.J | Mobile, Alabama | USA

R. 'High Times'

Azalea Hybrid

? X ?

Hybridized By: Aromi, E.J | Mobile, Alabama | USA

R. 'High Voltage'

Rhododendron Hybrid

R. 'Yak Van Zile x Mrs W R Coe' X R. 'Dead Ringer'

Hybridized By: Trautmann, C.. Mowbray Gardens, Amelia, Ohio, USA, 1995

R. 'Highborn'

Rhododendron Hybrid

R. nuttallii X R. 'Alf Bramley'

Hybridized By: O'Rourke, H.. Burnie, Tasmania, Australia, 1990

R. 'Highland Arabesque'

Vireya Hybrid

R. orbiculatum X R. 'laetum x aurigeranum'

Hybridized By: Rouse, J.L.. Toorak, Victoria, Australia, 1983

R. 'Highland Flynn'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Highnoon'

Rhododendron Hybrid

R. 'Earl of Athlone' X R. 'Fabia Group'

Hybridized By: Henny, Rudolph. Brooks, Oregon, USA, 1944

R. 'Hilda Margaret'

Rhododendron Hybrid

R. 'Carita Group' X R. fortunei ssp fortunei

Hybridized By: Reuthe, W.S., 1970

R. 'Hilda Niblett'

Azalea Hybrid

R. 'Glacier x Tama-giku' X R. 'Getsutoku'

Hybridized By: Gartrell, R. D. | Highland Farms, Black Mountain, North Carolina | USA, 1962

R. 'Hildegard'

Rhododendron Hybrid

? X ?

Hybridized By: Seidel, T.J.. Dresden, Germany, 1918

R. 'Hill Ayah'

Rhododendron Hybrid

R. fortunei ssp discolor X R. facetum

Hybridized By: Magor, E.J.P.. Lamellan, St. Tudy, Cornwall, England, 1965

R. 'Hill's Bright Red'

Rhododendron Hybrid

R. 'Elizabeth Group' X R. 'Kilimanjaro Group'

Hybridized By: Hill, W.. Poulsbo, Washington, USA, 1988

R. 'Hill's Low Red'

Rhododendron Hybrid

? X ?

Hybridized By: Hill, W.. Poulsbo, Washington, USA, 1975

R. 'Hillcrest'

Rhododendron Hybrid

? X ?

Hybridized By: Esch, B.. Portland, Oregon, USA, 1960

R. 'Hille'

Rhododendron Hybrid

R. 'Graf Lennart' X R. irroratum ssp irroratum 'Polka Dot'

Hybridized By: Wieting, J.. Baumschulen, Gisselhorst/Westerstede, Germany, 1984