Rhododendron Index

R. 'Sidestep'

Rhododendron Hybrid

? x ?

Hybridized By: Weston Nurseries

R. 'Sidney Herbert'

Rhododendron Hybrid

? x ?

Hybridized By: Waterer (Bagshot)

R. 'Sidonia'

Evergreen Azalea Hybrid

? x ?

Hybridized By: van Geert, C.

R. 'Sidonia Group'

Rhododendron Cultivar group

R. 'Rose Perfection' x R. fortunei ssp fortunei

Hybridized By: Aberconway, Lord

R. 'Siegetsu'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Japan

R. 'Siegfried'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Schulz, O. (head-gardener, Royal Porcelain Factory)

R. 'Sierra Beauty'

Rhododendron Hybrid

? x ?

Hybridized By: Lofthouse, J.G.

R. 'Sierra del Oro'

Rhododendron Hybrid

R. 'Crest' x R. lacteum

Hybridized By: Lofthouse, J.G.

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R. 'Sierra Glow'

Evergreen Azalea Hybrid

? x R. 'Hahn's Red'

Hybridized By: Yavorsky, L.

R. 'Sierra Nevada'

Evergreen Azalea Hybrid

? x ?

Hybridized By: ISRIA

R. 'Sierra Snow'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Roehrs, J.

R. 'Sierra Stars'

Rhododendron Hybrid

? x ?

Hybridized By: Lofthouse, J.G.

R. 'Sierra Sunrise'

Rhododendron Hybrid

R. 'Mrs Horace Fogg' x R. 'Point Defiance'

Hybridized By: Lofthouse, J.G.

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R. 'Sierra Sunset'

Rhododendron Hybrid

R. 'Sunup-Sundown' x R. 'Lem's Cameo'

Hybridized By: Lofthouse, J.G.

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R. 'Sierra Treasure'

Rhododendron Hybrid

R. 'Crest' x R. lacteum

Hybridized By: Lofthouse, J.G.

R. 'Siesta'

Rhododendron Hybrid

R. 'Britannia' x R. degronianum ssp yakushimanum

Hybridized By: Elliott, James A.

R. sigillatum

Species

Section: Tsutsusi

R. 'Sigismond Rucker'

Evergreen Azalea Hybrid

R. 'Rachel von Varenhagen' x ?

Hybridized By: Van Houtte, L. B. (Louis Benoit)

R. 'Sigismund Rucker'

Rhododendron Hybrid

? x ?

Hybridized By: Waterer, H. (Knaphill)

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R. 'Sigmund Romberg'

Rhododendron Hybrid

? x ?

Hybridized By: Seabrook, Cecil S.

R. 'Signal'

Rhododendron Hybrid

? x ?

Hybridized By: Lancaster, Ben, F.

R. 'Signal'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Morrison, B.Y.

R. 'Signal Horn'

Rhododendron Hybrid

R. 'Atrosanguineum' x R. 'Goldsworth Yellow'

Hybridized By: Nearing, G.G.

R. 'Signal Light'

Deciduous Azalea Hybrid

? x ?

Hybridized By: Frisbie, L.F.

R. 'Signalfeuer'

Rhododendron Hybrid

? x ?

R. 'Signalglühen'

Evergreen Azalea Hybrid

? x ?

R. 'Signor Lablanche'

Rhododendron Hybrid

? x ?

Hybridized By: Noble, C.

R. 'Signorina'

Rhododendron Hybrid

R. 'Kalamaika' x R. 'Perlina'

Hybridized By: Hachmann, Hans

R. 'Sigrid'

Rhododendron Hybrid

? x ?

Hybridized By: Laxdall, S. Mrs

R. 'Siho'

Evergreen Azalea Hybrid

? x ?

Hybridized By: Japan

R. sikangense var exquisitum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Maculifera

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R. sikangense var sikangense

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Maculifera

R. sikayotaisanense

Species

Subgenus: Tsutsusi
Section: Tsutsusi

R. sikidera

Natural Hybrid

R. indicum x R. kaempferi

R. sikkimense

Natural Hybrid

R. thomsonii ssp thomsonii x R. arboreum ssp arboreum

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R. 'Silberfee'

Rhododendron Hybrid

R. 'Mrs Lindsay Smith' x R. degronianum ssp yakushimanum 'Hanano-ego'

Hybridized By: Robeneck, H.

R. 'Silberglanz'

Rhododendron Hybrid

R. 'Humboldt' x R. degronianum ssp yakushimanum 'Koichiro Wada'

Hybridized By: Hachmann, Hans

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R. 'Silbermond'

Rhododendron Hybrid

? x ?

Hybridized By: Hesse, H.

R. 'Silberreif'

Rhododendron Hybrid

? x ?

R. 'Silbervelours'

Rhododendron Hybrid

R. degronianum ssp yakushimanum 'Koichiro Wada' x R. pachysanthum

Hybridized By: Hachmann, Hans

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R. 'Silberwolke'

Rhododendron Hybrid

R. degronianum ssp yakushimanum 'Koichiro Wada' x R. 'Album Novum'

Hybridized By: Hachmann, Hans

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R. 'Silk Ribbon'

Rhododendron Hybrid

R. 'Anita Dunstan' x R. 'One Thousand Butterflies'

Hybridized By: Barlup, Jim

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R. 'Silk Road'

Rhododendron Hybrid

R. 'brachycarpum ssp tigerstedtii x Phipps Yellow' x R. 'Nelda Peach'

Hybridized By: Anderson A.T. & S.A

R. 'Silkcap'

Rhododendron Hybrid

? x ?

R. 'Silken Shimmer'

Vireya Hybrid

R. konori var konori x R. Doctor Hermann Sleumer

R. 'Siltcoos Sunrise'

Rhododendron Hybrid

R. 'Paprika Spiced' x R. 'Jezebel'

Hybridized By: Cockeram, Eugene

R. 'Silver Anniversary'

Evergreen Azalea Hybrid

R. 'Gretel' x ?

Hybridized By: Taylor, G.

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R. 'Silver Bear'

Rhododendron Hybrid

R. degronianum ssp yakushimanum x R. bureavii

R. 'Silver Cup'

Evergreen Azalea Hybrid

? x ?

R. 'Silver Dane'

Rhododendron Hybrid

R. degronianum ssp yakushimanum x R. pachysanthum

Hybridized By: Hansen, Svend

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