Index

R. 'Howard Kline'

Rhododendron Hybrid

? X ?

Hybridized By: MacMullan, D. (Dennis). Hamburg, Pennsylvania, USA

R. 'Howard Kuhn'

Rhododendron Hybrid

R. degronianum ssp degronianum X R. 'Siouxon x sanguineum ssp sanguineum var haemaleum'

Hybridized By: Kuhn, H.. Muttontown, New York, USA, 1986

R. 'Howard Short'

Rhododendron Hybrid

? X ?

Hybridized By: Short, H.A.

R. 'Howards Roberts'

Rhododendron Hybrid

R. 'Mary Belle' X R. 'Odee Wright'

Hybridized By: Minahan, J.F., 1983

R. 'Hozan'

Azalea Hybrid

R. indicum X ?

Hybridized By: Japan | no hybridiser registration, 1938

R. huadingense

Species

Subgenus: Tsutsusi
Section: Brachycalyx

R. 'Huang Yue'

Azalea Hybrid

? X ?

Hybridized By: unknown, 1980

R. huanum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Fortunea

R. 'Huggy Bear'

Rhododendron Hybrid

? X ?

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

R. 'Hugh Koster'

Rhododendron Hybrid

R. 'George Hardy' X ?

Hybridized By: Koster M. & Sons. Boskoop, Netherlands, 1915

R. 'Hugh Wormald'

Azalea Hybrid

? X ?

Hybridized By: Exbury | The Rothschild Estate, Hampshire | England, 195

R. 'Hugo Koster'

Azalea Hybrid

R. molle ssp molle X R. molle ssp japonicum

Hybridized By: Koster & Sons

R. huguangense

Species

Subgenus: Azaleastrum
Section: Choniastrum

R. huidongense

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Parishia

R. 'Hullaballoo'

Rhododendron Hybrid

? X ?

Hybridized By: Loder, Sir Edmund. Horsham, Sussex, England

R. 'Hultschin'

Rhododendron Hybrid

R. insigne X R. williamsianum

Hybridized By: Robeneck, H.. Westerstede, Germany, 1952

R. 'Humboldt'

Rhododendron Hybrid

R. catawbiense X ?

Hybridized By: Seidel, T.J.. Dresden, Germany, 1906

R. 'Humboldt Peppermint'

Azalea Hybrid

? X ?

Hybridized By: Frisbie, L.F. | Tacoma, Washington | USA

R. 'Humboldt Superior'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Humboldtii'

Rhododendron Hybrid

? X ?

Hybridized By: Standish & Noble. Bagshot, Surrey, England, 1852

R. 'Humbug'

Rhododendron Hybrid

? X ?

Hybridized By: Wildfong, M., 1980

R. 'Humdinger'

Rhododendron Hybrid

? X ?

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

R. 'Humile'

Azalea Hybrid

? X ?

Hybridized By: Loddiges, C. & Sons | Hackney, London | England, 1811

R. 'Humming Bird Group'

Rhododendron Cultivar group

R. haematodes ssp haematodes X R. williamsianum

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

R. 'Hummingbird'

Azalea Hybrid

? X ?

Hybridized By: Coolidge Rare Plant gardens

R. 'Humoreska'

Rhododendron Hybrid

? X ?

Hybridized By: Kavka, B.. Pruhonice, Czech Republic

R. hunanense

Species

Subgenus: Tsutsusi
Section: Tsutsusi

R. 'Huneric'

Rhododendron Hybrid

? X ?

Hybridized By: Waterer (Bagshot). Surrey, England

R. 'Hunnewell'

Rhododendron Hybrid

? X ?

Hybridized By: de Cock, J. & Soeur, 1872

R. hunnewellianum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Argyrophylla

R. 'Hunter's Moon'

Rhododendron Hybrid

? X ?

Hybridized By: Harrison, E.G.W.W.. Bodmin, Cornwall, England

R. 'Hunting Hill'

Rhododendron Hybrid

? X ?

Hybridized By: Dexter, C.O.. Sandwich, MA, USA

R. 'Huntsman Group'

Rhododendron Cultivar group

? X ?

Hybridized By: Unknown

R. 'Hurricane'

Rhododendron Hybrid

R. 'Mrs Furnivall' X R. 'Anna Rose Whitney'

Hybridized By: Whitney, William E.. Brinnon, Washington, USA, 1960

R. 'Huskymania'

Rhododendron Hybrid

R. 'Purpureum Grandiflorum' X ?

Hybridized By: Mehlquist, G.A.L. Storrs, Connecticut, USA, 1963

R. 'Hussar'

Rhododendron Hybrid

R. facetum X R. 'Fabia Group x May Day Group'

Hybridized By: Waterer (Bagshot). Surrey, England, 1970

R. 'Huzzar'

Rhododendron Hybrid

? X ?

Hybridized By: Waterer (Bagshot). Surrey, England, 1865

R. 'Hyacinthiflorum'

Rhododendron Hybrid

R. ponticum X ?

Hybridized By: Cels, 1835

R. hyacinthosmum

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. hybridum

Natural Hybrid

R. maximum X R. viscosum

Subgenus: Pentanthera
Section: Pentanthera
Subsection: Pentanthera

R. 'Hybridum Group'

Azaleodendron Hybrid

R. viscosum X R. maximum

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

R. 'Hydon Ball'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Springbok'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1968

R. 'Hydon Ben'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Billy Budd'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1975

R. 'Hydon Comet'

Rhododendron Hybrid

R. fortunei ssp fortunei X R. 'New Comet'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1978

R. 'Hydon Dawn'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Springbok'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1968

R. 'Hydon Etna'

Rhododendron Hybrid

R. serotinum X R. 'Lava Flow'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 2006

R. 'Hydon Glow'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Springbok'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1968

R. 'Hydon Gold'

Rhododendron Hybrid

R. 'New Comet' X R. 'Crest'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1974

R. 'Hydon Harrier'

Rhododendron Hybrid

R. 'May Day Group' X R. 'Jervis Bay'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1974

R. 'Hydon Hayley'

Rhododendron Hybrid

R. fortunei ssp fortunei X R. 'New Comet'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1978

R. 'Hydon Hunter'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Springbok'

Hybridized By: George A.F.. Hydon Nursery, Godalming, Surrey, England, 1970