Index

R. 'Rhodsoc'

Rhododendron Hybrid

? X ?

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

R. 'Rhodstar'

Rhododendron Hybrid

? X ?

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

R. 'Rhodunter 10'

Rhododendron Hybrid

? X ?

Hybridized By: Preil, W. & Ebbinghaus, R.

R. 'Rhodunter 48'

Rhododendron Hybrid

R. fortunei ssp fortunei X R. 'Cunningham's White'

Hybridized By: Preil, W. & Ebbinghaus, R., 1980

R. 'Rhodworks'

Rhododendron Hybrid

? X ?

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

R. 'Rhody Gus'

Rhododendron Hybrid

? X ?

Hybridized By: Cowles, J.C.. Stow, MA (superintendent of Dexter Estate 1959-1967), USA, 1970

R. 'Rhody Romance'

Rhododendron Hybrid

? X ?

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

R. rhombicum var albiflorum

Species

R. rhombifolium

Species

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Maddenia

R. 'Rhonda'

Rhododendron Hybrid

R. 'Marion' X R. 'Coronation Day'

Hybridized By: Boulter, V.J., 1984

R. rhuyuenense

Species

Subgenus: Tsutsusi
Section: Tsutsusi

R. 'Rhys'

Rhododendron Hybrid

R. 'Apricot Ice' X R. 'Apricot Gold'

Hybridized By: Van de Ven K.. Olinda, Victoria, Australia, 1983

R. 'Ria Hardijzer'

Azaleodendron Hybrid

R. racemosum X R. 'Hinodegiri'

Hybridized By: Hardijzer W. H. | Boskoop | Netherlands

R. 'Ribble'

Azalea Hybrid

? X ?

Hybridized By: Hanger, F.E.W. | RHS Garden, Wisley, Surrey | England

R. 'Ribbon Candy'

Azalea Hybrid

R. viscosum X R. arborescens

Hybridized By: Mezitt, E.V. | Weston Nurseries, Hopkinton, Massachusetts | USA, 1965

R. 'Ribera'

Azalea Hybrid

? X ?

Hybridized By: Smet-Duvivier. L. de | St. Amandsberg | Belgium, 1888

R. 'Ricarda'

Rhododendron Hybrid

R. 'Hachmann's Diadem' X R. 'Holger'

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1979

R. 'Rich Amber'

Vireya Hybrid

X

Hybridized By: Unknown

R. 'Rich Mine'

Rhododendron Hybrid

? X ?

Hybridized By: Tolstead, W.L.. Davis and Elkins College, Elkins, WV, USA

R. 'Richard Bosley'

Rhododendron Hybrid

? X ?

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

R. 'Richard Cree'

Rhododendron Hybrid

R. 'Etta Burrows' X R. 'yakushimanun-hybrid x barbatum'

Hybridized By: Watson, E.M. Mrs. (Elsie). Kirkland, WA, USA, 1995

R. 'Richard Gill'

Rhododendron Hybrid

R. fortunei ssp fortunei X R. thomsonii ssp thomsonii

Hybridized By: Gill, Richards & Sons. Penryn, Cornwall, England, 1920

R. 'Richard Gregory'

Rhododendron Hybrid

R. auriculatum X R. kyawii

Hybridized By: Gregory, R.M., 1955

R. 'Richard Holman'

Azalea Hybrid

? X ?

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

R. 'Richard Marques'

Vireya Hybrid

X R. laetum

Hybridized By: Unknown

R. 'Richard Montgomery 1956'

Azalea Hybrid

R. 'Rosette' X R. 'Mania'

Hybridized By: Clagett, W.L. (Buck) | USA | Derwood, Maryland, 1991

R. 'Richard Strauss'

Rhododendron Hybrid

? X ?

Hybridized By: Koster M. & Sons. Boskoop, Netherlands, 1958

R. 'Richardii'

Azalea Hybrid

? X ?

Hybridized By: Verschaffelt, A. (Alexander) | Ghent | Belgium, 1851

R. 'Richardissimum'

Azalea Hybrid

? X ?

Hybridized By: Sunningdale Nursery, 1898

R. 'Richie'

Azalea Hybrid

? X ?

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

R. 'Rickshaw'

Rhododendron Hybrid

? X ?

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

R. 'Rickshaw Group'

Rhododendron Cultivar group

? X ?

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

R. 'Ridgewood Salmon'

Rhododendron Hybrid

? X ?

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

R. 'Rigense'

Azalea Hybrid

? X ?

Hybridized By: Kondratovičs, Rihard | Riga | Latvia, 1999

R. 'Rigging Slinger'

Rhododendron Hybrid

R. 'Virginia Scott x Alice Franklin' X R. degronianum ssp yakushimanum

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

R. rigidum

Species

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Triflora

R. rigidum 'Album'

Rhododendron Species Selection

Selected By: UK, No hybridizer registered, 1988

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Triflora

R. rigidum 'Louvecienne'

Rhododendron Species Selection

Selected By: Unknown

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Triflora

R. 'Rik'

Rhododendron Hybrid

? X ?

Hybridized By: Yavorsky, L.. Freehold, New Jersey, USA

R. 'Rim Fire'

Azalea Hybrid

R. 'Louise Gable x Ward's Ruby' X R. 'James Gable'

Hybridized By: Guttormsen, W.L. | Greenwood Gardens, Canby, Oregon | USA, 1968

R. 'Rimini'

Rhododendron Hybrid

R. dichroanthum ssp apodectum X R. fortunei ssp discolor

Hybridized By: Rothschild, L. de. Founder of Exbury Gardens, UK, 1930

R. 'Rimpo'

Azalea Hybrid

? X ?

Hybridized By: Wada, K. | Hakonea Nursery, Numazu | Japan

R. 'Rimshot'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Rinaldo'

Rhododendron Hybrid

R. 'Mrs Milner' X R. smirnowii

Hybridized By: Seidel, T.J.R.. Dresden/Grüngräbchen, Germany, 1915

R. 'Ring of Fire'

Rhododendron Hybrid

R. 'Darigold' X R. 'Idealist'

Hybridized By: Thompson’s Nursery. Waldport, Oregon, USA, 1970

R. 'Ring of Fire x Lem's Cameo'

Rhododendron Hybrid

R. 'Ring of Fire' X R. 'Lem's Cameo'

Hybridized By: No hybridiser registered

R. 'Ring One'

Azalea Hybrid

? X ?

Hybridized By: Ring, G.W.

R. 'Ring's Early Splendor'

Rhododendron Hybrid

R. hyperythrum X R. catawbiense 'Catalgla'

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1979

R. 'Ring's Monarch'

Rhododendron Hybrid

R. 'Graf Zeppelin' X R. 'Newburyport Belle'

Hybridized By: Ring, T.L.. Bellaire, Ohio, USA, 1985

R. 'Ring's Orchido'

Azalea Hybrid

? X ?

Hybridized By: Ring, G.W.

R. 'Ringetsu'

Azalea Hybrid

? X ?

Hybridized By: No hybridiser registered, 1987