Index

R. 'Sidestep'

Rhododendron Hybrid

? X ?

Hybridized By: Weston Nurseries

R. 'Sidney Herbert'

Rhododendron Hybrid

? X ?

Hybridized By: Waterer (Bagshot). Surrey, England

R. 'Sidonia'

Azalea Hybrid

? X ?

Hybridized By: van Geert, C., 1852

R. 'Sidonia Group'

Rhododendron Cultivar group

R. 'Rose Perfection' X R. fortunei ssp fortunei

Hybridized By: Aberconway, Lord. Bodnant, Tal-y-Cafn, Wales, 1933

R. 'Siegetsu'

Azalea Hybrid

? X ?

Hybridized By: Japan | no hybridiser registration

R. 'Siegfried'

Azalea Hybrid

? X ?

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

R. 'Sierra Beauty'

Rhododendron Hybrid

? X ?

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada

R. 'Sierra del Oro'

Rhododendron Hybrid

R. 'Crest' X R. lacteum

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada, 1967

R. 'Sierra Glow'

Azalea Hybrid

? X R. 'Hahn's Red'

Hybridized By: Yavorsky, L. | Freehold, New Jersey | USA, 1978

R. 'Sierra Nevada'

Azalea Hybrid

? X ?

Hybridized By: ISRIA

R. 'Sierra Snow'

Azalea Hybrid

? X ?

Hybridized By: Roehrs, J.

R. 'Sierra Stars'

Rhododendron Hybrid

? X ?

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada

R. 'Sierra Sunrise'

Rhododendron Hybrid

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

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada, 1975

R. 'Sierra Sunset'

Rhododendron Hybrid

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

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada, 1979

R. 'Sierra Treasure'

Rhododendron Hybrid

R. 'Crest' X R. lacteum

Hybridized By: Lofthouse, J.G.. Vancouver, British Columbia, Canada, 1967

R. 'Siesta'

Rhododendron Hybrid

R. 'Britannia' X R. degronianum ssp yakushimanum

Hybridized By: Elliott, James A.. Astoria, Oregon, USA

R. sigillatum

Species

Section: Tsutsusi

R. 'Sigismond Rucker'

Azalea Hybrid

R. 'Rachel von Varenhagen' X ?

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

R. 'Sigismund Rucker'

Rhododendron Hybrid

? X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK, 1980

R. 'Sigmund Romberg'

Rhododendron Hybrid

? X ?

Hybridized By: Seabrook, Cecil S.. Tacoma, Washington, USA

R. 'Signal'

Rhododendron Hybrid

? X ?

Hybridized By: Lancaster, Ben, F.. Lackamas Gardens, Camas, Washington, USA

R. 'Signal'

Azalea Hybrid

? X ?

Hybridized By: Morrison, B.Y. | Pass Christian, Mississippi | USA

R. 'Signal Horn'

Rhododendron Hybrid

R. 'Atrosanguineum' X R. 'Goldsworth Yellow'

Hybridized By: Nearing, G.G.. Ramsey, NJ, USA, 1962

R. 'Signal Light'

Azalea Hybrid

? X ?

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

R. 'Signalfeuer'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Signalglühen'

Azalea Hybrid

? X ?

Hybridized By: Unknown

R. 'Signor Lablanche'

Rhododendron Hybrid

? X ?

Hybridized By: Noble, C.. Standish & Noble, Bagshot, Surrey, England, 1862

R. 'Signorina'

Rhododendron Hybrid

R. 'Kalamaika' X R. 'Perlina'

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1987

R. 'Sigrid'

Rhododendron Hybrid

? X ?

Hybridized By: Laxdall, S. Mrs

R. 'Siho'

Azalea Hybrid

? X ?

Hybridized By: Japan | no hybridiser registration

R. sikangense var exquisitum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Maculifera

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

Subgenus: Hymenanthes
Section: Pontica
Subsection: Thomsonia

R. 'Silberfee'

Rhododendron Hybrid

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

Hybridized By: Robeneck, H.. Westerstede, Germany, 1975

R. 'Silberglanz'

Rhododendron Hybrid

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

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1968

R. 'Silbermond'

Rhododendron Hybrid

? X ?

Hybridized By: Hesse, H., 1998

R. 'Silberreif'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Silbervelours'

Rhododendron Hybrid

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

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1988

R. 'Silberwolke'

Rhododendron Hybrid

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

Hybridized By: Hachmann, Hans. Barmstedt in Holstein, Germany, 1963

R. 'Silk Ribbon'

Rhododendron Hybrid

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

Hybridized By: Barlup, Jim. Bellevue, USA, 1985

R. 'Silk Road'

Rhododendron Hybrid

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

Hybridized By: Anderson A.T. & S.A, 1997

R. 'Silkcap'

Rhododendron Hybrid

? X ?

Hybridized By: Unknown

R. 'Silken Shimmer'

Vireya Hybrid

R. konori var konori X

Hybridized By: Unknown

R. 'Siltcoos Sunrise'

Rhododendron Hybrid

R. 'Paprika Spiced' X R. 'Jezebel'

Hybridized By: Cockeram, Eugene, 1995

R. 'Silver Anniversary'

Azalea Hybrid

R. 'Gretel' X ?

Hybridized By: Taylor, G., 1965

R. 'Silver Bear'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. bureavii

Hybridized By: Unknown

R. 'Silver Cup'

Azalea Hybrid

? X ?

Hybridized By: Unknown

R. 'Silver Dane'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. pachysanthum

Hybridized By: Hansen, Svend. Kernhuset, Denmark

R. 'Silver Dust'

Rhododendron Hybrid

R. 'Golfer' X R. 'Chemainus'

Hybridized By: Fujioka, Frank. Whidbey Island, USA, 2002