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Nummer Naam Genus Cultivar Familie Perk  
00001609 Rhododendron 'Abador Feuerwerk' Rhododendron 'Abador Feuerwerk' Ericaceae 117
00004543 Rhododendron 'Abendrot' (R. 'Essex Scarlet' × R. forrestii) Rhododendron 'Abendrot' Ericaceae 008
00009206 Rhododendron aberconwayi Cowan × R. degronianum Rhododendron Ericaceae 174
20080017 Rhododendron 'Ada Brunières' (Harde Gentse) Rhododendron 'Ada Brunières' Ericaceae 176
20150153 Rhododendron 'Addy Wery' (Japanse azalea) Rhododendron 'Addy Wery' Ericaceae  
00001290 Rhododendron 'Addy Wery' (Japanse azalea) Rhododendron 'Addy Wery' Ericaceae 118  
00009207 Rhododendron adenogynum Diels Rhododendron Ericaceae PKK  
00007915 Rhododendron adenogynum Diels Rhododendron Ericaceae 006
00004108 Rhododendron 'Admiraal de Ruyter' (Harde Gentse) Rhododendron 'Admiraal de Ruyter' Ericaceae 110
00003399 Rhododendron 'Admiral Vanessa' (R. fortunei subsp. discolor × R. 'Marie Stuart') Rhododendron 'Admiral Vanessa' Ericaceae 036  
00001231 Rhododendron 'Admiral Vanessa' (R. fortunei subsp. discolor × R. 'Marie Stuart') Rhododendron 'Admiral Vanessa' Ericaceae 103  
00004438 Rhododendron 'Adonis' (Japanse azalea) Rhododendron 'Adonis' Ericaceae 118  
00001267 Rhododendron 'Adonis' (Japanse azalea) Rhododendron 'Adonis' Ericaceae 118
00005664 Rhododendron 'Adriaan Koster' (R. molle hybrid) Rhododendron 'Adriaan Koster' Ericaceae 108
00007301 Rhododendron 'Advance' (R. occidentale hybrid) Rhododendron 'Advance' Ericaceae 161
20150137 Rhododendron 'Agatha' (Harde Gentse) Rhododendron 'Agatha' (Harde Gentse) Ericaceae  
00007187 Rhododendron 'Ageeth' (Japanse azalea) Rhododendron 'Ageeth' Ericaceae 118  
00005352 Rhododendron 'Aida' (Harde Gentse/Rustica) Rhododendron 'Aida' Ericaceae 034
00006581 Rhododendron 'Aladdin' (R. griersonianum × R. auriculatum) Rhododendron 'Aladdin' Ericaceae 052
00001233 Rhododendron 'Albatross Townhill White' Rhododendron 'Albatross Townhill White' Ericaceae 103  
20120095 Rhododendron 'Albert-Elisabeth' (sport R. 'Haerewille Pink Pearl' × ?) Rhododendron 'Albert-Elizabeth' Ericaceae  
00003371 Rhododendron 'Albert Schweitzer' Rhododendron 'Albert Schweitzer' Ericaceae 036
00003759 Rhododendron albrechtii Maxim. Rhododendron Ericaceae 036
00006251 Rhododendron 'Album Grandiflorum' (Harde Gentse) Rhododendron 'Album Grandiflorum' Ericaceae 155
00004978 Rhododendron 'Album Grandiflorum' (Harde Gentse) Rhododendron 'Album Grandiflorum' Ericaceae 149
20150149 Rhododendron 'Alexandra' (Japanse azalea) ? Rhododendron 'Alexandra' Ericaceae  
00003400 Rhododendron 'Alice' (R. griffithianum hybrid) Rhododendron 'Alice' Ericaceae 036
00009034 Rhododendron 'Alice de Stuers' (R. molle hybrid) Rhododendron 'Alice de Stuers' Ericaceae 175  
00007409 Rhododendron 'Alice Martineau' (R. discolor × R. catawbiense hybrid) Rhododendron 'Alice Martineau' Ericaceae 106  
00001304 Rhododendron 'Allotria' (Japanse azalea) Rhododendron 'Allotria' Ericaceae 118
00003285 Rhododendron 'Aloha' (R. 'Vulcan' × R. yakushimanum) Rhododendron 'Aloha' Ericaceae 117  
00007127 Rhododendron 'Altaclerense' (Harde Gentse) Rhododendron 'Altaclerense' Ericaceae 162
00009089 Rhododendron 'Altaclerense' (Harde Gentse) Rhododendron 'Altaclerense' Ericaceae 174
00001214 Rhododendron ambiguum Hemsl. Rhododendron Ericaceae 128  
20150157 Rhododendron 'Amoena' (Japanse azalea) Rhododendron 'Amoena' Ericaceae  
00001285 Rhododendron 'Amoenum' (Japanse azalea) Rhododendron 'Amoenum' Ericaceae 118  
00001330 Rhododendron 'Andrej' (R. 'Britannia' × R. yakushimanum) Rhododendron 'Andrej' Ericaceae 117
00001087 Rhododendron 'Anilin' (R. 'Sammetglut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Anilin' Ericaceae 121  
00001620 Rhododendron 'Anka Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'America') Rhododendron 'Anka Heinje' Ericaceae 117
00001395 Rhododendron 'Anna Baldsiefen' (R. 'Gable's Pioneer' F2) Rhododendron 'Anna Baldsiefen' Ericaceae 118  
00001133 Rhododendron 'Annabelle' (Knap Hill/Exbury) Rhododendron 'Annabelle' Ericaceae 107
00005385 Rhododendron annae Franch. Rhododendron Ericaceae 035  
00001151 Rhododendron 'Anna H. Hall' (R. catawbiense × R. yakushimanum 'Koichiro Wada') Rhododendron 'Anna H. Hall' Ericaceae 121
00001039 Rhododendron 'Anna H. Hall' (R. catawbiense × R. yakushimanum 'Koichiro Wada') Rhododendron 'Anna H. Hall' Ericaceae 121
00001365 Rhododendron 'Anna Kehr' (Japanse azalea) Rhododendron 'Anna Kehr' Ericaceae 118
00004114 Rhododendron 'Anna-Louise' (Harde Gentse) Rhododendron 'Anna-Louise' Ericaceae 110
00003384 Rhododendron 'Anna Rose Whitney' (R. griersonianum × R. 'Countess of Derby') Rhododendron 'Anna Rose Whitney' Ericaceae 036
00001364 Rhododendron 'Anne Frank' (Japanse azalea) † Rhododendron 'Anne Frank' Ericaceae ---
00004435 Rhododendron 'Anneke' (Japanse azalea) Rhododendron 'Anneke' Ericaceae 118  
00004970 Rhododendron 'Anneke' (Knap Hill/Exbury) Rhododendron 'Anneke' Ericaceae 108
20060001 Rhododendron 'Anne Liese' (Harde Gentse) Rhododendron 'Anne Liese' Ericaceae 176  
00005660 Rhododendron 'Antilope' (Rhododendron viscosum × R. 'Koster's Briliant Red') Rhododendron 'Antilope' Ericaceae 108
00007408 Rhododendron 'Antje' (R. 'Essex Scarlet' × R. forrestii) Rhododendron 'Antje' Ericaceae 008
00003452 Rhododendron 'Anuschka' (R. 'Sammetglut' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Anuschka' Ericaceae ---
00009090 Rhododendron 'Apelles' (Harde Gentse/Rustica) Rhododendron 'Apelles' Ericaceae 174
00004589 Rhododendron 'Apelles' (Harde Gentse/Rustica) Rhododendron 'Apelles' Ericaceae 150
00003511 Rhododendron 'Apfelblüte' (R. wardii hybrid Rhododendron 'Apfelblüte' Ericaceae 139
00004662 Rhododendron 'Apotheose' (Japanse azalea) Rhododendron 'Apotheose' Ericaceae 118  
00005364 Rhododendron 'Apple Blossom' (R. molle hybrid) Rhododendron 'Apple Blossom' Ericaceae 034
00004001 Rhododendron 'April Glow' (R. 'Wilgen's Ruby' × R. williamsianum) Rhododendron 'April Glow' Ericaceae 024  
00003432 Rhododendron 'April Glow' (R. 'Wilgen's Ruby' × R. williamsianum) Rhododendron 'April Glow' Ericaceae 024
00001099 Rhododendron 'Arabella' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Arabella' Ericaceae 121
00003469 Rhododendron 'Arabella' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') † Rhododendron 'Arabella' Ericaceae ---
00003760 Rhododendron arborescens Torr. Rhododendron Ericaceae 036
20150222 Rhododendron arborescens (Pursh) Torr. Rhododendron Ericaceae  
00001367 Rhododendron 'Arctic Tern' (R. trichostomum hybrid) Rhododendron 'Arctic Tern' Ericaceae 135
00004536 Rhododendron 'Ardeur' (Japanse azalea) Rhododendron 'Ardeur' Ericaceae 118
20150138 Rhododendron 'Arethusa' (Harde Gentse) Rhododendron 'Arethusa' Ericaceae  
00001234 Rhododendron 'Argosy' (R. fortunei subsp. discolor × R. auriculatum) Rhododendron 'Argosy' Ericaceae 103  
00007414 Rhododendron argyrophyllum Franch. 'Chinese Silver' Rhododendron 'Chinese Silver' Ericaceae 166
00006641 Rhododendron 'Ariadne' (Harde Gentse/Rustica) Rhododendron 'Ariadne' Ericaceae 163
00006429 Rhododendron 'Ariadne' (Harde Gentse/Rustica) Rhododendron 'Ariadne' Ericaceae 152  
00004581 Rhododendron 'Ariel' (Harde Gentse) Rhododendron 'Ariel' Ericaceae 150
00007411 Rhododendron 'Armantine' (Calomina Group) Rhododendron 'Armantine' Ericaceae 166
00004387 Rhododendron 'Arpège' (R. viscosum hybrid) Rhododendron 'Arpège' Ericaceae 164  
00001199 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001198 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001172 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001200 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001187 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001185 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001186 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001183 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001184 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001182 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001176 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154
00001178 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00005554 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00005555 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001177 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001175 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001181 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00005552 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001180 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001179 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001174 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001173 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001197 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154
00001196 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001192 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001002 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001191 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001190 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001188 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001194 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154
00001195 Rhododendron 'Arthur Bedford' (R. ponticum hybrid) Rhododendron 'Arthur Bedford' Ericaceae 154  
00001678 Rhododendron 'Astrid' (R. yakushimanum 'Fantastica' × R. 'Feuerschein') Rhododendron 'Astrid' Ericaceae 117  
20150220 Rhododendron atlanticum Rehder Rhododendron Ericaceae  
00003761 Rhododendron atlanticum (Ashe) Rehder Rhododendron Ericaceae 036
00009047 Rhododendron atlanticum Rehder 'Choptank River' Rhododendron 'Choptank River' Ericaceae 004  
00007136 Rhododendron 'Atrorubens Novum' (Harde Gentse) Rhododendron 'Atrorubens Novum' Ericaceae 163
00007571 Rhododendron 'Atrorubens Novum' (Harde Gentse) Rhododendron 'Atrorubens Novum' Ericaceae PKK  
00005372 Rhododendron augustinii Hemsl. † Rhododendron Ericaceae ---
00005353 Rhododendron augustinii Hemsl. × R. apenitum Rhododendron Ericaceae 034  
00003361 Rhododendron 'August Lamken' (R. 'Dr. V. H. Rutgers' × R. williamsianum) Rhododendron 'August Lamken' Ericaceae 122
00007363 Rhododendron auriculatum Hemsl. Rhododendron Ericaceae 048  
00007111 Rhododendron auriculatum Hemsl. × R. 'Nymphenburg' Rhododendron Ericaceae 036  
00004274 Rhododendron 'Aurora' (Knap Hill/Exbury) Rhododendron 'Aurora' Ericaceae 148
00006411 Rhododendron 'Aurore de Royghem' (Harde Gentse) Rhododendron 'Aurore de Royghem' Ericaceae 152
00001380 Rhododendron austrinum Rehder † Rhododendron Ericaceae ---  
00001003 Rhododendron 'Autumn Gold' (R. fortunei subsp. discolor × R. Fabia Group) Rhododendron 'Autumn Gold' Ericaceae 108
20120089 Rhododendron 'Autumn Twist' Rhododendron 'Autumn Twist' Ericaceae  
00003377 Rhododendron 'Azor' (R. griersonianum × R. fortunei subsp. discolor) Rhododendron 'Azor' Ericaceae 036  
00001224 Rhododendron 'Azurika' (R. russatum × R. impeditum) Rhododendron 'Azurika' Ericaceae 132  
00005447 Rhododendron 'Azurika' (R. russatum × R. impeditum) † Rhododendron 'Azurika' Ericaceae ---
00004397 Rhododendron 'Azurro' ((R. 'Nova Zembla' × R. 'Purple Splendour') × R. 'Purple Splendour') Rhododendron 'Azurro' Ericaceae 140
00003519 Rhododendron 'Babette' (R. wardii × R. yakushimanum 'Koichiro Wada') Rhododendron 'Babette' Ericaceae 139
00001050 Rhododendron 'Babette' (R. wardii × R. yakushimanum 'Koichiro Wada') Rhododendron 'Babette' Ericaceae 121
00004260 Rhododendron 'Baden-Baden' (R. 'Essex Scarlet' × R. forrestii) Rhododendron 'Baden-Baden' Ericaceae 008
00003372 Rhododendron 'Bagshot Ruby' (R. thomsonii hybrid) Rhododendron 'Bagshot Ruby' Ericaceae 036
00001072 Rhododendron 'Bajazzo' (R. 'Daisy' × R. williamsianum Oldenburg Group) Rhododendron 'Bajazzo' Ericaceae 122
20140029 Rhododendron balangense W.P.Fang Hemsl. Rhododendron Ericaceae 000  
00005607 Rhododendron 'Balzac' (Knap Hill/Exbury) Rhododendron 'Balzac' Ericaceae 108  
00001066 Rhododendron 'Bambi' (R. yakushimanum × R. 'Fabia Tangerine') Rhododendron 'Bambi' Ericaceae 121
00001152 Rhododendron 'Bambi' (R. yakushimanum × R. 'Fabia Tangerine') Rhododendron 'Bambi' Ericaceae 121
20150179 Rhododendron 'Bambi' × R. macabeanum Rhododendron 'Bambi' Ericaceae 121  
00003917 Rhododendron 'Bambola' (R. 'Bad Eilsen' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Bambola' Ericaceae 150  
00007306 Rhododendron 'Barbara Jenkinson' (Knap Hill/Exbury) Rhododendron 'Barbara Jenkinson' Ericaceae 048
00004386 Rhododendron 'Barbecue' (Knap Hill/Exbury) Rhododendron 'Barbecue' Ericaceae 108
00001310 Rhododendron 'Barmstedt' (R. 'Sammetglut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Barmstedt' Ericaceae 121
00003484 Rhododendron 'Barmstedt' (R. 'Sammetglut' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Barmstedt' Ericaceae ---
20060002 Rhododendron 'Baron G. Pycke' (Harde Gentse) Rhododendron 'Baron G. Pycke' Ericaceae 176  
00001129 Rhododendron 'Bartholo Lazzari' (Harde Gentse) Rhododendron 'Bartholo Lazzari' Ericaceae 102
00004125 Rhododendron 'Bartholo Lazzari' (Harde Gentse) Rhododendron 'Bartholo Lazzari' Ericaceae 102
00001081 Rhododendron 'Bashful' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Bashful' Ericaceae 121
00003449 Rhododendron 'Bashful' (R. yakushimanum × R. 'Doncaster') † Rhododendron 'Bashful' Ericaceae ---
00008084 Rhododendron 'Beatrice Keir' (R. 'Logan Damaris' × R. lacteum) † Rhododendron 'Beatrice Keir' Ericaceae ---
00007128 Rhododendron 'Beauté Celeste' (Harde Gentse) Rhododendron 'Beauté Céleste' Ericaceae 163
00004585 Rhododendron 'Beauté de Flandre' (Harde Gentse) Rhododendron 'Beauté de Flandre' Ericaceae 150
00009165 Rhododendron 'Beauté Titanique' (R. yakushimanum hybrid) Rhododendron 'Beauté Titanique' Ericaceae 174  
00003428 Rhododendron 'Bellefontaine' (R. fortunei × R. smirnowii) Rhododendron 'Bellefontaine' Ericaceae 024
00005550 Rhododendron 'Bellefontaine' (R. fortunei × R. smirnowii) Rhododendron 'Bellefontaine' Ericaceae 122
00004576 Rhododendron 'Belle Merveille' (Harde Gentse) Rhododendron 'Belle Merveille' Ericaceae 111
00003513 Rhododendron 'Bellini' (R. 'Omega' × R. wardii) Rhododendron 'Bellini' Ericaceae 139
00005127 Rhododendron 'Bengal' (R. 'Essex Scarlet' × R. forrestii) Rhododendron 'Bengal' Ericaceae 008
00004259 Rhododendron 'Bengal' (R. 'Essex Scarlet' × R. forrestii) Rhododendron 'Bengal' Ericaceae 008
00008083 Rhododendron 'Benjamin' (R. neriiflorum hybrid) Rhododendron 'Benjamin' Ericaceae 004
20120092 Rhododendron 'Benjamin' Rhododendron 'Benjamin' Ericaceae  
00001328 Rhododendron 'Berg's Queen Bee' (R. yakushimanum × R. tsariense) Rhododendron 'Queen Bee' Ericaceae 120
00001004 Rhododendron 'Berliner Liebe' (R. 'El Alamein' × R. insigne) Rhododendron 'Berliner Liebe' Ericaceae 109  
00007413 Rhododendron 'Bernard Crisp' (R. 'Pink Pearl' hybrid) Rhododendron 'Bernard Crisp' Ericaceae 106
00006817 Rhododendron 'Bernstein' (R. 'Goldsworth Orange' × R. 'Mrs. J. G. Millais') Rhododendron 'Bernstein' Ericaceae PKK
00003000 Rhododendron 'Bernstein' (R. 'Goldsworth Orange' × R. 'Mrs. J. G. Millais') Rhododendron 'Bernstein' Ericaceae 036
20080237 Rhododendron 'Bijou de Gentbrugge' (Harde Gentse) Rhododendron 'Bijou de Gentbrugge' Ericaceae 000  
00009092 Rhododendron 'Bijou de Gentbrugge' (Harde Gentse) Rhododendron 'Bijou de Gentbrugge' Ericaceae 174
00004111 Rhododendron 'Bijou des Amateurs' (Harde Gentse) Rhododendron 'Bijou des Amateurs' Ericaceae 110
00005362 Rhododendron Biskra Group 'Biskra' (R. cinnabarinum Roley Group × R. ambiguum) Rhododendron 'Biskra' Ericaceae 034
00003442 Rhododendron 'Blaauw's Pink' (Japanse azalea) Rhododendron 'Blaauw's Pink' Ericaceae 025
00001301 Rhododendron 'Blaauw's Pink' (Japanse azalea) Rhododendron 'Blaauw's Pink' Ericaceae 118  
00009114 Rhododendron 'Blanca' (R. 'Babette' × R. 'Perlina') Rhododendron 'Blanca' Ericaceae 010  
00003446 Rhododendron 'Blaue Donau' (Japanse azalea) Rhododendron 'Blaue Donau' Ericaceae 025  
00001123 Rhododendron 'Blewbury' (R. roxieanum × R. maculiferum subsp. anhweiense) Rhododendron 'Blewbury' Ericaceae 108
00001332 Rhododendron 'Blewbury' (R. roxieanum × R. maculiferum subsp. anhweiense) Rhododendron 'Blewbury' Ericaceae 108  
00004104 Rhododendron 'Blood Red' (Harde Gentse) Rhododendron 'Blood Red' Ericaceae 102
00003548 Rhododendron 'Blue Diamond' (R. Intrifast Group × R. augustinii) † Rhododendron 'Blue Diamond' Ericaceae ---
00004563 Rhododendron 'Blue Diamond' (R. Intrifast Group × R. augustinii) Rhododendron 'Blue Diamond' Ericaceae 108  
00001217 Rhododendron 'Blue Diamond' (R. Intrifast Group × R. augustinii) Rhododendron 'Blue Diamond' Ericaceae 126  
00005575 Rhododendron 'Blue Jay' (R. ponticum × R. 'Blue Insign') Rhododendron blue jay Ericaceae 139
00005576 Rhododendron 'Blue Pacific' (R. 'Purple Splendour' × R. 'Susan') Rhododendron 'Blue Pacific' Ericaceae 139
00003562 Rhododendron 'Blue Peter' (R. ponticum hybrid) Rhododendron 'Blue Peter' Ericaceae 139
00003033 Rhododendron 'Blurettia' (R. 'Blue Peter' × R. yakushimanum) Rhododendron 'Blurettia' Ericaceae 117
00004542 Rhododendron 'Blueshine Girl' (R. Soulkew Group × R. wardii) Rhododendron 'Blueshine Girl' Ericaceae 108
00001605 Rhododendron 'Blue Tit' (R. impeditum × augustinii) Rhododendron 'Blue Tit' Ericaceae 134  
00001220 Rhododendron 'Blue Tit Magor' (R. impeditum × augustinii) Rhododendron 'Blue Tit Magor' Ericaceae 132  
00004557 Rhododendron 'Blue Tit Magor' (R. impeditum × augustinii) Rhododendron 'Blue Tit Magor' Ericaceae 108  
00007255 Rhododendron 'Bluette' (R. impeditum × R. 'Lackamas Blue') Rhododendron 'Bluette' Ericaceae 048  
00003915 Rhododendron 'Bob Bovee' (R. yakushimanum 'Koichiro Wada' × R. wardii) Rhododendron 'Bob Bovee' Ericaceae 150
00005549 Rhododendron 'Boccia' (R. 'Professor F. Bettex' × R. williamsianum) Rhododendron 'Boccia' Ericaceae 122
00001237 Rhododendron 'Bonfire' (R. fortunei subsp. discolor × R. 'Mrs. R.G. Shaw' × R. griersonianum) Rhododendron 'Bonfire' Ericaceae 103
00001006 Rhododendron 'Boule de Neige' (R. caucasicum × R. catawbiense hybrid) Rhododendron 'Boule de Neige' Ericaceae 108
00005665 Rhododendron 'Bouquet de Flore' (Harde Gentse) Rhododendron 'Bouquet de Flore' Ericaceae 117  
00003360 Rhododendron 'Bow Bells' (R. 'Corona' × R. williamsianum) Rhododendron 'Bow Bells' Ericaceae 122
00003289 Rhododendron brachycarpum G.Don subsp. fauriei (Franch.) D.F.Chamb. Rhododendron Ericaceae 108  
00007305 Rhododendron 'Bridesmaid' (R. occidentale hybrid) Rhododendron 'Bridesmaid' Ericaceae 161
00006648 Rhododendron 'Bright Forecast' (Knap Hill/Exbury) † Rhododendron 'Bright Forecast' Ericaceae ---
00001323 Rhododendron 'Brilliant Crimson' (Japanse azalea) Rhododendron 'Brilliant Crimson' Ericaceae 118
00003392 Rhododendron 'Britannia' (R. 'Queen Wilhelmina' × R. 'Stanley Davies') Rhododendron 'Britannia' Ericaceae 036
00001372 Rhododendron 'Brocade' (R. 'Vervaeneanum' × R. williamsianum) Rhododendron 'Brocade' Ericaceae 122
00001371 Rhododendron 'Brocade' (R. 'Vervaeneanum' × R. williamsianum) Rhododendron 'Brocade' Ericaceae 122  
00001370 Rhododendron 'Brocade' (R. 'Vervaeneanum' × R. williamsianum) Rhododendron 'Brocade' Ericaceae 122  
00004975 Rhododendron 'Bronze Unique' (Harde Gentse) Rhododendron 'Bronze Unique' Ericaceae 149
00004264 Rhododendron 'Bruce Brechtbill' (R. 'Unique' Sport) Rhododendron 'Bruce Brechtbill' Ericaceae 108
00009111 Rhododendron 'Bruce Brechtbill' (R. 'Unique' Sport) Rhododendron 'Bruce Brechtbill' Ericaceae 015
00004389 Rhododendron bureavii hybr. Rhododendron Ericaceae 040
00001352 Rhododendron bureavioides Balf.f. † Rhododendron Ericaceae ---
00007439 Rhododendron 'Buttercup' (Knap Hill/Exbury) Rhododendron 'Buttercup' Ericaceae 166
00009018 Rhododendron 'Buzzard' (Knap Hill/Exbury) Rhododendron 'Buzzard' Ericaceae 035
00006413 Rhododendron 'Byron' (Harde Gentse/Rustica) Rhododendron 'Byron' Ericaceae 152
20150225 Rhododendron calendulaceum (Michx.) Torr. Rhododendron Ericaceae  
20140031 Rhododendron calendulaceum (Michx.) Torr. Rhododendron Ericaceae  
00003762 Rhododendron calendulaceum (Michx.) Torr. Rhododendron Ericaceae 036  
20150221 Rhododendron calendulaceum (Michx.) Torr. Rhododendron Ericaceae  
20080120 Rhododendron calendulaceum (Michx.) Torr. Rhododendron Ericaceae 174  
00009137 Rhododendron calendulaceum (Michx.) Torr. × R. arborescens Rhododendron Ericaceae 004  
00007358 Rhododendron calendulaceum (Michx.) Torr. × R. arborescens Rhododendron Ericaceae 036  
00006582 Rhododendron 'Calfort' (R. calophytum × R. fortunei) Rhododendron 'Calfort' Ericaceae 054
00005680 Rhododendron calostrotum Balf.f. & Kingdom-Ward Rhododendron Ericaceae 036  
00001225 Rhododendron calostrotum Balf.f. & Kingdom-Ward subsp. keleticum (Balf.f. & Forrest) Cullen Rhododendron Ericaceae 125
00001611 Rhododendron calostrotum Balf.f. & Kingdom-Ward subsp. keleticum (Balf.f. & Forrest) Cullen Rhododendron Ericaceae 125
00001638 Rhododendron calostrotum Balf.f. & Kingdom-Ward subsp. keleticum (Balf.f. & Forrest) Cullen Rhododendron Ericaceae 127  
00003283 Rhododendron campanulatum D.Don subsp. aeruginosum (Hook.) D.F.Chamb. Rhododendron Ericaceae 040  
00004399 Rhododendron campylocarpum Hook. f. 'Magor' Rhododendron 'Magor' Ericaceae 108
00006640 Rhododendron 'Cannon's Double' (Knap Hill/Exbury) Rhododendron 'Cannon's Double' Ericaceae 048
00001305 Rhododendron 'Canzonetta' (Japanse azalea) Rhododendron 'Canzonetta' Ericaceae 118
20120093 Rhododendron 'Caprice' Rhododendron 'Caprice' Ericaceae  
00005666 Rhododendron 'Carat' (R. viscosum hybrid) Rhododendron 'Carat' Ericaceae 108
00006412 Rhododendron 'Cardinal' (Harde Gentse) Rhododendron 'Cardinal' Ericaceae 155
00001104 Rhododendron 'Carmen' (R. sanguineum subsp. didymum × R. forrestii Repens Group) Rhododendron 'Carmen' Ericaceae 121
00001327 Rhododendron Caroline Spencer Group (R. fortunei × R. williamsianum) Rhododendron Ericaceae 122
00003003 Rhododendron 'Catharine van Tol' (R. catawbiense hybrid) Rhododendron 'Catharine van Tol' Ericaceae 036  
00003382 Rhododendron 'Catharine van Tol' (R. catawbiense hybrid) Rhododendron 'Catharine van Tol' Ericaceae 036
20120090 Rhododendron 'Cattleya' Rhododendron 'Cattleya' Ericaceae  
00003391 Rhododendron caucasicum Pall. 'Pictum' Rhododendron 'Pictum' Ericaceae 036  
00004135 Rhododendron 'Cecile' (Knap Hill/Exbury) † Rhododendron 'Cecile' Ericaceae ---
00001145 Rhododendron 'Cecile' (Knap Hill/Exbury) Rhododendron 'Cecile' Ericaceae 119
00001158 Rhododendron 'Cecile' (Knap Hill/Exbury) † Rhododendron 'Cecile' Ericaceae ---
00006611 Rhododendron 'Cetewayo' (R. ponticum hybrid × R. ponticum hybrid) Rhododendron 'Cetewayo' Ericaceae 048  
00001142 Rhododendron 'Chanel' (R. viscosum hybrid) Rhododendron 'Chanel' Ericaceae 119
00003725 Rhododendron 'Charlemagne' (Harde Gentse) Rhododendron 'Charlemagne' Ericaceae 174
00004587 Rhododendron 'Charles Rogiers' (Harde Gentse) Rhododendron 'Charles Rogiers' Ericaceae 150
00003004 Rhododendron 'Cheer' (R. 'Cunningham's White' × red R. catawbiense hybrid) Rhododendron 'Cheer' Ericaceae 036
00004594 Rhododendron 'Chelsea Reach' (Knap Hill/Exbury) Rhododendron 'Chelsea Reach' Ericaceae 108
00007307 Rhododendron 'Chelsea Reach' (Knap Hill/Exbury) Rhododendron 'Chelsea Reach' Ericaceae 107
00001390 Rhododendron 'Chelsea Seventy' (R. yakushimanum × ((R. 'Jalisco Eclipse' × R. Fusilier Group)) Rhododendron 'Chelsea Seventy' Ericaceae 153  
00003496 Rhododendron 'Chelsea Seventy' (R. yakushimanum × ((R. 'Jalisco Eclipse' × R. Fusilier Group)) † Rhododendron 'Chelsea Seventy' Ericaceae ---
00006644 Rhododendron 'Chevalier A. de Reali' (R. molle hybrid) Rhododendron 'Chevalier A. de Reali' Ericaceae 048
00001637 Rhododendron 'Chiffchaff' (R. hanceanum Nanum Group × R. fletcherianum) Rhododendron 'Chiffchaff' Ericaceae 134  
00006649 Rhododendron 'China' (R. wightii × R. fortunei) † Rhododendron 'China' Ericaceae ---
00001008 Rhododendron 'China' (R. wightii × R. fortunei) Rhododendron 'China' Ericaceae 108  
00001295 Rhododendron 'Chippewa' (Japanse azalea) Rhododendron 'Chippewa' Ericaceae 118
00007440 Rhododendron 'Chocolate Ice' (Knap Hill/Exbury) Rhododendron 'Chocolate Ice' Ericaceae 166
00003005 Rhododendron 'Christmas Cheer' (R. caucasicum hybrid) Rhododendron 'Christmas Cheer' Ericaceae 036
00003385 Rhododendron 'Christmas Cheer' (R. caucasicum hybrid) Rhododendron 'Christmas Cheer' Ericaceae 036
00006635 Rhododendron 'Christopher Wren' (R. molle hybrid) Rhododendron 'Christopher Wren' Ericaceae 048
00006426 Rhododendron 'Chromatella' (Harde Gentse) Rhododendron 'Chromatella' Ericaceae 152
00007314 Rhododendron ×cilpinense hort. (R. moupinense × R. cilatum) Rhododendron Ericaceae 161  
00001626 Rhododendron 'Clivia' (R. 'Manderley' × R. yakushimanum) Rhododendron 'Clivia' Ericaceae 117
00001621 Rhododendron 'Clivia' (R. 'Manderley' × R. yakushimanum) Rhododendron 'Clivia' Ericaceae 117  
00003488 Rhododendron 'Clivia' (R. 'Manderley' × R. yakushimanum) † Rhododendron 'Clivia' Ericaceae ---
00004116 Rhododendron 'Clotilde' (Harde Gentse) Rhododendron 'Clotilde' Ericaceae 110
00007129 Rhododendron 'Coccineum Grandiflorum' (Harde Gentse) Rhododendron 'Coccineum Grandiflorum' Ericaceae 163
00007130 Rhododendron 'Coccineum Major' (Harde Gentse) Rhododendron 'Coccineum Major' Ericaceae 162
00004120 Rhododendron 'Coccineum Speciosum' (Harde Gentse) Rhododendron 'Coccineum Speciosum' Ericaceae 102
00001108 Rhododendron 'Colibri' (R. 'Louis Pasteur' × R. yakushimanum) Rhododendron 'Colibri' Ericaceae 121
00007441 Rhododendron 'Colin Kenrick' (Knap Hill/Exbury) Rhododendron 'Colin Kenrick' Ericaceae 140  
20060003 Rhododendron 'Comte de Flandre' (Harde Gentse) Rhododendron 'Comte de Flandre' Ericaceae 176  
00004974 Rhododendron 'Comte d'Egmont' (Harde Gentse) Rhododendron 'Comte d'Egmont' Ericaceae 149
00004000 Rhododendron 'Comte du Parc' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Comte du Parc' Ericaceae 036  
00001051 Rhododendron 'Comte du Parc' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Comte du Parc' Ericaceae 121
00008085 Rhododendron 'Connecticut Yankee' (R. catawbiense hybrid) Rhododendron 'Connecticut Yankee' Ericaceae 004  
00004661 Rhododendron 'Conny' (Japanse azalea) Rhododendron 'Conny' Ericaceae 118
00008025 Rhododendron 'Cordula' (R. 'Thunderstorm' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Cordula' Ericaceae 150
00001160 Rhododendron 'Corneille' (Harde Gentse/Rustica) Rhododendron 'Corneille' Ericaceae 119
00001161 Rhododendron 'Corneille' (Harde Gentse/Rustica) Rhododendron 'Corneille' Ericaceae 119
00001146 Rhododendron 'Corneille' (Harde Gentse/Rustica) Rhododendron 'Corneille' Ericaceae 119
00004122 Rhododendron 'Corneille' (Harde Gentse/Rustica) Rhododendron 'Corneille' Ericaceae 102
00007415 Rhododendron 'Corry Koster' Rhododendron 'Corry Koster' Ericaceae 106
00009044 Rhododendron 'Coryn' (R. viscosum hybrid) Rhododendron 'Coryn' Ericaceae 164  
00003006 Rhododendron 'Cosmopolitan' (R. 'Cunningham's White' × R. 'Vesuvius') Rhododendron 'Cosmopolitan' Ericaceae 036
00003387 Rhododendron 'Countess of Athlone' (R. 'Geoffrey Millais' × R. catawbiense 'Grandiflorum') Rhododendron 'Countess of Athlone' Ericaceae 036
00003441 Rhododendron 'Cowslip' (R. williamsianum × R. wardii) Rhododendron 'Cowslip' Ericaceae 024  
00005085 Rhododendron 'Crater Lake' (R. augustinii 'Barto Blue' × R. 'Bluebird') Rhododendron 'Crater Lake' Ericaceae 005
00009167 Rhododendron 'Cream Crest' (R. rupicola var. chryseum × R. Cilpinense Group) Rhododendron 'Cream Crest' Ericaceae 050  
00008026 Rhododendron 'Crete' (R. smirnowii × R. yakushimanum) Rhododendron 'Crete' Ericaceae 150  
20150135 Rhododendron 'Crimson King' (Harde Gentse) Rhododendron 'Crimson King' Ericaceae  
00007131 Rhododendron 'Cultivar' (Harde Gentse) Rhododendron 'Cultivar' Ericaceae 162
20080018 Rhododendron 'Croceum Tricolor' (Harde Gentse) Rhododendron 'Croceum Tricolor' Ericaceae 176  
20080019 Rhododendron cfr. 'Croceum Tricolor' (Harde Gentse) Rhododendron 'Croceum Tricolor' Ericaceae 176  
20080269 Rhododendron 'Csárdás' (Knap Hill (R. 'Benedict' × R. 'Posaune')) Rhododendron 'Csárdás' Ericaceae 000  
00005392 Rhododendron cumberladense E.L.Braun Rhododendron Ericaceae 036
00009048 Rhododendron cumberladense E.L.Braun 'Camp's Red' Rhododendron 'Camp's Red' Ericaceae 004  
00007359 Rhododendron cumberladense E.L.Braun hybr. Rhododendron Ericaceae 036  
00003287 Rhododendron 'Cunningham's Blush' Rhododendron 'Cunningham's Blush' Ericaceae 108  
00005221 Rhododendron 'Cunningham's White' (R. caucasicum × R. ponticum 'Album') Rhododendron 'Cunningham's White' Ericaceae 015  
00003918 Rhododendron 'Cupcake' (R. yakushimanum × R. Medusa Group) Rhododendron 'Cupcake' Ericaceae 149  
00007132 Rhododendron 'Cupreum Ardens' (Harde Gentse) Rhododendron 'Cupreum Ardens' Ericaceae 162
00003727 Rhododendron 'Cupreum Aurantium' (Harde Gentse) Rhododendron 'Cupreum Aurantium' Ericaceae 105
00003728 Rhododendron 'Cupreum Pulchellum' (Harde Gentse) Rhododendron 'Cupreum Pulchellum' Ericaceae 105
00007133 Rhododendron 'Cupreum Splendens' (Harde Gentse) Rhododendron 'Cupreum Splendens' Ericaceae 163
00007134 Rhododendron 'Cymodocee' (Harde Gentse) Rhododendron 'Cymodocee' Ericaceae 162
00003366 Rhododendron 'Cynthia' (R. catawbiense × R. griffithianum) Rhododendron 'Cynthia' Ericaceae 036
00009042 Rhododendron 'Dainty' (R. occidentale hybrid) Rhododendron 'Dainty' Ericaceae 160
00007416 Rhododendron 'Daisy' (R. 'Mrs. Milner' × R. smirnowii) Rhododendron 'Daisy' Ericaceae 106
00001041 Rhododendron 'Daniela' (R. 'Samtkrone I' × (R. 'Mars' × R. 'Koichiro Wada')) Rhododendron 'Daniela' Ericaceae 121  
00001798 Rhododendron dauricum L. † Rhododendron Ericaceae ---  
20060084 Rhododendron dauricum L. subsp. sichotense (Pojark) M.S. Alexandr. & P. Schmidt ex Vorosch. Rhododendron Ericaceae PKK  
00007417 Rhododendron 'David' (R. 'Hugh Koster' × R. neriiflorum) Rhododendron 'David' Ericaceae 106
00005088 Rhododendron davidsonianum Rehder & E.H.Wilson 'Lucky Hit' Rhododendron 'Lucky Hit' Ericaceae 005
00003729 Rhododendron 'Daviesii' (Harde Gentse) Rhododendron 'Daviesii' Ericaceae 105
00005356 Rhododendron 'Daviesii' (Harde Gentse) Rhododendron 'Daviesii' Ericaceae 034
00005669 Rhododendron 'Daybreak' (Knap Hill/Exbury) Rhododendron 'Daybreak' Ericaceae 108
00008107 Rhododendron decorum Franch. Rhododendron Ericaceae 002  
00006584 Rhododendron decorum Franch. Rhododendron Ericaceae 055
00006521 Rhododendron decorum Franch. hybr. Rhododendron Ericaceae 051
00003730 Rhododendron 'Decus Hortorum' (Harde Gentse) Rhododendron 'Decus Hortorum' Ericaceae 105
00007553 Rhododendron 'Degor' (R. degronianum × R. oreodoxa) Rhododendron 'Degor' Ericaceae 165  
00009077 Rhododendron degronianum Carrière subsp. heptamerum (Maxim.) Hara Rhododendron 'Amagi' Ericaceae 175
00007107 Rhododendron degronianum Carrière subsp. heptamerum (Maxim.) Hara Rhododendron Ericaceae 054
00004393 Rhododendron degronianum Carrière subsp. heptamerum (Maxim.) Hara Rhododendron Ericaceae 111  
20150140 Rhododendron 'Delicata Nova' (Harde Gentse) Rhododendron 'Delicata Nova' Ericaceae  
00007304 Rhododendron 'Delicatissimum' (R. occidentale hybrid) Rhododendron 'Delicatissimum' Ericaceae 161  
00006245 Rhododendron 'Delicatum' (Harde Gentse) Rhododendron 'Delicata' Ericaceae 155
00004601 Rhododendron 'Diamant Wit' (Japanse azalea) Rhododendron 'Diamant Wit' Ericaceae 118
00003370 Rhododendron 'Diane Van Herzeele' (R. caucasicum hybrid) Rhododendron 'Diane Van Herzeele' Ericaceae 036
00006586 Rhododendron dichroanthum Diels subsp. scyphocalyx (Balf.f. & Forrest) Cowan Rhododendron Ericaceae 048
00006887 Rhododendron dilatatum Miq. † Rhododendron Ericaceae ---
00006605 Rhododendron 'Diorama' (R. viscosum hybrid) Rhododendron 'Diorama' Ericaceae 164
00005482 Rhododendron 'Directeur Charles Baumann' (Harde Gentse) Rhododendron 'Directeur Charles Baumann' Ericaceae 105
00005656 Rhododendron 'Directeur Moerlands' (R. molle hybrid) † Rhododendron 'Directeur Moerlands' Ericaceae ---
00001619 Rhododendron 'Doc' (R. yakushimanum × R. 'Corona') Rhododendron 'Doc' Ericaceae 117  
00003007 Rhododendron 'Doctor Arnold W. Endtz' (R. 'Pink Pearl' × R. catawbiense hybrid) Rhododendron 'Doctor Arnold W. Endtz' Ericaceae 036  
00004404 Rhododendron 'Doctor De Clercq' (R. 'Nigrescens' × R. 'Loderi' ?) Rhododendron 'Doctor De Clercq' Ericaceae 108
00004130 Rhododendron 'Doctor. M. Oosthoek' (R. molle hybrid) Rhododendron 'Doctor. M. Oosthoek' Ericaceae 107
00007103 Rhododendron 'Dolorosa' (Knap Hill/Exbury) Rhododendron 'Dolorosa' Ericaceae 048  
00004574 Rhododendron 'Domenico Scassi' (Harde Gentse) Rhododendron 'Domenico Scassi' Ericaceae 111
00003919 Rhododendron 'Don Giovanni' (R. yakushimanum × R. 'Mars') Rhododendron 'Don Giovanni' Ericaceae 150  
00001062 Rhododendron 'Dormouse' (R. 'Dawn's Delight' × R. williamsianum) Rhododendron 'Dormouse' Ericaceae 122  
00004383 Rhododendron 'Double Damask' (Knap Hill/Exbury) Rhododendron 'Double Damask' Ericaceae 108
00009091 Rhododendron 'Durante Alle' (Harde Gentse) Rhododendron 'Durante Alle' Ericaceae 174
00009004 Rhododendron 'Dusky Maid' (Knap Hill/Exbury) Rhododendron 'Dusky Maid' Ericaceae 006
00001085 Rhododendron 'Dusty Miller' (R. yakushimanum × hybrid) Rhododendron 'Dusty Miller' Ericaceae 153
00003450 Rhododendron 'Dusty Miller' (R. yakushimanum × hybrid) † Rhododendron 'Dusty Miller' Ericaceae ---
00004262 Rhododendron 'Earl of Donoughmore' (R. griersonianum × (hybrid × Mrs. L. A. Dunneth')) Rhododendron 'Earl of Donoughmore' Ericaceae 036
00007555 Rhododendron 'Earl of Donoughmore' × R. 'Kluis Triumph' Rhododendron 'Earl of Donoughmore' Ericaceae 165
00005810 Rhododendron 'Edeltraud' (R. 'Hachmans's Ornament' × R. 'Furnivall's Daughter') Rhododendron 'Edeltraud' Ericaceae 108  
00003732 Rhododendron 'Edison' (Harde Gentse) Rhododendron 'Edison' Ericaceae 105
00007418 Rhododendron 'Edward Dunn' (R. neriiflorum × R. dichroanthum) × R. fortunei subsp. discolor)) Rhododendron 'Edward Dunn' Ericaceae 106  
00007432 Rhododendron 'Edward S. Rand' (R. catawbiense hybrid) Rhododendron 'Edward S. Rand' Ericaceae 106
00001105 Rhododendron 'Eggert Rohwer' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Eggert Rohwer' Ericaceae 121
00007137 Rhododendron 'Electum' (Harde Gentse) Rhododendron 'Electum' Ericaceae 162
00001320 Rhododendron 'Elfenbein' (R. 'Adriaan Koster' × R. williamsianum) Rhododendron 'Elfenbein' Ericaceae 122
00003404 Rhododendron 'Elfenbein' (R. 'Adriaan Koster' × R. williamsianum) Rhododendron 'Elfenbein' Ericaceae 024  
00003508 Rhododendron 'Elfenfee' (R. Letty Edwards Group hybrid) Rhododendron 'Elfenfee' Ericaceae 139  
00004258 Rhododendron 'Elizabeth' (R. forrestii × R. griersonianum) Rhododendron 'Elizabeth' Ericaceae 008
00006660 Rhododendron 'Elizabeth Red Foliage' Rhododendron 'Elizabeth Red Foliage' Ericaceae 048
00003417 Rhododendron 'Ella' (R. smirnowii × R. 'Mrs. Milner') Rhododendron 'Ella' Ericaceae 024
00009019 Rhododendron 'Elsie Pratt' (Knap Hill/Exbury) Rhododendron 'Elsie Pratt' Ericaceae 035  
00009101 Rhododendron 'Elsie Straver' (R. campylocarpum hybrid) Rhododendron 'Elsie Straver' Ericaceae 010
00001679 Rhododendron 'Emanuela' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Emanuela' Ericaceae 117  
00007550 Rhododendron 'Emelie' (R. wardii hybrid) Rhododendron 'Emelie' Ericaceae 165  
00003733 Rhododendron 'Emile' (Harde Gentse) Rhododendron 'Emile' Ericaceae 105
00006254 Rhododendron 'Emma' (Harde Gentse) Rhododendron 'Emma' Ericaceae 155  
00003008 Rhododendron 'Erich' (R. 'Mrs Milner' × R. 'Catawbiense Grandiflorum') Rhododendron 'Erich' Ericaceae 036  
00001700 Rhododendron 'Erlkönig' (R. yakushimanum × ((R. fortunei subsp. discolor × R. 'Catharina van Tol') × R. dichroanthum subsp. scyphocalyx))) Rhododendron 'Erlkönig' Ericaceae 117  
00003009 Rhododendron ×erythrocalyx Balf.f. & Forrest (R. selense × R. wardii) Rhododendron Ericaceae 036
00001009 Rhododendron ×erythrocalyx Balf.f. & Forrest (R. selense × R. wardii) Rhododendron Ericaceae 108
00003734 Rhododendron 'Esmeralda' (Harde Gentse/Rustica) Rhododendron 'Esmeralda' Ericaceae 102
00001308 Rhododendron 'Estrella' (Japanse azalea) † Rhododendron 'Estrella' Ericaceae ---
00003412 Rhododendron 'Esveld Select' (R. yakushimanum × R. smirnowii) Rhododendron 'Esveld Select' Ericaceae 024
00001038 Rhododendron 'Esveld Select' (R. yakushimanum × R. smirnowii) Rhododendron 'Esveld Select' Ericaceae 150  
00003367 Rhododendron 'Etoile de Sleidinge' (R. caucasicum hybrid) Rhododendron 'Etoile de Sleidinge' Ericaceae 036
00007919 Rhododendron eudoxum Balf.f. & Forrest Rhododendron Ericaceae 002
00003735 Rhododendron 'Eugenie' (Harde Gentse) Rhododendron 'Eugenie' Ericaceae 105
00001348 Rhododendron 'Eureka' (Japanse azalea) Rhododendron 'Eureka' Ericaceae 118
00001046 Rhododendron 'Evelyn' (R. 'Oudijk's Sensation' × R. 'Daisy') Rhododendron 'Evelyn' Ericaceae 122
00004139 Rhododendron 'Evelyn' (R. 'Oudijk's Sensation' × R. 'Daisy') Rhododendron 'Evelyn' Ericaceae 024  
00005171 Rhododendron 'Exbury White' (Knap Hill/Exbury) Rhododendron 'Exbury White' Ericaceae 014
00003459 Rhododendron 'Excelsior' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') † Rhododendron 'Excelsior' Ericaceae ---
00003497 Rhododendron Fabia Group 'Dreamland' (R. yakushimanum hybrid) † Rhododendron 'Dreamland' Ericaceae ---
00009109 Rhododendron Fabia Group 'Fabia' (R. dichroanthum × R. griersonianum) Rhododendron 'Fabia' Ericaceae 015
00007419 Rhododendron 'Faggetter's Favourite' (R. fortunei hybrid) Rhododendron 'Faggetter's Favourite' Ericaceae 106
00001343 Rhododendron 'Fago no fugi' (Japanse azalea) Rhododendron 'Fago no fugi' Ericaceae 118  
00007110 Rhododendron 'Falling Snow' (R. 'Powell Glass' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Falling Snow' Ericaceae 149
00004977 Rhododendron 'Fama' (Harde Gentse) Rhododendron 'Fama' Ericaceae 149
00005657 Rhododendron 'Fanal' (Knap Hill/Exbury) Rhododendron 'Fanal' Ericaceae 108
00006252 Rhododendron 'Fanny' (Knap Hill/Exbury) Rhododendron 'Fanny' Ericaceae 155
00003476 Rhododendron 'Fantastica' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Fantastica' Ericaceae ---
00007442 Rhododendron 'Fashing' (Knap Hill/Exbury) Rhododendron 'Fashing' Ericaceae 166
00001635 Rhododendron fastigiatum Franch. Rhododendron Ericaceae 125
00006249 Rhododendron 'Fénelon' (Harde Gentse/Rustica) Rhododendron 'Fénelon' Ericaceae 155
00009088 Rhododendron 'Fénélon' (Harde Gentse/Rustica) Rhododendron 'Fénélon' Ericaceae 174
00001384 Rhododendron ferrugineum L. 'Compactum' Rhododendron 'Compactum' Ericaceae 132  
00008021 Rhododendron 'Festivo' (R. 'Hachmann's Polaris' × R. wardii) Rhododendron 'Festivo' Ericaceae 165
00003013 Rhododendron 'Feuerschein' (R. 'Nova Zembla' × R. 'Mars') Rhododendron 'Feuerschein' Ericaceae 036  
00005655 Rhododendron 'Feuerwerk' (Knap Hill/Exbury) Rhododendron 'Feuerwerk' Ericaceae 108
20060004 Rhododendron 'Fidèle Mechelynck' (Harde Gentse) Rhododendron 'Fidèle Mechelynck' Ericaceae 176  
00001353 Rhododendron 'Fireball' (Knap Hill/Exbury) Rhododendron 'Fireball' Ericaceae 148
00003713 Rhododendron 'Fireball' (Knap Hill/Exbury) Rhododendron 'Fireball' Ericaceae 107
00001138 Rhododendron 'Fireball' (Knap Hill/Exbury) Rhododendron 'Fireball' Ericaceae 107
00009013 Rhododendron 'Fireglow' (Knap Hill/Exbury) Rhododendron 'Fireglow' Ericaceae 009
00001010 Rhododendron 'Fireman Jeff' (R. 'The Honourable Jean Marie de Montague' × R. Grosclaude Group) Rhododendron 'Fireman Jeff' Ericaceae 108  
00003736 Rhododendron 'Flammeolum Incarnatum' (Harde Gentse) Rhododendron 'Flammeolum Incarnatum' Ericaceae 105
00001113 Rhododendron 'Floralie' (R. yakushimanum × R. 'Kluis Sensation') Rhododendron 'Floralie' Ericaceae 121  
00007916 Rhododendron floribundum Franch. Rhododendron Ericaceae 001
00001279 Rhododendron 'Florida' (Japanse azalea) Rhododendron 'Florida' Ericaceae 118
20150159 Rhododendron 'Florida' (Japanse azalea) Rhododendron 'Florida' Ericaceae  
00009038 Rhododendron 'Florodora' (R. molle hybrid) Rhododendron 'Florodora' Ericaceae 175  
00004392 Rhododendron 'Forlana' (R. 'Goldsworth Orange' × R. 'Mrs J. G. Millais') Rhododendron 'Forlana' Ericaceae 140
20150145 Rhododendron formosanum Hemsl. Rhododendron Ericaceae  
00006580 Rhododendron fortunei Lindl. Rhododendron Ericaceae 051
00007420 Rhododendron 'Fox Hunter' (R. Matador Group × R. Gaul Group) Rhododendron 'Fox Hunter' Ericaceae 106  
00007135 Rhododendron 'François De Taye' (Harde Gentse) Rhododendron 'François De Taye' Ericaceae 162  
00005484 Rhododendron 'Frans van der Bom' (R. molle hybrid) Rhododendron 'Frans van der Bom' Ericaceae 107
00003737 Rhododendron 'Frederic de Merode' (Harde Gentse/Rustica) Rhododendron 'Frederic de Merode' Ericaceae 102
00001378 Rhododendron 'Fred Peste' ((R. yakushimanum × R. 'Corona') × R. haematodes) Rhododendron 'Fred Peste' Ericaceae 153
00006425 Rhododendron 'Frère-Orban' (Harde Gentse/Rustica) Rhododendron 'Frère-Orban' Ericaceae 152
00005662 Rhododendron 'Freya' (Harde Gentse/Rustica) Rhododendron 'Freya' Ericaceae 117
00001049 Rhododendron 'Freya Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Freya Heinje' Ericaceae 121  
00003473 Rhododendron 'Freya Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') † Rhododendron 'Freya Heinje' Ericaceae ---
00001300 Rhododendron 'Fridoline' (Japanse azalea) Rhododendron 'Fridoline' Ericaceae 118
00009007 Rhododendron 'Fridtjof Nansen' (Knap Hill/Exbury) Rhododendron 'Fridtjof Nansen' Ericaceae 006
20140037 Rhododendron 'Frieda Diddens' Rhododendron 'Frieda Diddens' Ericaceae 000  
00005438 Rhododendron 'Fritz Quihou' (Harde Gentse) Rhododendron 'Fritz Quihou' Ericaceae 103
00001313 Rhododendron 'Frühlingsanfang' (R. 'Albert Schweitzer' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Frühlingsanfang' Ericaceae 121
00003379 Rhododendron 'Furnival's Daughter' (R. 'Mrs. Furnival seedling) Rhododendron 'Furnival's Daughter' Ericaceae 036  
20150132 Rhododendron 'Fürst Camille von Rohan' (Harde Gentse) Rhododendron 'Fürst Camille von Rohan' Ericaceae  
00005646 Rhododendron 'Gabriela' (R. yakushimanum hybrid) Rhododendron 'Gabriela' Ericaceae 150
00001286 Rhododendron 'Gabriele' (Japanse azalea) Rhododendron 'Gabriele' Ericaceae 118  
00003408 Rhododendron 'Gartendirektor Glocker' (R. 'Doncaster' × R. williamsianum) Rhododendron 'Gartendirektor Glocker' Ericaceae 024  
00001055 Rhododendron 'Gartendirektor Glocker' (R. 'Doncaster' × R. williamsianum) Rhododendron 'Gartendirektor Glocker' Ericaceae 122  
00003403 Rhododendron 'Gartendirektor Rieger' (R. 'Adriaan Koster' × R. williamsianum) Rhododendron 'Gartendirektor Rieger' Ericaceae 024
00001318 Rhododendron 'Gartendirektor Rieger' (R. 'Adriaan Koster' × R. williamsianum) Rhododendron 'Gartendirektor Rieger' Ericaceae 122
20120096 Rhododendron 'Gay Paree' Rhododendron 'Gay Paree' Ericaceae  
20150141 Rhododendron 'Général Brialmont' (Harde Gentse) Rhododendron 'Général Brialmont' Ericaceae  
00006421 Rhododendron 'General Trauff' (Harde Gentse) Rhododendron 'General Trauff' Ericaceae 152
00007443 Rhododendron 'George Reynolds' (Knap Hill/Exbury) Rhododendron 'George Reynolds' Ericaceae 140
00003010 Rhododendron 'Germania' ((R. 'Antoon van Welie' × R. williamsianum) × R. 'Catherine van Tol')) Rhododendron 'Germania' Ericaceae 036
00005663 Rhododendron 'Gibraltar' (Knap Hill/Exbury) Rhododendron 'Gibraltar' Ericaceae 108
00001347 Rhododendron 'Gilbert Mullie' (Japanse azalea) Rhododendron 'Gilbert Mullie' Ericaceae 118  
00001339 Rhododendron 'Ginny Gee' (R. keiskei 'Yaku Fairy' × R. racemosum) Rhododendron 'Ginny Gee' Ericaceae 136
00007106 Rhododendron glaucophyllum Rehder Rhododendron Ericaceae 054  
00003395 Rhododendron 'Glennyanum' (R. caucasicum hybrid) Rhododendron 'Glennyanum' Ericaceae 036
00001216 Rhododendron 'Gletschernacht' (R. russatum × R. 'Blue Diamond') Rhododendron 'Gletschernacht' Ericaceae 127  
00004562 Rhododendron 'Gletschernacht' (R. russatum × R. 'Blue Diamond') Rhododendron 'Gletschernacht' Ericaceae 108
00004973 Rhododendron 'Gloire de Belgique' (Harde Gentse) Rhododendron 'Gloire de Belgique' Ericaceae 149
00004123 Rhododendron 'Gloria Mundi' (Harde Gentse) Rhododendron 'Gloria Mundi' Ericaceae 102
00001155 Rhododendron 'Glowing Embers' (Knap Hill/Exbury) Rhododendron 'Glowing Embers' Ericaceae 148  
00004134 Rhododendron 'Glowing Embers' (Knap Hill/Exbury) Rhododendron 'Glowing Embers' Ericaceae 107
00005357 Rhododendron 'Glowing Embers' (Knap Hill/Exbury) Rhododendron 'Glowing Embers' Ericaceae 034  
00001135 Rhododendron 'Glowing Embers' (Knap Hill/Exbury) Rhododendron 'Glowing Embers' Ericaceae 148
00005661 Rhododendron 'Glulicht' (Knap Hill/Exbury) Rhododendron 'Glulicht' Ericaceae 108
00009022 Rhododendron 'Gog' (Knap Hill/Exbury) Rhododendron 'Gog' Ericaceae 010
00003512 Rhododendron 'Goldbukett' (R. 'Scintillation' × R. wardii) Rhododendron 'Goldbukett' Ericaceae 139
00007437 Rhododendron 'Golden Dream' (R. Naomi Group × R. campylocarpum) Rhododendron 'Golden Dream' Ericaceae 166
00005639 Rhododendron 'Golden Eagle' (Knap Hill/Exbury) † Rhododendron 'Golden Eagle' Ericaceae ---
00004127 Rhododendron 'Golden Eagle' (Knap Hill/Exbury) † Rhododendron 'Golden Eagle' Ericaceae ---
00004132 Rhododendron 'Golden Eagle' (Knap Hill/Exbury) Rhododendron 'Golden Eagle' Ericaceae 107
00001134 Rhododendron 'Golden Eagle' (Knap Hill/Exbury) Rhododendron 'Golden Eagle' Ericaceae 148  
00007444 Rhododendron 'Goldeneye' (Knap Hill/Exbury) Rhododendron 'Goldeneye' Ericaceae 166
00004138 Rhododendron 'Golden Flare' (Knap Hill/Exbury) Rhododendron 'Golden Flare' Ericaceae 107
00001240 Rhododendron 'Golden Fleece' (R. 'Goldsworth Orange' × R. Yvonne Group) † Rhododendron 'Golden Fleece' Ericaceae ---
00004276 Rhododendron 'Golden Sunset' (R. molle hybrid) Rhododendron 'Golden Sunset' Ericaceae 148
00006517 Rhododendron 'Golden Torch' (R. 'Bambi' × (R. Grosclaude Group × R. griersonianum)) Rhododendron 'Golden Torch' Ericaceae 150
00006647 Rhododendron 'Goldflamme' (Knap Hill/Exbury) Rhododendron 'Goldflamme' Ericaceae 048
00001011 Rhododendron 'Goldflimmer' (seedling R. ponticum?, R. catawbiense?) Rhododendron 'Goldflimmer' Ericaceae 108
00005086 Rhododendron 'Goldflimmer' (seedling R. ponticum?, R. catawbiense?) † Rhododendron 'Goldflimmer' Ericaceae ---
00004117 Rhododendron 'Goldlack' (Harde Gentse) Rhododendron 'Goldlack' Ericaceae 110
00005361 Rhododendron 'Goldpracht' (Knap Hill/Exbury) Rhododendron 'Goldpracht' Ericaceae 034  
00009096 Rhododendron 'Goldsworth Yellow' (R. campylocarpum × R. caucasicum) Rhododendron 'Goldsworth Yellow' Ericaceae 004
00007104 Rhododendron 'Goldtopaz' (Knap Hill/Exbury) Rhododendron 'Goldtopaz' Ericaceae 048  
00009125 Rhododendron 'Golfer' (R. yakushimanum × R. pseudochrysanthum) Rhododendron 'Golfer' Ericaceae 111  
00001288 Rhododendron 'Gorbella' (Japanse azalea) Rhododendron 'Gorbella' Ericaceae 118
00003407 Rhododendron 'Görlitz' (R. 'Rinaldo' × R. williamsianum) Rhododendron 'Görlitz' Ericaceae 024  
00007298 Rhododendron 'Graciosum' (R. occidentale hybrid) Rhododendron 'Graciosum' Ericaceae 161  
00004583 Rhododendron 'Graf Alfred von Niepperg' (Harde Gentse) Rhododendron 'Graf Alfred von Niepperg' Ericaceae 150
00001112 Rhododendron 'Graf Anton Gunther' (R. yakushimanum × R. 'Britannia') Rhododendron 'Graf Anton Gunther' Ericaceae 121  
00005354 Rhododendron 'Graf von Meran' (Harde Gentse) Rhododendron 'Graf von Meran' Ericaceae 034
00004971 Rhododendron 'Graf von Meran' (Harde Gentse) Rhododendron 'Graf von Meran' Ericaceae 105
00001307 Rhododendron 'Granada' (Japanse azalea) Rhododendron 'Granada' Ericaceae 118
00005671 Rhododendron 'Grandeur Triomphante' (Harde Gentse) Rhododendron 'Grandeur Triomphante' Ericaceae 117
00003012 Rhododendron 'Grandezza' (R. 'Furnival's Daughter' × R. 'Roseum Elegans') Rhododendron 'Grandezza' Ericaceae 036
00008082 Rhododendron 'Graziella' (R. ponticum × R. roxieanum ?) Rhododendron 'Graziella' Ericaceae 004
00009080 Rhododendron 'Great Dane' (R. yakushimanum × R. rex) Rhododendron 'Great Dane' Ericaceae 175
00007309 Rhododendron 'Grenadine' ??? Rhododendron 'Grenadine' Ericaceae 166  
00000390 Rhododendron groenlandicum Kron & Judd Rhododendron Ericaceae 135  
00002515 Rhododendron groenlandicum Kron & Judd Rhododendron Ericaceae 007  
00003423 Rhododendron 'Grugaperle' (R. insigne × R. williamsianum) † Rhododendron 'Grugaperle' Ericaceae ---
00001012 Rhododendron 'Grugaperle' (R. insigne × R. williamsianum) Rhododendron 'Grugaperle' Ericaceae 109
00001088 Rhododendron 'Grumpy' (R. yakushimanum × ? hybrid) Rhododendron 'Grumpy' Ericaceae 153
00003447 Rhododendron 'Grumpy' (R. yakushimanum × ? hybrid) † Rhododendron 'Grumpy' Ericaceae ---
00006410 Rhododendron 'Guelder Rose' (Harde Gentse) Rhododendron 'Guelder Rose' Ericaceae 152
20080020 Rhododendron 'Guillaume II' (Harde Gentse) Rhododendron 'Guillaume II' Ericaceae 176
00001311 Rhododendron 'Gunborg' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Gunborg' Ericaceae 121
00005670 Rhododendron 'Gwynidd Lloyd' (Knap Hill/Exbury) Rhododendron 'Gwynidd Lloyd' Ericaceae 108
00004551 Rhododendron 'Hachmann's Bananaflip' (R. brachycarpum subsp. fauriei × R. 'Goldsworth Orange') Rhododendron 'Hachmann's Bananaflip' Ericaceae 139
00001091 Rhododendron 'Hachmann's Belona' (R. yakushimanum 'Koichiro Wada' × R. 'Britannia') Rhododendron 'Hachmann's Belona' Ericaceae 121
00003486 Rhododendron 'Hachmann's Belona' (R. yakushimanum 'Koichiro Wada' × R. 'Britannia') † Rhododendron 'Hachmann's Belona' Ericaceae ---
00003002 Rhododendron 'Hachmann's Brasilia' ((R. 'Omega' × R. wardii) × (R. wardii × R. 'Alice Street')) Rhododendron 'Hachmann's Brasilia' Ericaceae 036
00009112 Rhododendron 'Hachmann's Constanze' (R. 'Humboldt' × R. 'Kluis Sensation') Rhododendron 'Hachmann's Constanze' Ericaceae 011  
00009079 Rhododendron 'Hachmann's Cornelia' (R. yakushimanum 'Koichiro Wada' × R. 'Britannia') Rhododendron 'Hachmann's Cornelia' Ericaceae 175
00003402 Rhododendron 'Hachmann's Diadem' (R. 'Hachmann's Ornament' × R. 'Furnivall's Daughter') Rhododendron 'Hachmann's Diadem' Ericaceae 036
00006645 Rhododendron 'Hachmann's Juanita' (Knap Hill/Exbury) Rhododendron 'Hachmann's Juanita' Ericaceae 048
00001094 Rhododendron 'Hachmann's Marlis' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Hachmann's Marlis' Ericaceae 121
00003455 Rhododendron 'Hachmann's Marlis' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Hachmann's Marlis' Ericaceae ---
00001103 Rhododendron 'Hachmann's Polaris' (R. yakushimanum 'Koichiro Wada' × R. 'Omega') Rhododendron 'Hachmann's Polaris' Ericaceae 121
00001723 Rhododendron 'Hachmann's Porzellan' (R. 'Mrs. J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Hachmann's Porzellan' Ericaceae 117
00001116 Rhododendron 'Hachmann's Porzellan' (R. 'Mrs. J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Hachmann's Porzellan' Ericaceae 121
00003490 Rhododendron 'Hachmann's Porzellan' (R. 'Mrs. J. G. Millais' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Hachmann's Porzellan' Ericaceae ---
00003927 Rhododendron 'Hachmann's Rosarka' (R. insigne × R. 'Spitfire') Rhododendron 'Hachmann's Rosarka' Ericaceae 105
00001052 Rhododendron 'Hachmann's Rosita' (R. 'Kokardia' × (R. 'Mars' × R. yakushimanum 'Koichiro Wada')) Rhododendron 'Hachmann's Rosita' Ericaceae 121  
00004261 Rhododendron 'Halfdan Lem' (R. 'The Honourable Jean Marie de Montague' × R. 'Red Loderi') Rhododendron 'Halfdan Lem' Ericaceae 036
00003076 Rhododendron 'Hallelujah' (R. 'The Honourable Jean Marie de Montague' × R. 'Kimberley') Rhododendron 'Hallelujah' Ericaceae 036
00001063 Rhododendron 'Hallelujah' (R. 'The Honourable Jean Marie de Montague' × R. 'Kimberley') Rhododendron 'Hallelujah' Ericaceae 122
00004602 Rhododendron 'Haruko' (Japanse azalea) Rhododendron 'Haruko' Ericaceae 118
00003014 Rhododendron 'Harvest Moon' (R. 'Mrs Lindsay Smith' × R. campylocarpum hybrid) Rhododendron 'Harvest Moon' Ericaceae 036  
00001349 Rhododendron 'Hatsugiri' (Japanse azalea) Rhododendron 'Hatsugiri' Ericaceae 118  
00009095 Rhododendron 'Hawk Crest' (R. wardii × R. Lady Bessborough Group) Rhododendron 'Hawk Crest' Ericaceae 010  
00001356 Rhododendron 'Heidelberg' Rhododendron 'Heidelberg' Ericaceae 122  
00001616 Rhododendron 'Heinje's Schneewittchen' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Heinje's Schneewittchen' Ericaceae 117
00009075 Rhododendron 'Heinje's Venezia' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Heinje's Venezia' Ericaceae 175  
00001312 Rhododendron 'Heinje's Venezia' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Heinje's Venezia' Ericaceae 121  
00003468 Rhododendron 'Heinje's Venezia' (R. 'Cynthia' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Heinje's Venezia' Ericaceae ---
00001121 Rhododendron 'Heinje's Zauberflöte' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Heinje's Zauberflöte' Ericaceae 121
00003460 Rhododendron 'Heinje's Zauberflöte' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') † Rhododendron 'Heinje's Zauberflöte' Ericaceae ---
00001344 Rhododendron 'Helena' (Japanse azalea) Rhododendron 'Helena' Ericaceae 118
00007548 Rhododendron 'Helena' (R. 'Scintilation' × R. wardii) Rhododendron 'Helena' Ericaceae 111
00005652 Rhododendron 'Helena Pratt' (Knap Hill/Exbury) Rhododendron 'Helena Pratt' Ericaceae 108  
00003257 Rhododendron 'Helene Schiffner' hybrid (R. 'Helene Schiffner' × R. williamsianum) Rhododendron 'Helene Schiffner' Ericaceae 122
00003245 Rhododendron 'Helgoland' (R. 'Scandinavia' × R. yakushimanum 'Hanano Ego') Rhododendron 'Helgoland' Ericaceae 149
00008215 Rhododendron 'Herbert' (Japanse azalea) Rhododendron 'Herbert' Ericaceae 118  
00003444 Rhododendron 'Herbert' (Japanse azalea) Rhododendron 'Herbert' Ericaceae 025  
00004441 Rhododendron 'Herbert' (Japanse azalea) Rhododendron 'Herbert' Ericaceae 118
00001281 Rhododendron 'Herbert' (Japanse azalea) Rhododendron 'Herbert' Ericaceae 118  
20150161 Rhododendron 'Herbert' (Japanse azalea) Rhododendron 'Herbert' Ericaceae  
00009102 Rhododendron 'Herkules' (R. campanulatum hybrid) Rhododendron 'Herkules' Ericaceae 004
00003920 Rhododendron 'Hermann Backhus' (R. catawbiense hybrid ?) Rhododendron 'Hermann Backhus' Ericaceae 105
00004979 Rhododendron 'Heroine' (Harde Gentse) Rhododendron 'Heroine' Ericaceae 149
00004582 Rhododendron 'Heureuse Surprise' (Harde Gentse) Rhododendron 'Heureuse Surprise' Ericaceae 150
00004443 Rhododendron 'Hino-crimson' (Japanse azalea) Rhododendron 'Hino-crimson' Ericaceae 118  
00001350 Rhododendron 'Hino-crimson' (Japanse azalea) Rhododendron 'Hino-crimson' Ericaceae 118  
00007456 Rhododendron 'Hinodigeri' (Japanse azalea) Rhododendron 'Hinodigeri' Ericaceae 118  
00005681 Rhododendron hippophaeoides Balf.f. & W.W.Sm. Rhododendron Ericaceae 036
00005813 Rhododendron hippophaeoides Balf.f. & W.W.Sm. Rhododendron Ericaceae 036  
00008167 Rhododendron hippophaeoides Balf.f. & W.W.Sm. Rhododendron Ericaceae 036
00001610 Rhododendron hippophaeoides Balf.f. & W.W.Sm. † Rhododendron Ericaceae ---  
00002973 Rhododendron hirsutum L. Rhododendron Ericaceae 136
00007913 Rhododendron hirtipes Tagg † Rhododendron Ericaceae ---  
00004578 Rhododendron 'Hollandia' (Harde Gentse) Rhododendron 'Hollandia' Ericaceae 150
00003388 Rhododendron 'Hollandia' (R. 'Pink Pearl' × R. 'Charles Dickens') Rhododendron 'Hollandia' Ericaceae 036
00005365 Rhododendron 'Homebush' (Knap Hill/Exbury) Rhododendron 'Homebush' Ericaceae 034
00005811 Rhododendron 'Homebush' (Knap Hill/Exbury) Rhododendron 'Homebush' Ericaceae 108
00006634 Rhododendron 'Honeysuckle' (Knap Hill/Exbury) Rhododendron 'Honeysuckle' Ericaceae 049
00004112 Rhododendron 'Honneur de Flandre' (Harde Gentse) Rhododendron 'Honneur de Flandre' Ericaceae 110
00001622 Rhododendron 'Hoppy' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Hoppy' Ericaceae 117
00003896 Rhododendron 'Hoppy' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Hoppy' Ericaceae 117
00004592 Rhododendron 'Hora' (Harde Gentse/Rustica) Rhododendron 'Hora' Ericaceae 111
00004133 Rhododendron 'Hortulanus H. Witte' (R. molle hybrid) Rhododendron 'Hortulanus H. Witte' Ericaceae 107
00006436 Rhododendron 'Hotei' (R. 'Goldsworth Orange' × (R. souliei × R. wardii)) Rhododendron 'Hotei' Ericaceae 108  
00007317 Rhododendron 'Hot Shot Variegated' (Japanse azalea) Rhododendron 'Hot Shot Variegated' Ericaceae 118  
00009012 Rhododendron 'Hotspur' (Knap Hill/Exbury) † Rhododendron 'Hotspur' Ericaceae ---
00009039 Rhododendron 'Hotspur Oranje' (R. molle hybrid) Rhododendron 'Hotspur Oranje' Ericaceae 175  
00004129 Rhododendron 'Hotspur Red' (Knap Hill/Exbury) Rhododendron 'Hotspur Red' Ericaceae 107
00001137 Rhododendron 'Hotspur Red' (Knap Hill/Exbury) Rhododendron 'Hotspur Red' Ericaceae 148
00001157 Rhododendron 'Hotspur Red' (Knap Hill/Exbury) Rhododendron 'Hotspur Red' Ericaceae 148
00003398 Rhododendron 'Hugh Koster' (R. 'George Hardy' × R. 'Doncaster' hybrid) Rhododendron 'Hugh Koster' Ericaceae 036
00007445 Rhododendron 'Hugh Wormald' (Knap Hill/Exbury) Rhododendron 'Hugh Wormald' Ericaceae 166
00009115 Rhododendron 'Hultschin' (R. insigne × R. williamsianum) Rhododendron 'Hultschin' Ericaceae 010
00001013 Rhododendron 'Hultschin' (R. insigne × R. williamsianum) Rhododendron 'Hultschin' Ericaceae 109
00001037 Rhododendron Humming Bird Group 'Humming Bird' (R. haematodes × R. williamsianum) Rhododendron 'Humming Bird' Ericaceae 122
00009085 Rhododendron 'Hydon Ball' (R. yakushimanum × R. 'Springbok') Rhododendron 'Hydon Ball' Ericaceae 175
00001150 Rhododendron 'Hydon Dawn' (R. yakushimanum × R. 'Springbok') Rhododendron 'Hydon Dawn' Ericaceae 121
00001100 Rhododendron 'Hydon Dawn' (R. yakushimanum × R. 'Springbok') Rhododendron 'Hydon Dawn' Ericaceae 121
00003916 Rhododendron 'Hydon Hunter' (R. yakushimanum × R. 'Springbok') Rhododendron 'Hydon Hunter' Ericaceae 150
00001656 Rhododendron 'Hydon Velvet' (R. yakushimanum × R. bureavii) Rhododendron 'Hydon Velvet' Ericaceae 111  
00007421 Rhododendron 'Hyperion' (R. Cardinal Group × R. forrestii subsp. forrestii) Rhododendron 'Hyperion' Ericaceae 106
00007912 Rhododendron hyperythrum Hayata Rhododendron Ericaceae 001
00003921 Rhododendron 'Idomeneo' (R. yakushimanum × 'Mars') Rhododendron 'Idomeneo' Ericaceae 150  
00004124 Rhododendron 'Igneum Novum' (Harde Gentse) Rhododendron 'Igneum Novum' Ericaceae 102
00003739 Rhododendron 'Igneum Novum' (Harde Gentse) Rhododendron 'Igneum Novum' Ericaceae 105
00005674 Rhododendron 'Il Tasso' (Harde Gentse/Rustica) Rhododendron 'Il Tasso' Ericaceae 117
00007447 Rhododendron 'Imago' (Knap Hill/Exbury) Rhododendron 'Imago' Ericaceae 166
00005558 Rhododendron 'Imbricatum' (R. ponticum hybrid?) Rhododendron 'Imbricatum' Ericaceae 134
00005445 Rhododendron impeditum Balf.f. & W.W.Sm. Rhododendron Ericaceae 108
00001219 Rhododendron impeditum Balf.f. & W.W.Sm. Rhododendron Ericaceae 133
00007186 Rhododendron impeditum Balf.f. & W.W.Sm. Rhododendron Ericaceae 161  
00007316 Rhododendron impeditum Balf.f. & W.W.Sm. 'Album' Rhododendron 'Album' Ericaceae 161  
00001014 Rhododendron 'Impi' (R. sanguineum subsp. didymum × R. 'Moser's Maroon') Rhododendron 'Impi' Ericaceae 108  
00001241 Rhododendron 'Inamorata' (R. wardii × R. fortunei subsp. discolor) † Rhododendron 'Inamorata' Ericaceae ---
00001704 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001703 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001706 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001705 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108
00001712 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001709 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108
00001707 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001708 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108
00001702 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' Rhododendron 'Inamorata' Ericaceae 108  
00001710 Rhododendron 'Inamorata' × R. 'Tortoiseshell Orange' (seedling) Rhododendron 'Inamorata' Ericaceae 108
00001098 Rhododendron 'Inca' (R. 'Louis Pasteur' × R. yakushimanum) Rhododendron 'Inca' Ericaceae 121
00001661 Rhododendron 'Inez' (R. yakushimanum hybrid) Rhododendron 'Inez' Ericaceae 117
00003418 Rhododendron 'Inselin' (R. insigne × R. ’Graf Zeppelin’) Rhododendron 'Inselin' Ericaceae 024  
00001324 Rhododendron insigne Hemsl. & E.H.Wilson Rhododendron Ericaceae 109  
00004434 Rhododendron 'Insurpassable' (Japanse azalea) Rhododendron 'Insurpassable' Ericaceae 118  
00001393 Rhododendron 'Insurpassable' (Japanse azalea) Rhododendron 'Insurpassable' Ericaceae 118  
20150131 Rhododendron 'Invectissimum' (Harde Gentse) Rhododendron 'Invectissimum' Ericaceae  
00007296 Rhododendron 'Irene Koster' (R. occidentale hybrid) Rhododendron 'Irene Koster' Ericaceae 161
00001048 Rhododendron 'Isadora' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Isadora' Ericaceae 121  
00003463 Rhododendron 'Isadora' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') † Rhododendron 'Isadora' Ericaceae ---
20080236 Rhododendron 'Jack A. Sand' (Knap Hill/Exbury) Rhododendron 'Jack A. Sand' Ericaceae 000  
00006585 Rhododendron 'Jack Skilton' (R. lacteum × R. 'Mrs Lindsay Smith') Rhododendron 'Jack Skilton' Ericaceae 056
00003015 Rhododendron 'Jacksonii' (R. caucasicum × R. Nobleanum Group) Rhododendron 'Jacksonii' Ericaceae 036
00001244 Rhododendron 'James Nasmyth' Rhododendron 'James Nasmyth' Ericaceae 103
00001242 Rhododendron 'James Nasmyth' × R. discolor Rhododendron 'James Nasmyth' Ericaceae 103
00001086 Rhododendron 'Jane Redford' (R. yakushimanum × R. decorum) Rhododendron 'Jane Redford' Ericaceae 120
00003016 Rhododendron 'Janet Blair' Rhododendron 'Janet Blair' Ericaceae 036
00001345 Rhododendron 'Jeannette' (Japanse azalea) Rhododendron 'Jeannette' Ericaceae 118
00007138 Rhododendron 'Jenny Lind' (Harde Gentse) Rhododendron 'Jenny Lind' Ericaceae 163
00007302 Rhododendron 'Jock Brydon' (R. occidentale hybrid) Rhododendron 'Jock Brydon' Ericaceae 161  
00004538 Rhododendron 'Johanna' (Japanse azalea) Rhododendron 'Johanna' Ericaceae 118  
20150152 Rhododendron 'Johanna' (Japanse azalea) Rhododendron 'Johanna' Ericaceae  
00004137 Rhododendron 'Jolie Madame' (R. viscosum hybrid) Rhododendron 'Jolie Madame' Ericaceae 107
00001141 Rhododendron 'Jolie Madame' (R. viscosum hybrid) Rhododendron 'Jolie Madame' Ericaceae 119
00004121 Rhododendron 'Josephine Klinger' (Harde Gentse) Rhododendron 'Josephine Klinger' Ericaceae 102
00003740 Rhododendron 'Joseph Napoleon Baumann' (Harde Gentse) Rhododendron 'Joseph Napoleon Baumann' Ericaceae 102
00004113 Rhododendron 'Julda Schipp' (Harde Gentse) Rhododendron 'Julda Schipp' Ericaceae 110
00006244 Rhododendron 'Juliana Nova' (Harde Gentse) Rhododendron 'Juliana Nova' Ericaceae 155
20150133 Rhododendron 'Julie Dupont' (Harde Gentse) Rhododendron 'Julie Dupont' Ericaceae  
00004603 Rhododendron kaempferi Planch. Rhododendron Ericaceae 118  
00001117 Rhododendron 'Kalinka' (R. 'Morgenrot' × (R. 'Mars' × R. yakushimanum 'Koichiro Wada')) Rhododendron 'Kalinka' Ericaceae 121
00003483 Rhododendron 'Kalinka' (R. 'Morgenrot' × (R. 'Mars' × R. yakushimanum 'Koichiro Wada')) † Rhododendron 'Kalinka' Ericaceae ---
00003480 Rhododendron 'Kantilene' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Kantilene' Ericaceae ---
00003435 Rhododendron 'Karin' (R. 'Britannia' × R. williamsianum) Rhododendron 'Karin' Ericaceae 024  
00003425 Rhododendron 'Karin Seleger' (R. insigne hybrid) Rhododendron 'Karin Seleger' Ericaceae 024  
00003017 Rhododendron 'Karl Sauerborn' (R. wardii hybrid) Rhododendron 'Karl Sauerborn' Ericaceae 036
00001047 Rhododendron 'Käthe Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Käthe Heinje' Ericaceae 121
00003414 Rhododendron 'Katherine Dalton' (R. smirnowii × R. fortunei) Rhododendron 'Katherine Dalton' Ericaceae 024
00006432 Rhododendron 'Kathleen' (Japanse azalea) Rhododendron 'Kathleen' Ericaceae 118  
00001335 Rhododendron keiskei Miq. 'Ebino' Rhododendron 'Ebino' Ericaceae 136
00001336 Rhododendron keiskei Miq. × R. minus Rhododendron Ericaceae 134  
00003890 Rhododendron 'Ken Janeck' (R. yakushimanum seedling) Rhododendron 'Ken Janeck' Ericaceae 111  
00001124 Rhododendron 'Ken Janeck' (R. yakushimanum seedling) Rhododendron 'Ken Janeck' Ericaceae 120
00001282 Rhododendron 'Kermesina Rosé' (Japanse azalea) Rhododendron 'Kermesina Rosé' Ericaceae 118  
20120211 Rhododendron kesangiae D.G.Long & Rushforth Rhododendron Ericaceae
00001016 Rhododendron 'King of Shrubs' (R. fortunei subsp. discolor × R. Fabia Group) Rhododendron 'King of Shrubs' Ericaceae 108  
00001201 Rhododendron 'King of Shrubs' (R. fortunei subsp. discolor × R. Fabia Group) Rhododendron 'King of Shrubs' Ericaceae 108  
00005638 Rhododendron 'King's Ride' (Azalea) Rhododendron 'King's Ride' Ericaceae 148
00007631 Rhododendron 'King's Ride' (R. insigne × R. yakushimanum) Rhododendron 'King's Ride' Ericaceae 111  
00009073 Rhododendron 'King's Ride' (R. insigne × R. yakushimanum) Rhododendron 'King's Ride' Ericaceae 149  
00001017 Rhododendron 'King Tut' ((R. smirnowii × R. 'America') × red R. catawbiense seedling)) Rhododendron 'King Tut' Ericaceae 122  
00003427 Rhododendron 'King Tut' ((R. smirnowii × R. 'America') × red R. catawbiense seedling)) Rhododendron 'King Tut' Ericaceae 024  
00001228 Rhododendron kiusianum Mak. Rhododendron Ericaceae 125
00001260 Rhododendron kiusianum Mak. var. alpinum Rhododendron Ericaceae 125
00005446 Rhododendron kiusianum Mak. 'Purpurea' Rhododendron 'Purpurea' Ericaceae 108  
00004278 Rhododendron 'Klondyke' (Knap Hill/Exbury) Rhododendron 'Klondyke' Ericaceae 148
00001701 Rhododendron 'Kluis Sensation' × R. 'Tortoiseshell Orange' Rhododendron 'Kluis Sensation' Ericaceae 108  
00001018 Rhododendron 'Kluis Triumph' (R. griffithianum hybrid) Rhododendron 'Kluis Triumph' Ericaceae 108  
00003018 Rhododendron 'Kokardia' (R. 'Humboldt' × R. 'Direktor E. Hjelm') Rhododendron 'Kokardia' Ericaceae 036
00001685 Rhododendron 'Königstein' (Japanse azalea) Rhododendron 'Königstein' Ericaceae 118  
00004279 Rhododendron 'Koningin Emma' (R. molle hybrid) Rhododendron 'Koningin Emma' Ericaceae 148
00005363 Rhododendron 'Koningin Emma' (R. molle hybrid) Rhododendron 'Koningin Emma' Ericaceae 034
00005382 Rhododendron 'Koster's Brilliant Red' (R. molle hybrid) Rhododendron 'Koster's Brilliant Red' Ericaceae 035
00001283 Rhododendron 'Labe' (Japanse azalea) Rhododendron 'Labe' Ericaceae 118  
00003241 Rhododendron 'La Bostella' (R. 'Nachtglut' × (R. 'Mars' × R. yakushimanum 'Koichiro Wada' )) Rhododendron 'La Bostella' Ericaceae 149  
00003506 Rhododendron 'Lachsgold' (R. wardii hybrid) Rhododendron 'Lachsgold' Ericaceae 139
00003394 Rhododendron 'Lady Armstrong' (R. ponticum hybrid) Rhododendron 'Lady Armstrong' Ericaceae 036
00001696 Rhododendron 'Ladybird' (R. fortunei subsp. discolor × R. 'Corona') † Rhododendron 'Ladybird' Ericaceae ---
00001084 Rhododendron 'Lady Bowes Lyon' (R. Pilgrim Group × R. yakushimanum) Rhododendron 'Lady Bowes Lyon' Ericaceae 121
00009099 Rhododendron 'Lady Longman' (R. 'Cynthia' × R. 'Lady Eleanor Cathcart') Rhododendron 'Lady Longman' Ericaceae 165
00003527 Rhododendron 'Lady Primrose' (R. campylocarpum hybrid) Rhododendron 'Lady Primrose' Ericaceae 139
00005673 Rhododendron 'Lady Roseberry' (Knap Hill/Exbury) Rhododendron 'Lady Roseberry' Ericaceae 108
00003741 Rhododendron 'Laelia' (Harde Gentse) Rhododendron 'Laelia' Ericaceae 105
00001119 Rhododendron 'Lamentosa' (R. 'Humboldt' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Lamentosa' Ericaceae 121
00001122 Rhododendron 'Lampion' (R. 'Bad Eilsen' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Lampion' Ericaceae 121
00003376 Rhododendron 'Lamplighter' (R. 'Britannia' × R. 'Madame Fr. J. Chauvin') Rhododendron 'Lamplighter' Ericaceae 036
00005659 Rhododendron 'Lapwing' (Knap Hill/Exbury) Rhododendron 'Lapwing' Ericaceae 107
00004580 Rhododendron 'La Surprise' (Harde Gentse) Rhododendron 'La Surprise' Ericaceae 150
00003923 Rhododendron 'Lausitz' (R. 'Caractacus' × R. 'Louis Pasteur') Rhododendron 'Lausitz' Ericaceae 105  
00001019 Rhododendron 'Lavender Girl' (R. fortunei × R. 'Lady Grey Egerton') Rhododendron 'Lavender Girl' Ericaceae 108
00003290 Rhododendron 'Lavender Girl' (R. fortunei × R. 'Lady Grey Egerton') Rhododendron 'Lavender Girl' Ericaceae 108
00003503 Rhododendron 'Lee's Dark Purple' (R. catawbiense hybrid) Rhododendron 'Lee's Dark Purple' Ericaceae 139
00004544 Rhododendron 'Lee's Dark Purple' (R. catawbiense hybrid) Rhododendron 'Lee's Dark Purple' Ericaceae 116
00004548 Rhododendron 'Lee's Dark Purple' (R. catawbiense hybrid) Rhododendron 'Lee's Dark Purple' Ericaceae 116
00004547 Rhododendron 'Lee's Dark Purple' (R. catawbiense hybrid) Rhododendron 'Lee's Dark Purple' Ericaceae 116  
00004546 Rhododendron 'Lee's Dark Purple' (R. catawbiense hybrid) Rhododendron 'Lee's Dark Purple' Ericaceae 116
00003386 Rhododendron 'Lee's Scarlet' (R. caucasicum hybrid) Rhododendron 'Lee's Scarlet' Ericaceae 036
00003742 Rhododendron 'Leibuir' (Harde Gentse) Rhododendron 'Leibuir' Ericaceae 102
20080238 Rhododendron 'Lelie Dame' Rhododendron 'Lelie Dame' Ericaceae 149  
00004136 Rhododendron 'Lemonora' (R. molle hybrid) Rhododendron 'Lemonora' Ericaceae 107
20150143 Rhododendron 'Le Titien' (Harde Gentse/Rustica) Rhododendron 'Le Titien' Ericaceae  
00007311 Rhododendron 'Limonade' Rhododendron 'Limonade' Ericaceae 166  
00003434 Rhododendron 'Linda' (R. 'Britannia' × R. williamsianum) Rhododendron 'Linda' Ericaceae 024
20090351 Rhododendron lindleyi T.Moore Rhododendron Ericaceae  
00003438 Rhododendron 'Lissabon' (R. 'Nova Zembla' × R. williamsianum) Rhododendron 'Lissabon' Ericaceae 024
00001354 Rhododendron 'Little White Dove' (R. fortunei × R. yakushimanum) Rhododendron 'Little White Dove' Ericaceae 120
00001246 Rhododendron 'Little White Dove' (R. fortunei × R. yakushimanum) Rhododendron 'Little White Dove' Ericaceae 120
00001032 Rhododendron Lodauric Group (R. Loderi Group × R. auriculatum) Rhododendron Ericaceae 108  
00007422 Rhododendron Loderi Group 'Loderi Pink Diamond' (R. fortunei × R. griffithianum) Rhododendron 'Loderi Pink Diamond' Ericaceae 166
00004549 Rhododendron Loderi Group 'Loderi Venus' (R. fortunei × R. griffithianum) Rhododendron 'Loderi Venus' Ericaceae 108
00001639 Rhododendron 'Lois' (R. wardii hybrid) Rhododendron 'Lois' Ericaceae 135  
00004270 Rhododendron 'Looking Glass' (R. yakushimanum × R. 'China') Rhododendron 'Looking Glass' Ericaceae 150  
00001340 Rhododendron 'Lori Eichelser' (R. forrestii subsp. forrestii × R. Bow Bells Group) Rhododendron 'Lori Eichelser' Ericaceae 136  
00003743 Rhododendron 'Louis Aimé Van Houtte' (Harde Gentse) Rhododendron 'Louis Aimé Van Houtte' Ericaceae 105
20060005 Rhododendron 'Louis Blommaert' (Harde Gentse) Rhododendron 'Louis Blommaert' Ericaceae 176  
00004579 Rhododendron 'Louis Hellebuyck' (Harde Gentse) Rhododendron 'Louis Hellebuyck' Ericaceae 150
00003369 Rhododendron 'Louis Pasteur' (R. 'Mrs Tritton' × R. 'Viscount Powerscourt') † Rhododendron 'Louis Pasteur' Ericaceae ---  
00001623 Rhododendron 'Love Song' (R. 'Vulcan's Flame' × R. yakushimanum) Rhododendron 'Love Song' Ericaceae 117
00001389 Rhododendron 'Love Song' (R. 'Vulcan's Flame' × R. yakushimanum) Rhododendron 'Love Song' Ericaceae 153
00003498 Rhododendron 'Love Song' (R. 'Vulcan's Flame' × R. yakushimanum) † Rhododendron 'Love Song' Ericaceae ---
00007544 Rhododendron 'Loy' (R. wardii hybrid) † Rhododendron 'Loy' Ericaceae ---
00008090 Rhododendron 'Loy' (R. wardii hybr.) Rhododendron 'Loy' Ericaceae 004
00002972 Rhododendron 'Lukas' (R. 'Vulcan' × R. yakushimanum) Rhododendron 'Lukas' Ericaceae 117
00006810 Rhododendron lutescens Franch. Rhododendron Ericaceae 048
00006639 Rhododendron luteum (L.) Sweet Rhododendron 'Umpqua Queen' Ericaceae 048
00004343 Rhododendron luteum (L.) Sweet Rhododendron Ericaceae 166
00004344 Rhododendron luteum (L.) Sweet Rhododendron Ericaceae 166
00004342 Rhododendron luteum (L.) Sweet Rhododendron Ericaceae 166
00006636 Rhododendron luteum (L.) Sweet Rhododendron Ericaceae 048
00003724 Rhododendron aff. luteum (L.) Sweet Rhododendron Ericaceae 105
00004442 Rhododendron 'Luzi' (Japanse azalea) Rhododendron 'Luzi' Ericaceae 118
20150158 Rhododendron 'Luzy' (Japanse azalea) Rhododendron 'Luzy' Ericaceae  
20140039 Rhododendron macabeanum Balf.f. Rhododendron Ericaceae  
20140049 Rhododendron macabeanum Balf.f. Rhododendron Ericaceae 000
00007545 Rhododendron macabeanum Balf.f. Rhododendron Ericaceae 040  
00003020 Rhododendron macabeanum hybrid (R. 'Boule de Neige' × R. macabeanum) Rhododendron Ericaceae 108  
00004539 Rhododendron 'Macrantha' (Japanse azalea) Rhododendron 'Macrantha' Ericaceae 118  
00001291 Rhododendron 'Madame Albert van Hecke' (Japanse azalea) Rhododendron 'Madame Albert van Hecke' Ericaceae 118
00003021 Rhododendron 'Madame de Bruin' (R. 'Prometheus' × R. 'Doncaster') Rhododendron 'Madame de Bruin' Ericaceae 036
00006433 Rhododendron 'Madame Galle' (Japanse azalea) Rhododendron 'Madame Galle' Ericaceae 118  
20080022 Rhododendron 'Madame Gustave Guilmot' (Harde Gentse) Rhododendron 'Madame Gustave Guilmot' Ericaceae 176
00004573 Rhododendron 'Madame Gustave Guilmot' (Harde Gentse) Rhododendron 'Madame Gustave Guilmot' Ericaceae 111
00005543 Rhododendron 'Madame Hardijzer' (Japanse azalea) Rhododendron 'Madame Hardijzer' Ericaceae 118  
00003022 Rhododendron 'Madame Marie Fortie' Rhododendron 'Madame Marie Fortie' Ericaceae 036  
00001022 Rhododendron 'Madame Masson' (R. catawbiense × R. ponticum) Rhododendron 'Madame Masson' Ericaceae 154
20150124 Rhododendron 'Madame Moser' (Harde Gentse) Rhododendron 'Madame Moser' Ericaceae  
00003738 Rhododendron 'Madame Gustave Guilmot' (Harde Gentse) Rhododendron 'Madame Gustave Guilmot' Ericaceae 105
00005658 Rhododendron 'Magnificum' (R. occidentale hybrid) Rhododendron 'Magnificum' Ericaceae 000
00006637 Rhododendron 'Magnificum' (R. occidentale hybrid) Rhododendron 'Magnificum' Ericaceae 161  
00007299 Rhododendron 'Magnificum' (R. occidentale hybrid) Rhododendron 'Magnificum' Ericaceae 161
00001021 Rhododendron 'Maharani' (R. 'Harvest Moon' × R. Letty Edwards Group) Rhododendron 'Maharani' Ericaceae 108
00003516 Rhododendron 'Maharani' (R. 'Harvest Moon' × R. Letty Edwards Group) Rhododendron 'Maharani' Ericaceae 027
00001069 Rhododendron 'Maifreude' (R. yakushimanum × R. 'Britannia') Rhododendron 'Maifreude' Ericaceae 121
00006430 Rhododendron 'Maja' (Harde Gentse) Rhododendron 'Maja' Ericaceae 155
00005068 Rhododendron makinoi Tagg Rhododendron Ericaceae 004  
00005069 Rhododendron makinoi Tagg 'Hosoba' Rhododendron 'Hosoba' Ericaceae 004  
00001612 Rhododendron makinoi Tagg 'Hosoba' Rhododendron 'Hosoba' Ericaceae 117
00009204 Rhododendron makinoi Tagg 'Silber' † Rhododendron 'Silber' Ericaceae ---
00006434 Rhododendron 'Malvaticum' (Japanse azalea) Rhododendron 'Malvaticum' Ericaceae 118  
00003375 Rhododendron 'Marca' (R. 'Caractacus' × R. decorum) Rhododendron 'Marca' Ericaceae 036
00008033 Rhododendron 'Märchenlaub' (R. bureavii × R. wiltonii) Rhododendron 'Märchenlaub' Ericaceae 111
00007546 Rhododendron 'Märchenlaub' (R. bureavii × R. wiltonii) Rhododendron 'Märchenlaub' Ericaceae 050
00005653 Rhododendron 'Marconi' (R. molle hybrid) Rhododendron 'Marconi' Ericaceae 148
00005359 Rhododendron 'Marconi' (R. molle hybrid) Rhododendron 'Marconi' Ericaceae 034
00003924 Rhododendron 'Margreet Deetman' (R. yakushimanum hybrid) Rhododendron 'Margreet Deetman' Ericaceae 150
00003415 Rhododendron 'Margret' (R. smirnowii hybrid) Rhododendron 'Margret' Ericaceae 024
00001064 Rhododendron 'Margret' (R. smirnowii hybrid) Rhododendron 'Margret' Ericaceae 122
00001053 Rhododendron 'Marietta' (R. 'Tosca' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Marietta' Ericaceae 121
00003898 Rhododendron 'Marietta' (R. 'Tosca' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Marietta' Ericaceae 150
00006409 Rhododendron 'Marie Verschaffelt' (Harde Gentse) Rhododendron 'Marie Verschaffelt' Ericaceae 152
00003023 Rhododendron 'Marinus Koster' (R. griffithianum hybrid) Rhododendron 'Marinus Koster' Ericaceae 036
00001392 Rhododendron 'Marion Street' (R. 'Stanley Davis' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Marion Street' Ericaceae 153
00003482 Rhododendron 'Marion Street' (R. 'Stanley Davis' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Marion Street' Ericaceae ---
00004565 Rhododendron 'Marlies' (Knap Hill/Exbury) Rhododendron 'Marlies' Ericaceae 108
00001299 Rhododendron 'Maruschka' (Japanse azalea) Rhododendron 'Maruschka' Ericaceae 118
00006646 Rhododendron 'Mathilda' (R. molle hybrid) Rhododendron 'Mathilda' Ericaceae 048
00007140 Rhododendron 'Mathilde' (Harde Gentse) Rhododendron 'Mathilde' Ericaceae 163
00006583 Rhododendron maximum L. Rhododendron Ericaceae 055  
00001603 Rhododendron maximum L. Rhododendron Ericaceae 108  
00007554 Rhododendron maximum L. hybrid (R. maximum × Kalmia latifolia) Rhododendron Ericaceae 165  
00003024 Rhododendron maximum L. 'Shortoff' Rhododendron 'Shortoff' Ericaceae 108
00004433 Rhododendron 'Maxi Rose' Rhododendron 'Maxi Rose' Ericaceae 108
00004591 Rhododendron 'Mécène' (Harde Gentse/Rustica) Rhododendron 'Mécène' Ericaceae 150
00007448 Rhododendron 'Medway' (Knap Hill/Exbury) Rhododendron 'Medway' Ericaceae 140
00009108 Rhododendron 'Melville' ((R. 'Countess of Derby' x R. 'Loderi Venus') × R. Fabia Group) Rhododendron 'Melville' Ericaceae 015  
00004564 Rhododendron 'Memoir' (R. catawbiense hybrid) Rhododendron 'Memoir' Ericaceae 108
00001140 Rhododendron 'Mephistopheles' (Knap Hill/Exbury) Rhododendron 'Mephistopheles' Ericaceae 107  
00009100 Rhododendron 'Michael Waterer' (R. ponticum hybrid) Rhododendron 'Michael Waterer' Ericaceae 148
00006811 Rhododendron micranthum Turcz. † Rhododendron Ericaceae ---
00001613 Rhododendron 'Mijnheer Oscar Wuyts' (Japanse azalea) Rhododendron 'Mijnheer Oscar Wuyts' Ericaceae 118  
00001040 Rhododendron 'Milano' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Milano' Ericaceae 121
00003997 Rhododendron 'Milano' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Milano' Ericaceae 036  
00005485 Rhododendron 'Milton' (Harde Gentse/Rustica) † Rhododendron 'Milton' Ericaceae ---
00006424 Rhododendron 'Mina Van Houtte' (Harde Gentse) Rhododendron 'Mina Van Houtte' Ericaceae 152
00009086 Rhododendron 'Minerve' (Harde Gentse) Rhododendron 'Minerve' Ericaceae 110
20060006 Rhododendron 'Minerve' (Harde Gentse) Rhododendron 'Minerve' Ericaceae 176  
00003744 Rhododendron 'Miniatum Floribundum' (Harde Gentse) Rhododendron 'Miniatum Floribundum' Ericaceae 105
00001131 Rhododendron 'Minikin' (Knap Hill/Exbury) Rhododendron 'Minikin' Ericaceae 148
00009083 Rhododendron 'Mitsuko' (R. yakushimanum hybrid) Rhododendron 'Mitsuko' Ericaceae 175
00003445 Rhododendron 'Mme. Van Hecke' (Japanse azalea) Rhododendron 'Mme. Van Hecke' Ericaceae 025  
00001289 Rhododendron 'Moederkensdag' (Japanse azalea) Rhododendron 'Moederkensdag' Ericaceae 118  
00004436 Rhododendron 'Moederkensdag' (Japanse azalea) Rhododendron 'Moederkensdag' Ericaceae 118
00001221 Rhododendron 'Moerheim' (R. impeditum hybrid) Rhododendron 'Moerheim' Ericaceae 132  
00003406 Rhododendron 'Moerheim's Pink' (R. williamsianum × R. 'Genoveva') Rhododendron 'Moerheim's Pink' Ericaceae 024  
00007141 Rhododendron 'Moidart' (R. viscosum hybrid) Rhododendron 'Moidart' Ericaceae 164
00005442 Rhododendron 'Monica' (R. forrestii subsp. forrestii × R. 'Doctor H.C. Dresselhuys') Rhododendron 'Monica' Ericaceae 108  
00004267 Rhododendron 'Monsieur Marcel Ménard' Rhododendron 'Monsieur Marcel Ménard' Ericaceae 139  
00003440 Rhododendron 'Moonstone' (R. campylocarpum × R. williamsianum) Rhododendron 'Moonstone' Ericaceae 024  
00001230 Rhododendron 'Moonstone' (R. campylocarpum × R. williamsianum) Rhododendron 'Moonstone' Ericaceae 122  
00001247 Rhododendron 'Mooreule' (R. discolor × R. 'Marie Stuart') Rhododendron 'Mooreule' Ericaceae 103
00006420 Rhododendron 'Moorgold' (Harde Gentse) Rhododendron 'Moorgold' Ericaceae 152
00001278 Rhododendron 'Morava' (Japanse azalea) Rhododendron 'Morava' Ericaceae 118  
00003495 Rhododendron 'Morgenrot' (R. yakushimanum 'Koichiro Wada' × R. 'Spitfire') † Rhododendron 'Morgenrot' Ericaceae ---
00003925 Rhododendron 'Morning Cloud' (R. yakushimanum × R. 'Springbok') Rhododendron 'Morning Cloud' Ericaceae 150
00001601 Rhododendron 'Morning Magic' (R. yakushimanum × R. 'Springbok') Rhododendron 'Morning Magic' Ericaceae 117  
20150151 Rhododendron 'Mother's Day' (Japanse azalea) Rhododendron 'Mother's Day' Ericaceae  
00001248 Rhododendron 'Mountain Marriage' (R. maximum × R. yakushimanum) Rhododendron 'Mountain Marriage' Ericaceae 120
00001357 Rhododendron 'Mountain Marriage' (R. maximum × R. yakushimanum) Rhododendron 'Mountain Marriage' Ericaceae 120
00004664 Rhododendron 'Mount Everest' (Japanse azalea) Rhododendron 'Mount Everest' Ericaceae 118
00001001 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154
00001168 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001169 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001163 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154
00001162 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001167 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001170 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001166 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001165 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154  
00001164 Rhododendron 'Mrs Anthony Waterer' (R. fortunei hybrid) Rhododendron 'Mrs Anthony Waterer' Ericaceae 154
00009097 Rhododendron 'Mrs A.T. de la Mare' (R. 'Sir Charles Butler' × R. 'Halopeanum') Rhododendron 'Mrs A.T. de la Mare' Ericaceae 001
00007423 Rhododendron 'Mrs C.B. Van Nes' (R. 'Princess Juliana' × R. 'Florence Sarah Smith') Rhododendron 'Mrs C.B. Van Nes' Ericaceae 106  
00003373 Rhododendron 'Mrs Charles E. Pearson' (R. Coombe Royal Group × R. catawbiense 'Grandiflorum') Rhododendron 'Mrs Charles E. Pearson' Ericaceae 036
00004266 Rhododendron 'Mrs Charles E. Pearson' (R. Coombe Royal Group × R. catawbiense 'Grandiflorum') Rhododendron 'Mrs Charles E. Pearson' Ericaceae 036
00004405 Rhododendron 'Mrs E.C. Stirling' (R. griffithianum hybrid) Rhododendron 'Mrs E.C. Stirling' Ericaceae 108  
00007425 Rhododendron 'Mrs G.W. Leak' (R. Coombe Royal Group × R. 'Chevalier Felix de Sauvage') Rhododendron 'Mrs G.W. Leak' Ericaceae 106
00004106 Rhododendron 'Mrs Harry White' (Harde Gentse) Rhododendron 'Mrs Harry White' Ericaceae 110
00007450 Rhododendron 'Mrs John Russell' (R. molle hybrid) Rhododendron 'Mrs John Russell' Ericaceae 166
00009104 Rhododendron 'Mrs Lindsay Smith' (R. 'George Hardy' × R. 'Duchess of Edinburgh') Rhododendron 'Mrs Lindsay Smith' Ericaceae 139
00005668 Rhododendron 'Mrs Norman Luff' (R. molle hybrid) Rhododendron 'Mrs Norman Luff' Ericaceae 175  
00005688 Rhododendron 'Mrs Norman Luff' (R. molle hybrid) Rhododendron 'Mrs Norman Luff' Ericaceae 108  
00007424 Rhododendron 'Mrs R.S. Holford' (R. catawbiense hybrid) Rhododendron 'Mrs R.S. Holford' Ericaceae 106
00001202 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154
00005553 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001204 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001203 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001206 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001205 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001020 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154
00001207 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001209 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00001208 Rhododendron 'Mrs T.H. Lowinsky' Rhododendron 'Mrs T.H. Lowinsky' Ericaceae 154  
00009098 Rhododendron 'Mrs W.C. Slocock' (R. campylocarpum hybrid) Rhododendron 'Mrs W.C. Slocock' Ericaceae 165
00006428 Rhododendron 'Murillo' (Harde Gentse/Rustica) Rhododendron 'Murillo' Ericaceae 152
00009110 Rhododendron 'Mustafa' ((R. 'Nova Zembla' × 'Mars') × (R. 'Mars' × R. yakushimanum 'Koichiro Wada' )) Rhododendron 'Mustafa' Ericaceae 174  
00003936 Rhododendron 'Myrtifolium' (R. hirsutum × R. minus) Rhododendron 'Myrtifolium' Ericaceae 107
00009021 Rhododendron 'Nabucco' (Knap Hill/Exbury) † Rhododendron 'Nabucco' Ericaceae ---
00001132 Rhododendron 'Nancy Buchanan' (Knap Hill/Exbury) Rhododendron 'Nancy Buchanan' Ericaceae 148
00001128 Rhododendron 'Nancy Waterer' (Harde Gentse) Rhododendron 'Nancy Waterer' Ericaceae 102
00001024 Rhododendron 'Naomi Astarte' (R. Aurora Group × R. fortunei) Rhododendron 'Naomi Astarte' Ericaceae 108  
00003676 Rhododendron 'Napoli' (R. 'Goldsworth Orange' × ((R. 'Catharina van Tol' × R. discolor) × R. scyphocalyx))) Rhododendron 'Napoli' Ericaceae 149
00006423 Rhododendron 'Narcissiflorum' (Harde Gentse) Rhododendron 'Narcissiflorum' Ericaceae 152
00004586 Rhododendron 'Narcissiflorum' (Harde Gentse) Rhododendron 'Narcissiflorum' Ericaceae 150
00001314 Rhododendron 'Nathalie' (R. Elizabeth Group × R. smirnowii) Rhododendron 'Nathalie' Ericaceae 122
00001539 Rhododendron neoglandulosum Harmaja Rhododendron Ericaceae 135  
00004599 Rhododendron neriiflorum Franch. Rhododendron Ericaceae 036
00003745 Rhododendron 'Neron' (Harde Gentse) Rhododendron 'Neron' Ericaceae 105
00004396 Rhododendron 'Nicholas' (R. ponticum hybrid) Rhododendron 'Nicholas' Ericaceae 108
00005358 Rhododendron 'Nicolaas Beets' (R. molle hybrid) Rhododendron 'Nicolaas Beets' Ericaceae 034
00001680 Rhododendron 'Nicoletta' (R. 'Fantastica' × (R. 'Hachmann's Ornament' × R. 'Furnivall's Daughter')) Rhododendron 'Nicoletta' Ericaceae 117
00009074 Rhododendron 'Niko' (R. yakushimanum hybrid) Rhododendron 'Niko' Ericaceae 175  
00001624 Rhododendron 'Ninotschka' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Ninotschka' Ericaceae 117  
00003746 Rhododendron 'Nivale Striatum' (Harde Gentse) Rhododendron 'Nivale Striatum' Ericaceae 105
00007428 Rhododendron 'Nobleanum Venustum' (R. caucasicum × R. arboreum) Rhododendron 'Nobleanum Venustum' Ericaceae 106  
00001056 Rhododendron 'Nonchalance' (R. 'Goldsworth Orange' × R. 'Mrs. R. S. Holford') Rhododendron 'Nonchalance' Ericaceae 108
00007552 Rhododendron 'Norfolk Candy' (R. 'Milkmaid' × R. 'Marmora') Rhododendron 'Norfolk Candy' Ericaceae 165
00005369 Rhododendron 'Norma' (Harde Gentse/Rustica) Rhododendron 'Norma' Ericaceae 034
00009093 Rhododendron 'Nosegay' (Harde Gentse) Rhododendron 'Nosegay' Ericaceae 174
00003389 Rhododendron 'Nova Zembla' (R. 'Parson's Grandiflorum' × hybrid) Rhododendron 'Nova Zembla' Ericaceae 036  
00003310 Rhododendron 'Oberschlesien' (R. insigne × R. yakushimanum) Rhododendron 'Oberschlesien' Ericaceae 120
00001213 Rhododendron 'Oberschlesien' (R. insigne × R. yakushimanum) Rhododendron 'Oberschlesien' Ericaceae 120
00009045 Rhododendron oblongifolium (Small) Millais Rhododendron Ericaceae 164  
00007360 Rhododendron occidentale A.Gray Rhododendron Ericaceae 036  
00003528 Rhododendron 'Odee Wright' (R. Idealist Group × R. 'Mrs. Betty Robertson') Rhododendron 'Odee Wright' Ericaceae 139
00001074 Rhododendron 'Odessa' (R. Fabia Group × R. smirnowii) Rhododendron 'Odessa' Ericaceae 122  
00003409 Rhododendron 'Odessa' (R. Fabia Group × R. smirnowii) Rhododendron 'Odessa' Ericaceae 024
00001373 Rhododendron 'Odoratum' (R. ponticum × R. periclymenoides) (Azaleodendron) Rhododendron 'Odoratum' Ericaceae 134  
00003254 Rhododendron 'Oktober' (R. 'Fabia' × (R. smirnowii × R. yakushimanum)) Rhododendron 'Oktober' Ericaceae 117
00001060 Rhododendron 'Oldenburg' (R. fortunei subsp. discolor × R. williamsianum) Rhododendron 'Oldenburg' Ericaceae 122  
00003405 Rhododendron 'Oldenburg' (R. fortunei subsp. discolor × R. williamsianum) Rhododendron 'Oldenburg' Ericaceae 024
00007310 Rhododendron 'Orangeade' Rhododendron 'Orangeade' Ericaceae 166  
00004663 Rhododendron 'Orange Beauty' (Japanse azalea) Rhododendron 'Orange Beauty' Ericaceae 118
20150156 Rhododendron 'Orange beauty' (Japanse azalea) Rhododendron 'Orange beauty' Ericaceae  
00007361 Rhododendron orbiculare Decne. Rhododendron Ericaceae 036
00008088 Rhododendron orbiculare Decne. hybrid (R. orbiculare × R. metternianum) † Rhododendron Ericaceae ---
00001608 Rhododendron 'Oregon Queen' (R. macrophyllum × R. occidentale) (Azaleodendron) Rhododendron 'Oregon Queen' Ericaceae 134  
00003747 Rhododendron 'Orpheus' (Harde Gentse) Rhododendron 'Orpheus' Ericaceae 105
00003748 Rhododendron 'Oscar 1' (Harde Gentse) Rhododendron 'Oscar 1' Ericaceae 105
00003363 Rhododendron 'Osmar' (R. williamsianum hybrid) Rhododendron 'Osmar' Ericaceae 122
00001396 Rhododendron 'Osmar' (R. williamsianum hybrid) Rhododendron 'Osmar' Ericaceae 122
00001646 Rhododendron 'Boskoop Ostara' (R. mucronulatum × R. dauricum ?) Rhododendron 'Boskoop Ostara' Ericaceae 131
00009031 Rhododendron 'Oswald de Kerckhove' (R. molle hybrid) Rhododendron 'Oswald de Kerckhove' Ericaceae 175  
00003431 Rhododendron 'Oudijk's Favorite' (R. Intrifast Group × R. augustinii) Rhododendron 'Oudijk's Favorite' Ericaceae 024  
00003436 Rhododendron 'Oudijk's Sensation' (R. 'Essex Scarlet' × R. williamsianum) Rhododendron 'Oudijk's Sensation' Ericaceae 024  
00004395 Rhododendron 'Ovation' (R. 'Mars' × R. haematodes) Rhododendron 'Ovation' Ericaceae 108
00001377 Rhododendron 'Ovatum' (R. hirsutum × R. minus) Rhododendron 'Ovatum' Ericaceae 126  
00003946 Rhododendron 'Overstreet' (R. yakushimanum hybrid) Rhododendron 'Overstreet' Ericaceae 150  
00006816 Rhododendron Oxlip Group (R. williamsianum × R. wardii Litiense Group) Rhododendron Ericaceae 122
00004272 Rhododendron 'Oxydol' (Knap Hill/Exbury) Rhododendron 'Oxydol' Ericaceae 148
00001657 Rhododendron pachysanthum Hayata Rhododendron Ericaceae 040  
00004107 Rhododendron 'Pallas' (Harde Gentse) Rhododendron 'Pallas' Ericaceae 103
20150150 Rhododendron 'Panda' (Japanse azalea) Rhododendron 'Panda' Ericaceae  
00001688 Rhododendron 'Panda' (Japanse azalea) Rhododendron 'Panda' Ericaceae 118
00001698 Rhododendron 'Papageno' (R. 'Nachtglut' × (R. 'Mars' × R. yakushimanum 'Koichiro Wada' )) Rhododendron 'Papageno' Ericaceae 117
00006643 Rhododendron 'Paramount' (Knap Hill/Exbury) Rhododendron 'Paramount' Ericaceae 048
00009003 Rhododendron 'Parkfeuer' Rhododendron 'Parkfeuer' Ericaceae 165
00003926 Rhododendron 'Parsival' (R. yakushimanum hybrid) Rhododendron 'Parsival' Ericaceae 150  
00001107 Rhododendron 'Partyglanz' (R. insigne × R. 'Graf Zeppelin') Rhododendron 'Partyglanz' Ericaceae 109
00001015 Rhododendron 'Partyglanz' (R. insigne × R. 'Graf Zeppelin') Rhododendron 'Partyglanz' Ericaceae 109
00004523 Rhododendron 'Patty Bee' (R. keiskei 'Yaku Flairy' × R. fletcherianum) Rhododendron 'Patty Bee' Ericaceae 108  
00007429 Rhododendron 'Peggy Bannier' (? × R. 'Antoon Van Welie') Rhododendron 'Peggy Bannier' Ericaceae 106
00003381 Rhododendron 'Pelopidas' (R. catawbiense hybrid) Rhododendron 'Pelopidas' Ericaceae 036
00003456 Rhododendron 'Percy Wiseman' (R. yakushimanum × R. 'Fabia Tangerine') † Rhododendron 'Percy Wiseman' Ericaceae ---
00001077 Rhododendron 'Percy Wiseman' (R. yakushimanum × R. 'Fabia Tangerine') Rhododendron 'Percy Wiseman' Ericaceae 121
20060007 Rhododendron 'Perfectum' (Harde Gentse) Rhododendron 'Perfectum' Ericaceae 176  
20080270 Rhododendron periclymenoides (Michx.) Shinners Rhododendron Ericaceae 000  
20150219 Rhododendron periclymenoides Michx. Rhododendron Ericaceae  
00004968 Rhododendron 'Persil' (Knap Hill/Exbury) Rhododendron 'Persil' Ericaceae 108
00005092 Rhododendron 'Peter John Mezitt' † Rhododendron 'Peter John Mezitt' Ericaceae ---
00005370 Rhododendron 'Phébé' (Harde Gentse/Rustica) Rhododendron 'Phébé' Ericaceae 034
00005371 Rhododendron 'Phébé' (Harde Gentse/Rustica) Rhododendron 'Phébé' Ericaceae 034
00004128 Rhododendron 'Phidias' (Harde Gentse/Rustica) Rhododendron 'Phidias' Ericaceae 107
00003027 Rhododendron 'Pick Fire' Rhododendron 'Pick Fire' Ericaceae 036
00007430 Rhododendron 'Pilgrim' (R. fortunei × R. 'Gill's Triumph') Rhododendron 'Pilgrim' Ericaceae 166
00001106 Rhododendron 'Pink Cherub' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Pink Cherub' Ericaceae 153
00009009 Rhododendron 'Pink Delight' (Knap Hill/Exbury) Rhododendron 'Pink Delight' Ericaceae 148
00004555 Rhododendron 'Pink Drift' (R. calostrotum × R. polycladum) Rhododendron 'Pink Drift' Ericaceae 108  
00006606 Rhododendron 'Pink Mimosa' (R. molle hybrid) Rhododendron 'Pink Mimosa' Ericaceae 164
00003368 Rhododendron 'Pink Pearl' (R. 'George Hardy' × R. 'Broughtonii') † Rhododendron 'Pink Pearl' Ericaceae ---
00003397 Rhododendron 'Pink Perfection' Rhododendron 'Pink Perfection' Ericaceae 036  
00001683 Rhododendron 'Pioneer' (R. mucronulatum × R. racemosum) Rhododendron 'Pioneer' Ericaceae 118  
00008000 Rhododendron poluninii Davidian Rhododendron Ericaceae 034  
00009006 Rhododendron 'Pompadour' (Knap Hill/Exbury) Rhododendron 'Pompadour' Ericaceae 009  
00001235 Rhododendron ponticum L. Rhododendron Ericaceae 103
00004560 Rhododendron ponticum L. Rhododendron Ericaceae 108
00007410 Rhododendron ponticum L. Rhododendron Ericaceae 166
00003374 Rhododendron ponticum L. Rhododendron Ericaceae 036
00004558 Rhododendron ponticum L. Rhododendron Ericaceae 108
00004345 Rhododendron ponticum L. 'Cheiranthifolium' Rhododendron 'Cheiranthifolium' Ericaceae 108
00004554 Rhododendron 'Praecox' (R. ciliatum × R. dauricum) † Rhododendron 'Praecox' Ericaceae ---
00005091 Rhododendron 'Praecox' (R. ciliatum × R. dauricum) Rhododendron 'Praecox' Ericaceae 005
20150147 Rhododendron praevernum Hutch. Rhododendron Ericaceae  
00004590 Rhododendron 'Praxitèle' (Harde Gentse/Rustica) Rhododendron 'Praxitèle' Ericaceae 150
00004584 Rhododendron 'Prince Baudouin' (Harde Gentse/Rustica) Rhododendron 'Prince Baudouin' Ericaceae 150
00003029 Rhododendron 'Prince Camille de Rohan' (R. maximum hybrid) Rhododendron 'Prince Camille de Rohan' Ericaceae 036
00003749 Rhododendron 'Prince Henri des Pays Bas' (Harde Gentse) Rhododendron 'Prince Henri des Pays Bas' Ericaceae 105
00005448 Rhododendron 'Princess Anne' (R. keiskei × R. hanceanum) Rhododendron 'Princess Anne' Ericaceae 108  
00001338 Rhododendron 'Princess Anne' (R. keiskei × R. hanceanum) Rhododendron 'Princess Anne' Ericaceae 133  
00004524 Rhododendron 'Princess Anne' (R. keiskei × R. hanceanum) Rhododendron 'Princess Anne' Ericaceae 108  
00004972 Rhododendron 'Princesse Charlotte' (Harde Gentse) Rhododendron 'Princesse Charlotte' Ericaceae 110
20150129 Rhododendron 'Princesse d'Orange (Harde Gentse) Rhododendron 'Princesse d'Orange' Ericaceae  
00001007 Rhododendron 'Princess Mary of Cambridge' (R. catawbiense or R. caucasicum hybrid) Rhododendron 'Princess Mary of Cambridge' Ericaceae 108
00003763 Rhododendron prinophyllum (Small) Millais Rhododendron Ericaceae 036
00003028 Rhododendron prinophyllum (Small) Millais Rhododendron Ericaceae 036
20150224 Rhododendron prinophyllum (Small) Millais Rhododendron Ericaceae  
00009023 Rhododendron 'Prinses Paola' (Knap Hill/Exbury) Rhododendron 'Prinses Paola' Ericaceae 006
00009105 Rhododendron 'Professor J.H. Zaaijer' (R. 'Pink Pearl' × R. 'Langley Park' ?) Rhododendron 'Professor J.H. Zaaijer' Ericaceae 148
00003030 Rhododendron 'Progres' (R. caucasicum hybrid) Rhododendron 'Progres' Ericaceae 036  
00004115 Rhododendron 'Proteus' (Harde Gentse) Rhododendron 'Proteus' Ericaceae 110
00001379 Rhododendron prunifolium (Small) Millais Rhododendron Ericaceae 036  
20150223 Rhododendron prunifolium (Small) Millais Rhododendron Ericaceae  
00007906 Rhododendron 'Pruvis' (R. prunifolium × R. viscosum) Rhododendron 'Pruvis' Ericaceae 036  
00006642 Rhododendron 'Pruvis' (R. prunifolium × R. viscosum) Rhododendron 'Pruvis' Ericaceae 048  
00007914 Rhododendron przewalskii Maxim. Rhododendron Ericaceae 001  
00006882 Rhododendron 'Ptarmigan' (R. leucaspis × R. orthocladum var. microleucum) Rhododendron 'Ptarmigan' Ericaceae 048  
00001341 Rhododendron 'Ptarmigan' (R. leucaspis × R. orthocladum var. microleucum) Rhododendron 'Ptarmigan' Ericaceae 133  
00001689 Rhododendron 'Purperkissen' (Japanse azalea) Rhododendron 'Purperkissen' Ericaceae 118
00003809 Rhododendron 'Purple Splendour' (R. ponticum hybrid) Rhododendron 'Purple Splendour' Ericaceae 139
00009076 Rhododendron 'Pusstafeuer' (R. yakushimanum × R. 'Polar Star') Rhododendron 'Pusstafeuer' Ericaceae 175
00006414 Rhododendron 'Quadricolor' (Harde Gentse) Rhododendron 'Quadricolor' Ericaceae 152
00003258 Rhododendron 'Queen Alice' (R. yakushimanum × R. 'Alice') Rhododendron 'Queen Alice' 149  
00003750 Rhododendron 'Queen of England' (Harde Gentse) Rhododendron 'Queen of England' Ericaceae 103
00009081 Rhododendron 'Queenswood Centenary' (R. arboreum × R. yakushimanum) Rhododendron 'Queenswood Centenary' Ericaceae 175  
20150130 Rhododendron 'Queen Victoria' (Harde Gentse) Rhododendron 'Queen Victoria' Ericaceae  
00003751 Rhododendron 'Quentin Metsys' (Harde Gentse/Rustica) Rhododendron 'Quentin Metsys' Ericaceae 105
00001147 Rhododendron 'Quentin Metsys' (Harde Gentse/Rustica) Rhododendron 'Quentin Metsys' Ericaceae 119
00001394 Rhododendron racemosum Franch. Rhododendron Ericaceae 118
00008894 Rhododendron racemosum Franch. Rhododendron Ericaceae 148  
00001218 Rhododendron racemosum Franch. Rhododendron Ericaceae 128  
00001227 Rhododendron racemosum Franch. 'Apricot Beauty' Rhododendron 'Apricot Beauty' Ericaceae 128  
00001382 Rhododendron racemosum Franch. 'Apricot Beauty' Rhododendron 'Apricot Beauty' Ericaceae 118
00001385 Rhododendron racemosum Franch. × R. trichocladum † Rhododendron Ericaceae ---
00003752 Rhododendron 'Racine' (Harde Gentse/Rustica) Rhododendron 'Racine' Ericaceae 102
00005654 Rhododendron 'Radiant' (R. molle hybrid) Rhododendron 'Radiant' Ericaceae 148
00001636 Rhododendron 'Radistrotum' (R. calostrotum subsp. keleticum Radicans Group × R. calostrotum) Rhododendron 'Radistrotum' Ericaceae 126  
00001374 Rhododendron 'Ramapo' (R. minus Carolinianum Group × R. fastigiatum) Rhododendron 'Ramapo' Ericaceae 132  
00005368 Rhododendron 'Raphaël De Smet' (Harde Gentse) Rhododendron 'Raphaël De Smet' Ericaceae 034  
00009082 Rhododendron 'Raspberry Ripple' (R. yakushimanum × R. 'Pauline') Rhododendron 'Raspberry Ripple' Ericaceae 175  
00001351 Rhododendron 'Red Bird' (Japanse azalea) Rhododendron 'Red Bird' Ericaceae 118  
00004390 Rhododendron 'Red Eye' (R. 'Anah Kruschke' × R. 'Purple Splendour') Rhododendron 'Red Eye' Ericaceae 140  
00003031 Rhododendron 'Red Jack' ((R. 'Wilgens Ruby' × R. May Day Group) × R. forrestii hybrid)) Rhododendron 'Red Jack' Ericaceae 036
00001296 Rhododendron 'Red Pimpernel' (Japanse azalea) Rhododendron 'Red Pimpernel' Ericaceae 118  
00007433 Rhododendron 'Red Riding Hood' (R. griffithianum × R. 'Atrosanguineum') Rhododendron 'Red Riding Hood' Ericaceae 106  
00006523 Rhododendron 'Red Stem' (R. 'Kluis Sensation' × R. 'Tortoiseshell Orange') Rhododendron 'Red Stem' Ericaceae 050  
00003312 Rhododendron 'Redwood' (R. fortunei × R. insigne) Rhododendron 'Redwood' Ericaceae 109
00007142 Rhododendron 'Reine des Rouges' (Harde Gentse) Rhododendron 'Reine des Rouges' Ericaceae 163
00001059 Rhododendron 'Rendezvous' (R. 'Marinus Koster' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Rendezvous' Ericaceae 121
00003471 Rhododendron 'Rendezvous' (R. 'Marinus Koster' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Rendezvous' Ericaceae ---
00009087 Rhododendron 'Renee' (Harde Gentse) Rhododendron 'Renee' Ericaceae 174
00001097 Rhododendron 'Renoir' (R. 'Pauline' × R. yakushimanum) Rhododendron 'Renoir' Ericaceae 153
00006604 Rhododendron 'Replique' (R. viscosum hybrid) Rhododendron 'Replique' Ericaceae 164
00001249 Rhododendron 'Repose' (R. lacteum × R. fortunei subsp. discolor) Rhododendron 'Repose' Ericaceae 103
00003764 Rhododendron reticulatum D.Don † Rhododendron Ericaceae ---
00006610 Rhododendron 'Rêve d'Amour' (R. viscosum hybrid) Rhododendron 'Rêve d'Amour' Ericaceae 164
00001035 Rhododendron rex H.Lév. Rhododendron Ericaceae 108  
00005440 Rhododendron rex H.Lév. subsp. fictolacteum (Balf.f.) D.F.Chamb. Rhododendron Ericaceae 108  
20150148 Rhododendron rex H.Lév. subsp. fictolacteum (Balf.f.) D.F.Chamb. Rhododendron Ericaceae  
00005677 Rhododendron 'Rexima' (R. yakushimanum 'Hanano-ego' × R. rex) Rhododendron 'Rexima' Ericaceae 111  
20150146 Rhododendron rex H.Lév. subsp. rex Rhododendron Ericaceae  
00001334 Rhododendron 'Ria Hardijzer' (R. racemosum × R. 'Hinodegiri') Rhododendron 'Ria Hardijzer' Ericaceae 126
00004593 Rhododendron 'Ribera' (Harde Gentse/Rustica) Rhododendron 'Ribera' Ericaceae 150
00004118 Rhododendron 'Richardissimum' (Harde Gentse) Rhododendron 'Richardissimum' Ericaceae 110
00004110 Rhododendron 'Richardissimum' (Harde Gentse) Rhododendron 'Richardissimum' Ericaceae 110
00005481 Rhododendron 'Ring of Fire' (R. 'Darigold' × R. Idealist Group) † Rhododendron 'Ring of Fire' Ericaceae ---
00001654 Rhododendron 'Ring of Fire' (R. 'Darigold' × R. Idealist Group) Rhododendron 'Ring of Fire' Ericaceae 040  
00007918 Rhododendron rirei Hemsl. & E.H.Wilson Rhododendron Ericaceae 002  
00001226 Rhododendron 'Robert Seleger' (R. calostrotum subsp. keleticum hybrid) Rhododendron 'Robert Seleger' Ericaceae 125
00004263 Rhododendron 'Rocket' ((R. 'Cunningham's White' × (R. catawbiense × ?)) Rhododendron 'Rocket' Ericaceae 036
00001043 Rhododendron 'Rödhatte' (R. sanguineum subsp. didymum × R. williamsianum) Rhododendron 'Rödhatte' Ericaceae 122  
20120094 Rhododendron 'Roehr's Peggy Ann' (? × R. kaempferi) Rhododendron 'Roehr's Peggy Ann' Ericaceae  
00006250 Rhododendron 'Roi des Belges' (Harde Gentse) Rhododendron 'Roi des Belges' Ericaceae 155
20080023 Rhododendron 'Roi des Feux' (Harde Gentse) Rhododendron 'Roi des Feux' Ericaceae 176
00001298 Rhododendron 'Rokoko' (Japanse azalea) Rhododendron 'Rokoko' Ericaceae 118
00003410 Rhododendron 'Rosa Ballerina' (R. smirnowii × hybrid) Rhododendron 'Rosa Ballerina' Ericaceae 024  
00001302 Rhododendron 'Rosalind' (Japanse azalea) Rhododendron 'Rosalind' Ericaceae 118
00003390 Rhododendron 'Rosamundi' (R. caucasicum hybrid) † Rhododendron 'Rosamundi' Ericaceae ---
00001614 Rhododendron 'Rosa Perle' (R. 'Kluis Triumpf' × R. makinoi) Rhododendron 'Rosa Perle' Ericaceae 117
00006607 Rhododendron 'Rosata' (R. viscosum hybrid) Rhododendron 'Rosata' Ericaceae 164
00007547 Rhododendron 'Rosa Wunder' (R. China Group × R. 'Bremen') Rhododendron 'Rosa Wunder' Ericaceae 165
20150126 Rhododendron 'Rosea Lineata' (Harde Gentse) Rhododendron 'Rosea Lineata' Ericaceae  
00001306 Rhododendron 'Rosebud' (Japanse azalea) Rhododendron 'Rosebud' Ericaceae 118
20080024 Rhododendron 'Rose de Flandre' (Harde Gentse) Rhododendron 'Rose de Flandre' Ericaceae 176
20150154 Rhododendron 'Rose King' (Japanse azalea) Rhododendron 'Rose King' Ericaceae  
00006422 Rhododendron 'Rose Marie' (Harde Gentse) Rhododendron 'Rose Marie' Ericaceae 152
20150128 Rhododendron 'Rosetta' (Harde Gentse) Rhododendron 'Rosetta' Ericaceae  
00009040 Rhododendron 'Roseum' (R. occidentale hybrid) Rhododendron 'Roseum' Ericaceae 160  
00003362 Rhododendron 'Rothenburg' (R. 'Diane' × R. williamsianum) Rhododendron 'Rothenburg' Ericaceae 122
00004109 Rhododendron 'Rouge Brique' (Harde Gentse) Rhododendron 'Rouge Brique' Ericaceae 110
00005439 Rhododendron roxieanum Forrest Rhododendron Ericaceae 108  
00009127 Rhododendron roxieanum Forrest var. cucullatum (Hand.-Mazz.) Chamberl. Rhododendron Ericaceae 035  
00002995 Rhododendron roxieanum Forrest var. oreonastes (Balf.f. & Forrest) hort. (Oreonastes Group) Rhododendron Ericaceae 108  
00004131 Rhododendron 'Royal Command' (Knap Hill/Exbury) Rhododendron 'Royal Command' Ericaceae 107
00001136 Rhododendron 'Royal Command' (Knap Hill/Exbury) † Rhododendron 'Royal Command' Ericaceae ---
00001156 Rhododendron 'Royal Command' (Knap Hill/Exbury) Rhododendron 'Royal Command' Ericaceae 148
00007451 Rhododendron 'Royal Lodge' (Knap Hill/Exbury) Rhododendron 'Royal Lodge' Ericaceae 166
00001694 Rhododendron 'Royal Pink' (R. 'Homer' × R. williamsianum) Rhododendron 'Royal Pink' Ericaceae 122  
00001690 Rhododendron 'Royal Pink' (Japanse azalea) Rhododendron 'Royal Pink' Ericaceae 118  
00004440 Rhododendron 'Roza' (Japanse azalea) Rhododendron 'Roza' Ericaceae 118  
20150125 Rhododendron 'Rubens' (Harde Gentse/Rustica) Rhododendron 'Rubens' Ericaceae  
00001399 Rhododendron rubiginosum Franch. Rhododendron Ericaceae 125
00007105 Rhododendron rubiginosum Franch. Var. Rubiginosum Desquamatum Group Rhododendron Ericaceae 054
00001292 Rhododendron 'Rubinetta' (Japanse azalea) Rhododendron 'Rubinetta' Ericaceae 118  
00001277 Rhododendron 'Rubinstern' (Japanse azalea) Rhododendron 'Rubinstern' Ericaceae 118  
00004575 Rhododendron 'Rubrum Splendissimum' (Harde Gentse) Rhododendron 'Rubrum Splendissimum' Ericaceae 111
00001325 Rhododendron 'Rumpelstilzchen' (R. yakushimanum × R. dichroanthum) Rhododendron 'Rumpelstilzchen' Ericaceae 120
00001215 Rhododendron 'Russautinii' (R. russatum × R. augustinii) Rhododendron 'Russautinii' Ericaceae 129  
00004556 Rhododendron 'Russautinii' (R. russatum × R. augustinii) Rhododendron 'Russautinii' Ericaceae 108  
00001027 Rhododendron 'Rutgers' × R. viscidifolium Rhododendron 'Rutgers' Ericaceae 108  
00009016 Rhododendron 'Sahara' (Knap Hill/Exbury) Rhododendron 'Sahara' Ericaceae 010
00001144 Rhododendron 'Samuel Taylor Coleridge' (R. molle hybrid) Rhododendron 'Samuel Taylor Coleridge' Ericaceae 119
00006247 Rhododendron 'Sang de Gentbrugge' (Harde Gentse) Rhododendron 'Sang de Gentbrugge' Ericaceae 155
00003928 Rhododendron 'Santana' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Santana' Ericaceae 150
00001316 Rhododendron 'Sascha' (R. smirnowii × R. Elizabeth Group) Rhododendron 'Sascha' Ericaceae 122
00004273 Rhododendron 'Satan' (Knap Hill/Exbury) Rhododendron 'Satan' Ericaceae 148
00001280 Rhododendron 'Satschiko' (Japanse azalea) Rhododendron 'Satschiko' Ericaceae 118
00004275 Rhododendron 'Saturnus' (R. molle hybrid) Rhododendron 'Saturnus' Ericaceae 148
00009078 Rhododendron 'Sayaki' (R. yakushimanum hybrid) Rhododendron 'Sayaki' Ericaceae 175  
00007108 Rhododendron scabrifolium Franch. Rhododendron Ericaceae 054
20150136 Rhododendron 'Scarlatti' (Knap Hill/Exbury) Rhododendron 'Scarlatti' Ericaceae  
00001095 Rhododendron 'Schlaraffia' (R. yakushimanum × R. smirnowii) Rhododendron 'Schlaraffia' Ericaceae 120
00004553 Rhododendron schlippenbachii Maxim. Rhododendron Ericaceae 108  
00001360 Rhododendron schlippenbachii Maxim. Rhododendron Ericaceae 036
00004561 Rhododendron 'Schneebukett' (R. 'Mrs J.G. Millais' × R. 'Bismarck') Rhododendron 'Schneebukett' Ericaceae 108
00009024 Rhododendron 'Schneegold' (Knap Hill/Exbury) Rhododendron 'Schneegold' Ericaceae 165
00005456 Rhododendron 'Schneekoppe' (R. minus var. minus × R. ciliatum) Rhododendron 'Schneekoppe' Ericaceae 108  
00001617 Rhododendron 'Schneewolke' (R. 'Mrs J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Schneewolke' Ericaceae 117
00003491 Rhododendron 'Schneewolke' (R. 'Mrs J.G. Millais' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Schneewolke' Ericaceae ---
00001615 Rhododendron 'Schneverdingen' (R. yakushimanum × R. smirnowii) Rhododendron 'Schneverdingen' Ericaceae 117
00003474 Rhododendron 'Schneverdingen' (R. yakushimanum × R. smirnowii) † Rhododendron 'Schneverdingen' Ericaceae ---
00006435 Rhododendron 'Schwanensee' (R. 'Mrs J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Schwanensee' Ericaceae 150
00003243 Rhododendron 'Schwanensee' (R. 'Mrs J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Schwanensee' Ericaceae 149
00003929 Rhododendron 'Schwanensee' (R. 'Mrs J.G. Millais' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Schwanensee' Ericaceae 150
00001102 Rhododendron 'Schwefelblume' (R. yakushimanum hybrid) Rhododendron 'Schwefelblume' Ericaceae 121
00007543 Rhododendron 'Seleger Glocke' (R. wardii hybrid) Rhododendron 'Seleger Glocke' Ericaceae 122  
00004980 Rhododendron 'Semiramis' (Harde Gentse) Rhododendron 'Semiramis' Ericaceae 149  
00001101 Rhododendron 'Seraphine' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') Rhododendron 'Seraphine' Ericaceae 121  
00003472 Rhododendron 'Seraphine' (R. yakushimanum 'Koichiro Wada' × R. 'Cynthia') † Rhododendron 'Seraphine' Ericaceae ---
00003754 Rhododendron 'Sesostris' (Harde Gentse) Rhododendron 'Sesostris' Ericaceae 105
00001600 Rhododendron 'Seven Stars' (R. 'Loderi Sir Joseph Hooker' × R. yakushimanum) Rhododendron 'Seven Stars' Ericaceae 117
00001331 Rhododendron 'Shrimp Girl' (R. yakushimanum × R. 'Fabia Tangerine') Rhododendron 'Shrimp Girl' Ericaceae 153
00001294 Rhododendron 'Signalglühen' (Japanse azalea) Rhododendron 'Signalglühen' Ericaceae 118  
00003677 Rhododendron 'Silberfee' (R. 'Mrs Lindsay Smith' × R. yakushimanum 'Hanano-ego') Rhododendron 'Silberfee' Ericaceae 149
00003288 Rhododendron 'Silberglanz' (R. 'Humboldt' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Silberglanz' Ericaceae 117
00004394 Rhododendron 'Silberreif' (R. catawbiense 'Grandiflorum' Sport) Rhododendron 'Silberreif' Ericaceae 108
00001067 Rhododendron 'Silberwolke' (R. yakushimanum 'Koichiro Wada' × R. 'Album Novum') Rhododendron 'Silberwolke' Ericaceae 121
00003365 Rhododendron 'Silberwolke' (R. yakushimanum 'Koichiro Wada' × R. 'Album Novum') Rhododendron 'Silberwolke' Ericaceae 036  
00001618 Rhododendron 'Silberwolke' (R. yakushimanum 'Koichiro Wada' × R. 'Album Novum') Rhododendron 'Silberwolke' Ericaceae 117
00003489 Rhododendron 'Silberwolke' (R. yakushimanum 'Koichiro Wada' × R. 'Album Novum') † Rhododendron 'Silberwolke' Ericaceae ---
00003477 Rhododendron 'Silberwolke' (R. yakushimanum 'Koichiro Wada' × R. 'Album Novum') † Rhododendron 'Silberwolke' Ericaceae ---
00001697 Rhododendron 'Silver Lady' (R. yakushimanum × R. smirnowii) Rhododendron 'Silver Lady' Ericaceae 111
00003359 Rhododendron 'Silver Lady' (R. yakushimanum × R. smirnowii) Rhododendron 'Silver Lady' Ericaceae 120
00001078 Rhododendron 'Cultivar' (R. yakushimanum hybrid) Rhododendron 'Cultivar' Ericaceae 121
00004969 Rhododendron 'Silver Slipper' (Knap Hill/Exbury) Rhododendron 'Silver Slipper' Ericaceae 108  
00001126 Rhododendron 'Silvetta' (R. 'Humboldt' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Silvetta' Ericaceae 121
00003401 Rhododendron 'Simona' (R. 'Harvest Moon' × R. Letty Edwards Group) Rhododendron 'Simona' Ericaceae 036
20140042 Rhododendron sinofalconeri Balf.f. Rhododendron Ericaceae 000
20120208 Rhododendron sinofalconeri Balf.f. Rhododendron Ericaceae
00001250 Rhododendron 'Sir Charles Butler' (R. fortunei hybrid ?) Rhododendron 'Sir Charles Butler' Ericaceae 103
00001653 Rhododendron 'Sir Charles Lemon' (R. arboreum subsp. cinnamomeum × R. campanulatum) Rhododendron 'Sir Charles Lemon' Ericaceae 040  
00003256 Rhododendron smirnowii Trautv. 'Glanz' Rhododendron 'Glanz' Ericaceae 122
00003448 Rhododendron 'Sneezy' (R. yakushimanum × R. 'Doncaster') † Rhododendron 'Sneezy' Ericaceae ---
00001061 Rhododendron 'Sneezy' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Sneezy' Ericaceae 153
00001148 Rhododendron 'Sneezy' (R. yakushimanum × R. 'Doncaster') Rhododendron 'Sneezy' Ericaceae 153
00009166 Rhododendron 'Snow Lady' (R. leucaspis × R. ciliatum ?) Rhododendron 'Snow Lady' Ericaceae 050
00005676 Rhododendron 'Snow Lady' (R. leucaspis × R. ciliatum ?) Rhododendron 'Snow Lady' Ericaceae 108
00006608 Rhododendron 'Soir de Paris' (R. viscosum hybrid) Rhododendron 'Soir de Paris' Ericaceae 164
00004269 Rhododendron 'Solidarity' (R. yakushimanum × R. 'The Honourable Jean Marie de Montague') Rhododendron 'Solidarity' Ericaceae 108
00001028 Rhododendron 'Sonata' (R. 'Purple Splendour' × R. dichroanthum) Rhododendron 'Sonata' Ericaceae 108  
00001625 Rhododendron 'Sonatine' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Sonatine' Ericaceae 117
00003470 Rhododendron 'Sonatine' (R. 'Mars' × R. yakushimanum 'Koichiro Wada') † Rhododendron 'Sonatine' Ericaceae ---
00005360 Rhododendron 'Sonia' (Knap Hill/Exbury) Rhododendron 'Sonia' Ericaceae 034
00004540 Rhododendron 'Sophie Scholl' (Japanse azalea) † Rhododendron 'Sophie Scholl' Ericaceae ---
00004401 Rhododendron 'Soulkew' hybrid (R. 'Soulkew' × R. 'Germania') Rhododendron 'Soulkew' Ericaceae 140
00003611 Rhododendron 'Souvenir de Doctor S. Endtz' (R. 'Pink Pearl' × R. 'John Walter') † Rhododendron 'Souvenir de Doctor S. Endtz' Ericaceae ---
00003614 Rhododendron 'Souvenir de Dominique Vervaene' † Rhododendron 'Souvenir de Dominique Vervaene' Ericaceae ---
00004577 Rhododendron 'Souvenir du Président Carnot' (Harde Gentse) Rhododendron 'Souvenir du Président Carnot' Ericaceae 150
00006427 Rhododendron 'Souvenir du Président Carnot' (Harde Gentse) Rhododendron 'Souvenir du Président Carnot' Ericaceae 152
00009106 Rhododendron 'Spitfire' (R. griffithianum × ?) Rhododendron 'Spitfire' Ericaceae 148
20150127 Rhododendron 'Splendens' (Harde Gentse) Rhododendron 'Splendens' Ericaceae  
00001682 Rhododendron 'Squirrel' (Japanse azalea) Rhododendron 'Squirrel' Ericaceae 118  
00003504 Rhododendron 'Stadt Delmenhorst' (R. Berryrose Group × R. wardii) Rhododendron 'Stadt Delmenhorst' Ericaceae 139
00003439 Rhododendron 'Stadt Essen' (R. 'Louis Pasteur' × R. williamsianum) Rhododendron 'Stadt Essen' Ericaceae 024  
00001326 Rhododendron 'Stadt Essen Sister' (R. 'Louis Pasteur' × R. williamsianum) Rhododendron 'Stadt Essen Sister' Ericaceae 122  
20150142 Rhododendron 'Standishi' (Harde Gentse) Rhododendron 'Standishi' Ericaceae  
00009103 Rhododendron 'Stanley Davies' Rhododendron 'Stanley Davies' Ericaceae 139
00003383 Rhododendron 'Stella' (R. catawbiense hybrid) Rhododendron 'Stella' Ericaceae 036
00001275 Rhododendron 'Stewartstownian' (Japanse azalea) Rhododendron 'Stewartstownian' Ericaceae 118  
00001071 Rhododendron 'Stockholm' (R. williamsianum hybrid) Rhododendron 'Stockholm' Ericaceae 122
00006633 Rhododendron 'Strawberry Ice' (Knap Hill/Exbury) Rhododendron 'Strawberry Ice' Ericaceae 049
00003931 Rhododendron 'Streatley' (R. aberconwayi × R. yakushimanum) Rhododendron 'Streatley' Ericaceae 111
00004105 Rhododendron 'Sully' (Harde Gentse) Rhododendron 'Sully' Ericaceae 102
00009041 Rhododendron 'Summer Fragrance' (R. occidentale hybrid) Rhododendron 'Summer Fragrance' Ericaceae 160
00004385 Rhododendron 'Sun Chariot' (Knap Hill/Exbury) Rhododendron 'Sun Chariot' Ericaceae 108
00004976 Rhododendron 'Sunrise' (Harde Gentse) Rhododendron 'Sunrise' Ericaceae 149
00004384 Rhododendron 'Sunte Nectarine' (Knap Hill/Exbury) Rhododendron 'Sunte Nectarine' Ericaceae 108
00004595 Rhododendron 'Sunte Nectarine' (Knap Hill/Exbury) Rhododendron 'Sunte Nectarine' Ericaceae 108
00007300 Rhododendron 'Superbum' (R. occidentale hybrid) Rhododendron 'Superbum' Ericaceae 161
00003453 Rhododendron 'Surrey Heath' ((R. facetum hybrid × R. Fabia Group) × (R. yakushimanum × R. 'Britannia')) † Rhododendron 'Surrey Heath' Ericaceae ---
00001082 Rhododendron 'Surrey Heath' ((R. facetum hybrid × R. Fabia Group) × (R. yakushimanum × R. 'Britannia')) Rhododendron 'Surrey Heath' Ericaceae 153
00001029 Rhododendron 'Susan' (R. campanulatum × R. fortunei) Rhododendron 'Susan' Ericaceae 108  
00004346 Rhododendron sutchuenense Franch. Rhododendron Ericaceae 108  
00004277 Rhododendron 'Sylphides' (R. molle hybrid) Rhododendron 'Sylphides' Ericaceae 148
00004437 Rhododendron 'Sylvester' (Japanse azalea) Rhododendron 'Sylvester' Ericaceae 118  
00003900 Rhododendron 'Tatjana' ((R. 'Nova Zembla' × R. 'Mars') × (R. 'Mars' × R. yakushimanum 'Koichiro Wada' )) Rhododendron 'Tatjana' Ericaceae 150  
00001263 Rhododendron 'Teddy Bear' (R. bureavii 'Lem' × R. yakushimanum) Rhododendron 'Teddy Bear' Ericaceae 120
00007308 Rhododendron 'Tender Heart' (Knap Hill/Exbury) Rhododendron 'Tender Heart' Ericaceae 048
00006253 Rhododendron 'Teniers' (Harde Gentse/Rustica) Rhododendron 'Teniers' Ericaceae 155
00003378 Rhododendron 'The Honourable Jean Marie de Montague' (R. griffithianum hybrid) Rhododendron 'The Honourable Jean Marie de Montague' Ericaceae 036  
20150123 Rhododendron 'Thisbe' (Harde Gentse) Rhododendron 'Thisbe' Ericaceae  
00001643 Rhododendron 'Thor' (R. haematodes × R. Felis Group) † Rhododendron 'Thor' Ericaceae ---
00003364 Rhododendron 'Tibet' (R. 'Bismarck' × R. williamsianum) Rhododendron 'Tibet' Ericaceae 122
00001149 Rhododendron 'Tina Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Tina Heinje' Ericaceae 121
00003475 Rhododendron 'Tina Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') † Rhododendron 'Tina Heinje' Ericaceae ---
00001092 Rhododendron 'Tina Heinje' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Tina Heinje' Ericaceae 121  
00001057 Rhododendron 'Titian Beauty' ((R. facetum × R. 'Fabia Tangerine') × (R. yakushimanum × R. 'Fabia Tangerine')) Rhododendron 'Titian Beauty' Ericaceae 121
00003493 Rhododendron 'Titian Beauty' ((R. facetum × R. 'Fabia Tangerine') × (R. yakushimanum × R. 'Fabia Tangerine')) † Rhododendron 'Titian Beauty' Ericaceae ---
00009033 Rhododendron 'T. J. Seidel' (R. molle hybrid) Rhododendron 'T. J. Seidel' Ericaceae 175  
00001537 Rhododendron tolmachevii Harmaja Rhododendron Ericaceae 135  
00000448 Rhododendron tomentosum Harmaja Rhododendron Ericaceae 135  
00001536 Rhododendron tomentosum Harmaja Rhododendron Ericaceae 135  
20150160 Rhododendron 'Toreador' (Japanse azalea) Rhododendron 'Toreador' Ericaceae  
00001287 Rhododendron 'Toreador' (Japanse azalea) Rhododendron 'Toreador' Ericaceae 118  
00001293 Rhododendron 'Tornella' (Japanse azalea) Rhododendron 'Tornella' Ericaceae 118
00004521 Rhododendron Tortoiseshell Group 'Tortoiseshell Orange' (R. 'Goldsworth Orange' × R. griersonianum) Rhododendron 'Tortoiseshell Orange' Ericaceae 108  
00006609 Rhododendron 'Totally Awesome' Rhododendron 'Totally Awesome' Ericaceae 164  
00001127 Rhododendron 'Toucan' (Knap Hill/Exbury) † Rhododendron 'Toucan' Ericaceae ---
00006417 Rhododendron 'Tower Dexter' (R. atlanticum hybrid) Rhododendron 'Tower Dexter' Ericaceae 148
00006418 Rhododendron 'Tower Dragon' (R. atlanticum hybrid) Rhododendron 'Tower Dragon' Ericaceae 148
00001089 Rhododendron 'Träumerei' (R. yakushimanum 'Koichiro Wada' × R. 'Kluis Sensation') Rhododendron 'Träumerei' Ericaceae 121
00001681 Rhododendron 'Tromba' (R. 'Gartendirektor Gloker' × R. 'Burketta') Rhododendron 'Tromba' Ericaceae 122
00009129 Rhododendron 'Trompenburg' (R. wardii hybrid) Rhododendron 'Trompenburg' Ericaceae 004  
00007452 Rhododendron 'Tunis' (Knap Hill/Exbury) † Rhododendron 'Tunis' Ericaceae ---
00003932 Rhododendron 'Turandot' (R.yakushimanum × R.'Mars') Rhododendron 'Turandot' Ericaceae 150
00009010 Rhododendron 'Tyrol' (Knap Hill/Exbury) Rhododendron 'Tyrol' Ericaceae 165
00003526 Rhododendron 'Unique' (R. campylocarpum hybrid) Rhododendron 'Unique' Ericaceae 027
00007434 Rhododendron 'Unknown Warrior' (R. 'Queen Wilhelmina' × R. 'Stanley Davis') Rhododendron 'Unknown Warrior' Ericaceae 106  
00006579 Rhododendron uvarifolium Diels Rhododendron Ericaceae 048  
20150139 Rhododendron 'Van Dyck' (Harde Gentse) Rhododendron 'Van Dyck' Ericaceae  
00007312 Rhododendron 'Van Houttei Flore Pleno' (Harde Gentse) Rhododendron 'Van Houttei Flore Pleno' Ericaceae 163
20080239 Rhododendron 'Van Houttei Flore Pleno' (Harde Gentse) Rhododendron 'Van Houttei Flore Pleno' Ericaceae 000  
00004967 Rhododendron 'Van Houttei Flore Pleno' (Harde Gentse) Rhododendron 'Van Houttei Flore Pleno' Ericaceae 105
00003396 Rhododendron 'Van Weerden Poelman' (R. 'Charles Dickens' × R. 'Lord Roberts') Rhododendron 'Van Weerden Poelman' Ericaceae 036  
00001363 Rhododendron vaseyi A.Gray Rhododendron Ericaceae 036
00001361 Rhododendron vaseyi A.Gray Rhododendron Ericaceae 036
00001362 Rhododendron vaseyi A.Gray Rhododendron Ericaceae 036
00001070 Rhododendron 'Vater Böhlje' (R. catawbiense var. compactum × R. williamsianum) Rhododendron 'Vater Böhlje' Ericaceae 122  
00006431 Rhododendron 'Velasquez' (Harde Gentse/Rustica) Rhododendron 'Velasquez' Ericaceae 152
00003933 Rhododendron 'Venetian Chimes' ((R. facetum hybrid × R. Fabia Group) × (R. yakushimanum × 'Britannia')) Rhododendron 'Venetian Chimes' Ericaceae 150
00003756 Rhododendron 'Versicolor' (Harde Gentse) Rhododendron 'Versicolor' Ericaceae 105
20060008 Rhododendron 'Victoria' (Harde Gentse) Rhododendron 'Victoria' Ericaceae 176  
00003934 Rhododendron 'Vintage Rose' (R. yakushimanum × (R. 'Jalisco Eclipse' × R. Fuselier Group)) Rhododendron 'Vintage Rose' Ericaceae 150
00004588 Rhododendron 'Virgile' (Harde Gentse/Rustica) Rhododendron 'Virgile' Ericaceae 111
00003808 Rhododendron 'Virginia Richards' ((R. wardii × R. F.C. Puddle Group) × R. 'Mrs Betty Robertson') † Rhododendron 'Virginia Richards' Ericaceae ---
00007143 Rhododendron 'Viscosepalum' (Harde Gentse) Rhododendron 'Viscosepalum' Ericaceae 163
20150218 Rhododendron viscosum (L.) Torr. Rhododendron Ericaceae  
00003675 Rhododendron viscosum (L.) Torr. Rhododendron Ericaceae 164
20060009 Rhododendron viscosum (L.) Torr. Rhododendron Ericaceae PKK  
00007905 Rhododendron viscosum (L.) Torr. Rhododendron Ericaceae 036  
00001030 Rhododendron 'Viscy' (R. 'Diane' × R. viscidifolium) Rhododendron 'Viscy' Ericaceae 108  
00003247 Rhododendron Volker Group (R. wardii × R. yakushimanum 'Koichiro Wada') Rhododendron Ericaceae 149  
00005355 Rhododendron 'Von Gneist' (R. molle hybrid) Rhododendron 'Von Gneist' Ericaceae 034
00004403 Rhododendron 'Vulcan' (R. 'Mars' × R. griersonianum) Rhododendron 'Vulcan' Ericaceae 140
00003757 Rhododendron 'Vulcan' (Harde Gentse) Rhododendron 'Vulcan' Ericaceae 105
00001297 Rhododendron 'Vuyk's Scarlet' (Japanse azalea) Rhododendron 'Vuyk's Scarlet' Ericaceae 118
00003766 Rhododendron wadanum Mak. † Rhododendron Ericaceae ---
00006618 Rhododendron wallichii Hook.f. Rhododendron Ericaceae 048
00003380 Rhododendron 'Walloper' (R. 'Anna' × R. 'Marinus Koster') Rhododendron 'Walloper' Ericaceae 036
00005443 Rhododendron wardii W.W.Sm. 'Spät' Rhododendron 'Spät' Ericaceae 108
00005675 Rhododendron 'Washington State Centennial' ((R. occidentale × R. cumberlandenseà × R. 'Santiam')) Rhododendron 'Washington State Centennial' Ericaceae 108
00007917 Rhododendron wasonii Hemsl. & E.H.Wilson Rhododendron Ericaceae 002
00004522 Rhododendron 'Wee Bee' (R. campylogynum 'Patricia' × R. keiskei 'Yaku Fairy') Rhododendron 'Wee Bee' Ericaceae 108  
00003286 Rhododendron 'Wee Bee' (R. campylogynum 'Patricia' × R. keiskei 'Yaku Fairy') Rhododendron 'Wee Bee' Ericaceae 136
00001319 Rhododendron Wega Group (R. 'Sir Charles Butler' × R. williamsianum) Rhododendron Ericaceae 122
00003255 Rhododendron 'Weinlese' ((R. Fabia Group × R. smirnowii) × R. smirnowii) Rhododendron 'Weinlese' Ericaceae 122
00006522 Rhododendron 'Weisser Riese' (R. 'Inamorata' × R. 'Nymphenburg') Rhododendron 'Weisser Riese' Ericaceae 052  
00009132 Rhododendron 'White Chocolate' Rhododendron 'White Chocolate' Ericaceae 004  
20140003 Rhododendron 'White Lady' (Japanse azalea) Rhododendron 'White Lady' Ericaceae 014  
00004439 Rhododendron 'White Lady' (Japanse azalea) Rhododendron 'White Lady' Ericaceae 118  
00001634 Rhododendron 'White Lights' (R. prinophyllum hybrid) Rhododendron 'White Lights' Ericaceae 108
00004271 Rhododendron 'Whitethroat' (Knap Hill/Exbury) Rhododendron 'Whitethroat' Ericaceae 148
00001068 Rhododendron 'Wiero' (R. yakushimanum hybrid) Rhododendron 'Wiero' Ericaceae 121  
00001641 Rhododendron 'Wigeon' (R. minus var minus × R. calostrotum subsp. calostrotum 'Gigha') Rhododendron 'Wigeon' Ericaceae 125
00003393 Rhododendron 'Wilgen's Ruby' (R. 'Britannia' × R. 'John Walter') Rhododendron 'Wilgen's Ruby' Ericaceae 036  
00001073 Rhododendron 'Wilgen's Surprise' (R. 'Wilgen's Ruby' × R. williamsianum) Rhododendron 'Wilgen's Surprise' Ericaceae 122
00003758 Rhododendron 'Wilhelmine' (Harde Gentse) Rhododendron 'Wilhelmine' Ericaceae 102
00003433 Rhododendron 'Willbrit' (R. 'Britannia' × R. williamsianum) Rhododendron 'Willbrit' Ericaceae 024  
00009030 Rhododendron 'Willem Hardijzer' (R. molle hybrid) Rhododendron 'Willem Hardijzer' Ericaceae 175  
00005367 Rhododendron 'Willem III' (Harde Gentse) Rhododendron 'Willem III' Ericaceae 034  
00001359 Rhododendron williamsianum Rehder & E.H.Wilson Rhododendron Ericaceae 122
00005548 Rhododendron williamsianum Rehder & E.H.Wilson hybr. Rhododendron Ericaceae 122
00007435 Rhododendron 'Windlesham Scarlet' (R. 'Britannia' × R. 'Doncaster') Rhododendron 'Windlesham Scarlet' Ericaceae 106
00009131 Rhododendron 'Windlesham Scarlet' (R. 'Britannia' × R. 'Doncaster') Rhododendron 'Windlesham Scarlet' Ericaceae 010
00003492 Rhododendron 'Winsome' (R. 'Humming Bird' × R. griersonianum) Rhododendron 'Winsome' Ericaceae 108
00004388 Rhododendron 'Wishmoor' (R. yakushimanum × R. wardii Litiense Group) Rhododendron 'Wishmoor' Ericaceae 111  
00001358 Rhododendron 'Wishmoor' (R. yakushimanum × R. wardii Litiense Group) Rhododendron 'Wishmoor' Ericaceae 120
00007436 Rhododendron 'Witch Doctor' ((R. 'Doncaster' × R. Nereid Group) × R. 'Vulcan') Rhododendron 'Witch Doctor' Ericaceae 166
00001317 Rhododendron 'Wolga' (R. smirnowii × R. catawbiense 'Grandiflorum') Rhododendron 'Wolga' Ericaceae 122
00003426 Rhododendron 'Wolga' (R. smirnowii × R. catawbiense 'Grandiflorum') Rhododendron 'Wolga' Ericaceae 024  
00001692 Rhododendron 'Wombat' (Japanse azalea) Rhododendron 'Wombat' Ericaceae 118  
00001031 Rhododendron 'Woodcock' (R. Elizabeth Group × R. hyperythrum) Rhododendron 'Woodcock' Ericaceae 108
00003032 Rhododendron 'Woodcock' (R. Elizabeth Group × R. hyperythrum) Rhododendron 'Woodcock' Ericaceae 108
00001644 Rhododendron 'Worsil' Rhododendron 'Worsil' Ericaceae 126  
00001376 Rhododendron 'Wren' (R. ludlowii × R. keiskei 'Yaku Fairy') Rhododendron 'Wren' Ericaceae 128  
00007453 Rhododendron 'Wryneck' (Knap Hill/Exbury) Rhododendron 'Wryneck' Ericaceae 166
00009002 Rhododendron 'Wryneck' (Knap Hill/Exbury) Rhododendron 'Wryneck' Ericaceae 009
00001111 Rhododendron 'Yaku Duke' (R. 'King Tut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Yaku Duke' Ericaceae 122
00003935 Rhododendron 'Yaku King' (R. 'King Tut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Yaku King' Ericaceae 150  
00001118 Rhododendron 'Yaku Mama' (R. yakushimanum × R. 'Britannia') Rhododendron 'Yaku Mama' Ericaceae 121
00001114 Rhododendron 'Yakunowii' (R. yakushimanum × R. smirnowii) Rhododendron 'Yakunowii' Ericaceae 120
00003311 Rhododendron 'Yakunowii' (R. yakushimanum × R. smirnowii) Rhododendron 'Yakunowii' Ericaceae 120
00003242 Rhododendron 'Yaku Papa' (R. 'Britannia' × R. yakushimanum) Rhododendron 'Yaku Papa' Ericaceae 149  
00001602 Rhododendron 'Yaku Prince' (R. 'King Tut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Yaku Prince' Ericaceae 117
00001110 Rhododendron 'Yaku Queen' (R. 'King Tut' × R. yakushimanum 'Koichiro Wada') Rhododendron 'Yaku Queen' Ericaceae 122  
00001079 Rhododendron yakushimanum Nakai Rhododendron Ericaceae 124
00001080 Rhododendron yakushimanum Nakai Rhododendron Ericaceae 124
00001628 Rhododendron yakushimanum Nakai × R. campanulatum aeruginosum Rhododendron Ericaceae 120
00001256 Rhododendron yakushimanum Nakai × R. 'Catalgla' Rhododendron Ericaceae 120
00001329 Rhododendron yakushimanum Nakai × R. crinigerum Rhododendron Ericaceae 120
00003252 Rhododendron yakushimanum Nakai × R. decorum Rhododendron Ericaceae 111  
00009135 Rhododendron yakushimanum Nakai × R. decorum × R. niveum Rhododendron Ericaceae 174
00001115 Rhododendron yakushimanum Nakai 'Edelweiss' Rhododendron 'Edelweiss' Ericaceae 124
00003458 Rhododendron yakushimanum Nakai 'Edelweiss' † Rhododendron 'Edelweiss' Ericaceae ---
00008032 Rhododendron yakushimanum Nakai 'Edelweiss' × R. macabeanum Rhododendron 'Edelweis' Ericaceae 111  
20150180 Rhododendron yakushimanum Nakai 'Gooss' Rhododendron 'Gooss' Ericaceae 120  
00001355 Rhododendron yakushimanum Nakai 'Hanada' Rhododendron 'Hanada' Ericaceae 124
00009126 Rhododendron yakushimanum Nakai 'Hana No Ego' Rhododendron 'Hana No Ego' Ericaceae 174
00001058 Rhododendron yakushimanum Nakai 'Koichiro Wada' Rhododendron 'Koichiro Wada' Ericaceae 124
00001629 Rhododendron yakushimanum Nakai 'Koichiro Wada' Rhododendron 'Koichiro Wada'' Ericaceae 124
00003998 Rhododendron yakushimanum Nakai 'Koichiro Wada' Rhododendron 'Koichiro Wada' Ericaceae 036
00007185 Rhododendron yakushimanum Nakai 'Koichiro Wada' Rhododendron 'Koichiro Wada' Ericaceae 124
00001627 Rhododendron yakushimanum Nakai × R. lanatum Rhododendron Ericaceae 120
00003249 Rhododendron yakushimanum Nakai × R. 'Mars' Rhododendron Ericaceae 149  
00001096 Rhododendron yakushimanum Nakai 'Mist Maiden' Rhododendron 'Mist Maiden' Ericaceae 120
00009134 Rhododendron yakushimanum Nakai × R. niveum Rhododendron Ericaceae 174
00003251 Rhododendron yakushimanum Nakai × R. pachysanthum Rhododendron Ericaceae 120
00003945 Rhododendron yakushimanum Nakai × R. recurvoides Rhododendron Ericaceae 120
00003674 Rhododendron yakushimanum Nakai 'Schneekissen' Rhododendron 'Schneekissen' Ericaceae 149
00001257 Rhododendron yakushimanum Nakai × R. smirnowii Rhododendron Ericaceae 120
00007632 Rhododendron yakushimanum Nakai × R. strigillosum Rhododendron Ericaceae 111  
00004398 Rhododendron yakushimanum Nakai × R. 'Tortoise Wonder' Rhododendron Ericaceae 150  
00001262 Rhododendron yakushimanum Nakai × R. wiltonii Rhododendron Ericaceae 120
00003999 Rhododendron yakushimanum Nakai 'Yaku Angel' Rhododendron 'Yaku Angel' Ericaceae 036
00001125 Rhododendron yakushimanum Nakai 'Yaku Angel' Rhododendron 'Yaku Angel' Ericaceae 124  
00001120 Rhododendron yakushimanum Nakai 'Yaku Knospe' Rhododendron 'Yaku Knospe' Ericaceae 124
00003457 Rhododendron yakushimanum Nakai 'Yaku Knospe' Rhododendron 'Yaku Knospe' Ericaceae 111
00001258 Rhododendron yakushimanum Nakai 'Yaku Prince' × R. pseudochrysanthum Rhododendron 'Yaku Prince' Ericaceae 120
00008031 Rhododendron yakushimanum Nakai 'Yaku Prince' × R. pseudochrysanthum) Rhododendron 'Yaku Prince' Ericaceae 111  
00001042 Rhododendron yakushimanum Nakai hybrid Rhododendron Ericaceae 153  
00003238 Rhododendron 'Yakusmir' (R. yakushimanum × R. smirnowii) Rhododendron 'Yakusmir' Ericaceae 111  
00009005 Rhododendron 'Yasmina' (Knap Hill/Exbury) Rhododendron 'Yasmina' Ericaceae 006
00009049 Rhododendron yedoense Maxim. var. poukhanense (Lev.) Nakai Rhododendron Ericaceae 004
00009036 Rhododendron 'Cultivar' Rhododendron 'Cultivar' Ericaceae 175
20080021 Rhododendron 'Cultivar' (Harde Gentse) Rhododendron 'Cultivar' Ericaceae 176
00005672 Rhododendron 'Cultivar' Rhododendron Ericaceae 148
00006416 Rhododendron 'Cultivar' Rhododendron Ericaceae 148
00006638 Rhododendron 'Cultivar' Rhododendron Ericaceae 162
00003755 Rhododendron 'Cultivar' Rhododendron Ericaceae 105
00001109 Rhododendron 'Cultivar' Rhododendron Ericaceae 121  
00009014 Rhododendron 'Cultivar' Rhododendron Ericaceae 010
00009015 Rhododendron 'Cultivar' Rhododendron Ericaceae 010
00001695 Rhododendron 'Cultivar' Rhododendron 'Cultivar' Ericaceae 103
00006246 Rhododendron 'Cultivar' (Harde Gentse) Rhododendron Ericaceae 155
00001083 Rhododendron 'Cultivar' Rhododendron Ericaceae 153
00001090 Rhododendron 'Cultivar' Rhododendron Ericaceae 153
00003025 Rhododendron 'Cultivar' Rhododendron Ericaceae 036
00006248 Rhododendron 'Cultivar' (Harde Gentse) Rhododendron Ericaceae 155
00006518 Rhododendron 'Cultivar' Rhododendron Ericaceae 050
00004566 Rhododendron hybrid (Azaleodendron) Rhododendron Ericaceae 108  
00005584 Rhododendron species Rhododendron Ericaceae 139  
00005640 Rhododendron species Rhododendron Ericaceae 148
00005641 Rhododendron species Rhododendron Ericaceae 148
20140007 Rhododendron Rhododendron Ericaceae 014  
20140002 Rhododendron Rhododendron Ericaceae 014  

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