Rhododendron Index

R. 'Ringetsu'

Evergreen Azalea Hybrid

? x ?

R. 'Ringgold'

Deciduous Azalea Hybrid

? x ?

Hybridized By: Gable, J.B.

R. 'Rio'

Rhododendron Hybrid

R. 'Newburyport Beauty' x R. 'Newburyport Belle'

Hybridized By: Leach, Dr. David G.

R. 'Rio de Janeiro'

Rhododendron Hybrid

? x ?

Hybridized By: Guyens, H.J.A.

R. 'Rio Rita'

Vireya Hybrid

R. 'Doctor Hermann Sleumer' x R. leucogigas

Hybridized By: Blumhardt, O. S.

R. 'Ripe Corn'

Rhododendron Hybrid

R. 'Goldsworth Orange' x R. 'Exbury Naomi'

Hybridized By: Slocock, Walter C.

R. 'Ripe Peach'

Rhododendron Hybrid

R. 'C.O.D.' x R. 'Dexter's Honeydew'

Hybridized By: Knippenberg, Mrs. J. F.

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R. 'Riplet Group'

Rhododendron Hybrid

R. forrestii Repens Group x R. 'Letty Edwards Group'

Hybridized By: Lem Halfdan

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R. ripleyi var basitrichum

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. ripleyi var cryptogonium

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. ripleyi var ripleyi

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. ririei

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Argyrophylla

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R. 'Rising Sun'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Morrison, B.Y.

R. 'Risque'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Morrison, B.Y.

R. 'Rita Zvaigzne'

Deciduous Azalea Hybrid

? x ?

Hybridized By: Kondratovičs, Rihard

R. 'Ritchard's Red'

Rhododendron Hybrid

? x ?

Hybridized By: Delp Weldon E.

R. 'Ritchie'

Rhododendron Hybrid

R. catawbiense 'Catalgla' x R. 'Sappho'

Hybridized By: Delp Weldon E.

R. 'Ritchutissima'

Azalea Hybrid

? x ?

Hybridized By: Sunningdale Nursery

R. 'Ritenďtis'

Azalea Hybrid

? x ?

Hybridized By: Kondratovičs, Rihard

R. 'Ritzy'

Rhododendron Hybrid

? x ?

Hybridized By: Smith, A.L.

R. 'Rival'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Pericat, A.

R. 'Rivermist'

Evergreen Azalea Hybrid

R. 'Sherwoodii' x R. 'Fedora'

Hybridized By: Harris, J.O.

R. rivulare

Species

Subgenus: Tsutsusi
Section: Tsutsusi

R. 'Rixte'

Rhododendron Hybrid

R. 'Goldsworth Orange' x R. insigne

Hybridized By: Robeneck, H.

R. 'Road Red'

Rhododendron Hybrid

? x ?

Hybridized By: Steele, Captain Richard, M.

R. 'Roadrunner'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Motzkau, H.W.

R. 'Rob's Favourite'

Vireya Hybrid

R. viriosum x R. macgregoriae

R. 'Robbie Robinson'

Rhododendron Hybrid

? x ?

R. 'Robbins Flame'

Deciduous Azalea Hybrid

? x ?

Hybridized By: Arneson, Ivan & Robertha

R. 'Robbo'

Rhododendron Hybrid

? x ?

Hybridized By: Stockman, M.

R. 'Robby'

Rhododendron Hybrid

? x ?

Hybridized By: Delp Weldon E.

R. 'Robert Allison'

Rhododendron Hybrid

R. 'Caroline' x R. fortunei ssp discolor

Hybridized By: Gable, J.B.

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R. 'Robert Balch'

Rhododendron Hybrid

R. arboreum ssp zeylanicum x R. elliottii

Hybridized By: Balch, R.W.

R. 'Robert Bates'

Vireya Hybrid

(R. zoelleri x viriosum) x R. konori var konori

R. 'Robert Burns'

Rhododendron Hybrid

? x ?

Hybridized By: Noble, C.

R. 'Robert Cobden'

Rhododendron Hybrid

? x ?

Hybridized By: Davies, I

R. 'Robert Coe'

Rhododendron Hybrid

? x ?

Hybridized By: Dexter, C.O.

R. 'Robert Croux'

Rhododendron Hybrid

? x ?

Hybridized By: Croux & Fils

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R. 'Robert de Belder'

Rhododendron Hybrid

? x ?

Hybridized By: Böhlje G. D.

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R. 'Robert de Schrijver'

Evergreen Azalea Hybrid

? x ?

R. 'Robert Earl'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Greentree, M.E.

R. 'Robert Fortune'

Rhododendron Cultivar group

R. griffithianum x R. 'H. M. Arderne'

Hybridized By: Williams, Percival D.

R. 'Robert Hale'

Rhododendron Hybrid

? x ?

Hybridized By: Sifferman, Karl I.

R. 'Robert Keir'

Rhododendron Hybrid

R. lacteum x R. 'Luscombei'

Hybridized By: Stevenson, J.B.

R. 'Robert Koch'

Deciduous Azalea Hybrid

R. 'Cecile' x R. Gibraltar

Hybridized By: Fleischmann, C.

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R. 'Robert Korn'

Rhododendron Hybrid

R. 'Diane' x R. 'Gomer Waterer'

Hybridized By: Korn, R.

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R. 'Robert Louis Stevenson'

Rhododendron Hybrid

R. 'May Day Group' x R. 'Jester'

Hybridized By: Seabrook, Cecil S.

R. 'Robert Schill'

Rhododendron Hybrid

R. 'Whitney’s Orange' x R. 'Golden Star'

Hybridized By: Rosenthal, J.

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R. 'Robert Seleger'

Rhododendron Hybrid

R. calostrotum ssp keleticum x ?

Hybridized By: Hobbie, Dietrich G.

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R. 'Robert Sutherland'

Rhododendron Hybrid

R. 'R.O. Delp' x R. 'Golden Star x Mezitt's Hardy Yellow'

Hybridized By: Looye, Jack

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