For rhododendron hybridisers

Hybridisers - Seed-species - Pollen-species - Seed-hybrid - Pollen-hybrid -   Hybrids/year - Back

All hybrid data based on IRRC, JARS or ICRA.?
The International Rhododendron Register and Checklist, Royal Horticultural Society.

Journal of the American Rhododendron Society

International Cultivar Registration Authority

For questions, suggestion or comments do not hesitate to email.

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Most popular species pollen-parent
1R. degronianum ssp yakushimanum ( Hymenanthes, Pontica, Pontica)102
2R. griersonianum ( Hymenanthes, Pontica, Griersoniana)97
3R. fortunei ssp fortunei ( Hymenanthes, Pontica, Fortunea)82
4R. williamsianum ( Hymenanthes, Pontica, Williamsiana)75
5R. griffithianum ( Hymenanthes, Pontica, Fortunea)75
6R. wardii var wardii ( Hymenanthes, Pontica, Campylocarpa)70
7R. fortunei ssp discolor ( Hymenanthes, Pontica, Fortunea)59
8R. javanicum ssp javanicum ( Rhododendron, Vireya, Euvireya)44
9R. zoelleri ( Rhododendron, Vireya, Euvireya)40
10R. arboreum ssp arboreum ( Hymenanthes, Pontica, Arborea)39
11R. kaempferi ( Tsutsusi, Tsutsusi, )36
12R. haematodes ssp haematodes ( Hymenanthes, Pontica, Neriiflora)35
13R. catawbiense ( Hymenanthes, Pontica, Pontica)33
14R. smirnowii ( Hymenanthes, Pontica, Pontica)33
15R. konori var konori ( Rhododendron, Vireya, Euvireya)33
16R. laetum ( Rhododendron, Vireya, Euvireya)32
17R. molle ssp japonicum ( Pentanthera, Pentanthera, Sinensia)31
18R. forrestii Repens Group ( Hymenanthes, Pontica, Neriiflora)31
19R. arborescens ( Pentanthera, Pentanthera, Pentanthera)30
20R. leucogigas ( Rhododendron, Vireya, Euvireya)30
21R. campylocarpum ssp campylocarpum ( Hymenanthes, Pontica, Campylocarpa)30
22R. elliottii ( Hymenanthes, Pontica, Parishia)29
23R. strigillosum ( Hymenanthes, Pontica, Maculifera)26
24R. facetum ( Hymenanthes, Pontica, Parishia)26
25R. thomsonii ssp thomsonii ( Hymenanthes, Pontica, Thomsonia)24
26R. aurigeranum ssp aurigeranum ( Rhododendron, Vireya, Euvireya)24
27R. macabeanum ( Hymenanthes, Pontica, Grandia)23
28R. calophytum var calophytum ( Hymenanthes, Pontica, Fortunea)23
29R. macgregoriae ( Rhododendron, Vireya, Euvireya)22
30R. decorum ssp decorum ( Hymenanthes, Pontica, Fortunea)21
31R. augustinii ssp augustinii ( Rhododendron, Rhododendron, Triflora)20
32R. racemosum ( Rhododendron, Rhododendron, Scabrifolia)19
33R. maximum ( Hymenanthes, Pontica, Pontica)19
34R. dichroanthum ssp dichroanthum ( Hymenanthes, Pontica, Neriiflora)18
35R. dauricum ( Rhododendron, Rhododendron, Rhodorastra)18
36R. proteoides ( Hymenanthes, Pontica, Taliensia)17
37R. ponticum ( Hymenanthes, Pontica, Pontica)17
38R. yedoense var poukhanense ( Tsutsusi, Tsutsusi, )16
39R. auriculatum ( Hymenanthes, Pontica, Auriculata)16
40R. austrinum ( Pentanthera, Pentanthera, Pentanthera)16
41R. jasminiflorum ssp jasminiflorum ( Rhododendron, Vireya, Euvireya)16
42R. moupinense ( Rhododendron, Rhododendron, Moupinensia)16
43R. christianae ( Rhododendron, Vireya, Euvireya)15
44R. viriosum ( Rhododendron, Vireya, Euvireya)15
45R. sutchuenense ( Hymenanthes, Pontica, Fortunea)14
46R. dichroanthum ssp scyphocalyx ( Hymenanthes, Pontica, Neriiflora)14
47R. javanicum ssp teysmannii ( Rhododendron, Vireya, Euvireya)13
48R. lacteum ( Hymenanthes, Pontica, Taliensia)13
49R. mucronatum var mucronatum ( Tsutsusi, Tsutsusi, )12
50R. wardii Litiense Group ( Hymenanthes, Pontica, Campanulata)12
51R. commonae ( Rhododendron, Vireya, Euvireya)12
52R. molle ssp molle ( Pentanthera, Pentanthera, Sinensia)11
53R. neriiflorum ssp neriiflorum ( Hymenanthes, Pontica, Neriiflora)11
54R. keiskei ( Rhododendron, Rhododendron, Triflora)11
55R. bureavii ( Hymenanthes, Pontica, Taliensia)11
56R. ciliatum ( Rhododendron, Rhododendron, Maddenia)11
57R. nuttallii ( Rhododendron, Rhododendron, Maddenia)10
58R. prinophyllum ( Pentanthera, Pentanthera, Pentanthera)10
59R. periclymenoides ( Pentanthera, Pentanthera, Pentanthera)10
60R. edgeworthii ( Rhododendron, Rhododendron, Edgeworthia)10
61R. mucronulatum var mucronulatum ( Rhododendron, Rhododendron, Rhodorastra)10
62R. viscosum ( Pentanthera, Pentanthera, Pentanthera)10
63R. burmanicum ( Rhododendron, Rhododendron, Maddenia)9
64R. cinnabarinum ssp xanthocodon Concatenans Group ( Rhododendron, Rhododendron, Cinnabarina)9
65R. sanguineum ssp sanguineum var haemaleum ( Hymenanthes, Pontica, Neriiflora)9
66R. leucaspis ( Rhododendron, Rhododendron, Boothia)9
67R. hyperythrum ( Hymenanthes, Pontica, Pontica)9
68R. insigne ( Hymenanthes, Pontica, Argyrophylla)8
69R. dauricum Sempervirens Group ( Rhododendron, Rhododendron, Rhodorastra)8
70R. indicum ( Tsutsusi, Tsutsusi, )8
71R. brachycarpum ssp tigerstedtii ( Hymenanthes, Pontica, Pontica)8
72R. minus Carolinianum Group ( Rhododendron, Rhododendron, Caroliniana)8
73R. gracilentum ( Rhododendron, Vireya, Euvireya)8
74R. fastigiatum ( Rhododendron, Rhododendron, Lapponica)8
75R. formosum var formosum ( Rhododendron, Rhododendron, Maddenia)8
76R. vernicosum ( Hymenanthes, Pontica, Fortunea)7
77R. kyawii ( Hymenanthes, Pontica, Parishia)7
78R. oreodoxa var fargesii ( Hymenanthes, Pontica, Fortunea)7
79R. decorum ssp diaprepes ( Hymenanthes, Pontica, Fortunea)7
80R. konori var phaeopeplum ( Rhododendron, Vireya, Euvireya)7
81R. pachysanthum ( Hymenanthes, Pontica, Maculifera)7
82R. cumberlandense ( Pentanthera, Pentanthera, Pentanthera)7
83R. saxifragoides ( Rhododendron, Vireya, Euvireya)7
84R. kiusianum var kiusianum ( Tsutsusi, Tsutsusi, )7
85R. valentinianum ( Rhododendron, Rhododendron, Maddenia)7
86R. cinnabarinum ssp xanthocodon ( Rhododendron, Rhododendron, Cinnabarina)7
87R. forrestii ssp forrestii ( Hymenanthes, Pontica, Neriiflora)7
88R. maddenii ssp maddenii ( Rhododendron, Rhododendron, Maddenia)6
89R. dalhousiae var dalhousiae ( Rhododendron, Rhododendron, Maddenia)6
90R. neriiflorum ssp neriiflorum Euchaites Group ( Hymenanthes, Pontica, Neriiflora)6
91R. davidsonianum ( Rhododendron, Rhododendron, Triflora)6
92R. barbatum ( Hymenanthes, Pontica, Barbata)6
93R. occidentale ( Pentanthera, Pentanthera, Pentanthera)6
94R. calendulaceum ( Pentanthera, Pentanthera, Pentanthera)6
95R. sinogrande ( Hymenanthes, Pontica, Grandia)6
96R. souliei ( Hymenanthes, Pontica, Campylocarpa)6
97R. aureum var aureum ( Hymenanthes, Pontica, Pontica)6
98R. orbiculare ssp orbiculare ( Hymenanthes, Pontica, Fortunea)5
99R. fletcherianum ( Rhododendron, Rhododendron, Maddenia)5
100R. aberconwayi ( Hymenanthes, Pontica, Irrorata)5
101R. viscidifolium ( Hymenanthes, Pontica, Thomsonia)5
102R. herzogii ( Rhododendron, Vireya, Euvireya)5
103R. hookeri ( Hymenanthes, Pontica, Thomsonia)5
104R. degronianum ssp degronianum ( Hymenanthes, Pontica, Pontica)5
105R. campylocarpum Elatum Group ( Hymenanthes, Pontica, Campylocarpa)5
106R. canescens ( Pentanthera, Pentanthera, Pentanthera)5
107R. impeditum ( Rhododendron, Rhododendron, Lapponica)5
108R. lochiae ( Rhododendron, Vireya, Euvireya)5
109R. lutescens ( Rhododendron, Rhododendron, Triflora)5
110R. luteum ( Pentanthera, Pentanthera, Pentanthera)5
111R. lindleyi ( Rhododendron, Rhododendron, Maddenia)5
112R. nakaharae ( Tsutsusi, Tsutsusi, )5
113R. grande ( Hymenanthes, Pontica, Grandia)5
114R. rubineiflorum ( Rhododendron, Vireya, Euvireya)5
115R. campanulatum ssp campanulatum ( Hymenanthes, Pontica, Campanulata)5
116R. tsariense ( Hymenanthes, Pontica, Lanata)4
117R. christi ( Rhododendron, Vireya, Euvireya)4
118R. irroratum ssp irroratum ( Hymenanthes, Pontica, Irrorata)4
119R. simsii var simsii ( Tsutsusi, Tsutsusi, )4
120R. flammeum ( Pentanthera, Pentanthera, Pentanthera)4
121R. pseudochrysanthum ( Hymenanthes, Pontica, Maculifera)4
122R. beanianum ( Hymenanthes, Pontica, Neriiflora)4
123R. leptanthum ( Rhododendron, Vireya, Euvireya)4
124R. polycladum Scintillans Group ( Rhododendron, Rhododendron, Lapponica)4
125R. rex ssp rex ( Hymenanthes, Pontica, Falconera)4
126R. virgatum ssp virgatum ( Rhododendron, Rhododendron, Virgata)4
127R. oldhamii ( Tsutsusi, Tsutsusi, )4
128R. sperabile var sperabile ( Hymenanthes, Pontica, Neriiflora)4
129R. maddenii ssp crassum ( Rhododendron, Rhododendron, Maddenia)4
130R. falconeri ssp eximium ( Hymenanthes, Pontica, Falconera)4
131R. ludlowii ( Rhododendron, Rhododendron, Uniflora)4
132R. venator ( Hymenanthes, Pontica, Venatora)4
133R. stenophyllum ssp stenophyllum ( Rhododendron, Vireya, Euvireya)4
134R. brachycarpum ssp brachycarpum ( Hymenanthes, Pontica, Pontica)4
135R. meddianum var meddianum ( Hymenanthes, Pontica, Thomsonia)4
136R. makinoi ( Hymenanthes, Pontica, Pontica)4
137R. hanceanum Nanum Group ( Rhododendron, Rhododendron, Tephroplepa)3
138R. brookeanum ssp brookeanum var gracile ( , , )3
139R. kaempferi ( , , )3
140R. diphrocalyx ( Hymenanthes, Pontica, Glischra)3
141R. lapponicum ( Rhododendron, Rhododendron, Lapponica)3
142R. spinuliferum ( Rhododendron, Rhododendron, Scabrifolia)3
143R. praevernum ( Hymenanthes, Pontica, Fortunea)3
144R. retusum var retusum ( Rhododendron, Discovireya, )3
145R. niveum ( Hymenanthes, Pontica, Arborea)3
146R. arboreum ssp cinnamomeum ( Hymenanthes, Pontica, Arborea)3
147R. dichroanthum ssp apodectum ( Hymenanthes, Pontica, Neriiflora)3
148R. rex ssp fictolacteum ( Hymenanthes, Pontica, Falconera)3
149R. ambiguum ( Rhododendron, Rhododendron, Triflora)3
150R. superbum ssp superbum ( Rhododendron, Vireya, Euvireya)3
151R. ciliicalyx ssp ciliicalyx ( Rhododendron, Rhododendron, Maddenia)3
152R. pemakoense ( Rhododendron, Rhododendron, Uniflora)3
153R. hemsleyanum ( Hymenanthes, Pontica, Fortunea)3
154R. cinnabarinum ssp cinnabarinum ( Rhododendron, Rhododendron, Cinnabarina)3
155R. lanatum ( Hymenanthes, Pontica, Lanata)3
156R. caucasicum ( Hymenanthes, Pontica, Pontica)3
157R. brookeanum ssp brookeanum ( Rhododendron, Vireya, Euvireya)3
158R. arboreum ssp delavayi ( Hymenanthes, Pontica, Arborea)3
159R. Sir Charles Lemon ( Hymenanthes, Pontica, Arborea)3
160R. arboreum Kingianum Group ( Hymenanthes, Pontica, Arborea)3
161R. arboreum ssp zeylanicum ( Hymenanthes, Pontica, Arborea)3
162R. minus var minus ( Rhododendron, Rhododendron, Caroliniana)3
163R. bagobonum ( Rhododendron, Vireya, Euvireya)3
164R. pocophorum var pocophorum ( Hymenanthes, Pontica, Neriiflora)2
165R. longiflorum var longiflorum ( Rhododendron, Vireya, Euvireya)2
166R. augustinii ssp chasmantum ( Rhododendron, Rhododendron, Triflora)2
167R. oreodoxa var oreodoxa ( Hymenanthes, Pontica, Fortunea)2
168R. orbiculatum ( Rhododendron, Vireya, Euvireya)2
169R. yunnanense ( Rhododendron, Rhododendron, Triflora)2
170R. prunifolium ( Pentanthera, Pentanthera, Pentanthera)2
171R. anwheiense ( Hymenanthes, Pontica, Maculifera)2
172R. multicolor ( Rhododendron, Vireya, Euvireya)2
173R. malayanum var malayanum f malayanum ( Rhododendron, Vireya, Malayovireya)2
174R. lobbii ( , , )2
175R. pseudonitens ( , , )2
176R. detonsum ( Hymenanthes, Pontica, Taliensia)2
177R. ferrugineum ( Rhododendron, Rhododendron, Rhododendron)2
178R. jasminiflorum var punctatum ( Rhododendron, Vireya, Euvireya)2
179R. solitarium ( Rhododendron, Vireya, Euvireya)2
180R. wightii ( Hymenanthes, Pontica, Taliensia)2
181R. cinnabarinum ssp cinnabarinum Blandfordiiflorum ( Rhododendron, Rhododendron, Cinnabarina)2
182R. scabrifolium var spiciferum ( Rhododendron, Rhododendron, Scabrifolia)2
183R. aequabile ( Rhododendron, Vireya, Euvireya)2
184R. horaeum ( Hymenanthes, Pontica, Neriiflora)2
185R. falconeri ssp falconeri ( Hymenanthes, Pontica, Falconera)2
186R. campylogynum ( Rhododendron, Rhododendron, Campylogyna)2
187R. carringtoniae ( , , )2
188R. morii ( Hymenanthes, Pontica, Maculifera)2
189R. haematodes ssp chaetomallum ( Hymenanthes, Pontica, Neriiflora)2
190R. intranervatum ( Rhododendron, Vireya, Euvireya)2
191R. culminicola var culminicola ( Rhododendron, Vireya, Euvireya)2
192R. galactinum ( Hymenanthes, Pontica, Falconera)2
193R. aureum ( , , )2
194R. flavidum ( Rhododendron, Rhododendron, Lapponica)2
195R. mekongense var mekongense ( Rhododendron, Rhododendron, Trichoclada)2
196R. magnificum ( Hymenanthes, Pontica, Grandia)2
197R. keysii ( Rhododendron, Rhododendron, Cinnabarina)2
198R. xanthostephanum ( Rhododendron, Rhododendron, Tephroplepa)2
199R. russatum ( Rhododendron, Rhododendron, Lapponica)2
200R. boothii ( Rhododendron, Rhododendron, Boothia)2
201R. basilicum ( Hymenanthes, Pontica, Falconera)2
202R. atlanticum ( Pentanthera, Pentanthera, Pentanthera)2
203R. floccigerum ( Hymenanthes, Pontica, Neriiflora)2
204R. loranthiflorum ssp loranthiflorum ( Rhododendron, Vireya, Euvireya)2
205R. johnstoneanum ( Rhododendron, Rhododendron, Maddenia)2
206R. campylocarpum ssp caloxanthum ( Hymenanthes, Pontica, Campylocarpa)2
207R. cinnabarinum ssp cinnabarinum Roylei Group ( Rhododendron, Rhododendron, Cinnabarina)2
208R. calostrotum ssp riparioides ( Rhododendron, Rhododendron, Saluenensia)2
209R. roxieanum var roxieanum ( Hymenanthes, Pontica, Taliensia)2
210R. ungernii ( Hymenanthes, Pontica, Pontica)2
211R. glaucophyllum var glaucophyllum ( Rhododendron, Rhododendron, Glauca)2
212R. sulfureum ( Rhododendron, Rhododendron, Boothia)2
213R. chrysodoron ( Rhododendron, Rhododendron, Boothia)2
214R. anthosphaerum ( Hymenanthes, Pontica, Irrorata)1
215R. polycladum ( Rhododendron, Rhododendron, Lapponica)1
216R. hippophaeoides var hippophaeoides ( Rhododendron, Rhododendron, Lapponica)1
217R. hirsutum ( Rhododendron, Rhododendron, Rhododendron)1
218R. mekongense var mekongense Viridescens Group ( Rhododendron, Rhododendron, Trichoclada)1
219R. scabrum ssp scabrum ( Tsutsusi, Tsutsusi, )1
220R. pronum ( Hymenanthes, Pontica, Taliensia)1
221R. aperantum ( Hymenanthes, Pontica, Neriiflora)1
222R. weyrichii ( Tsutsusi, Brachycalyx, )1
223R. zaleucum var zaleucum ( Rhododendron, Rhododendron, Triflora)1
224R. fortunei ssp discolor Houlstonii Group ( Hymenanthes, Pontica, Fortunea)1
225R. campylogynum Cremastum Group ( Rhododendron, Rhododendron, Campylogyna)1
226R. praetervisum ( Rhododendron, Vireya, Euvireya)1
227R. degronianum ssp heptamerum var hondoense ( Hymenanthes, Pontica, Pontica)1
228R. virgatum ssp oleifolium ( Rhododendron, Rhododendron, Virgata)1
229R. viscosum Serrulatum Group ( Pentanthera, Pentanthera, Pentanthera)1
230R. moulmainense ( Azaleastrum, Choniastrum, )1
231R. longesquamatum ( Hymenanthes, Pontica, Maculifera)1
232R. alabamense ( Pentanthera, Pentanthera, Pentanthera)1
233R. calostrotum ssp calostrotum ( Rhododendron, Rhododendron, Saluenensia)1
234R. praestans ( Hymenanthes, Pontica, Grandia)1
235R. microgynum ( Hymenanthes, Pontica, Neriiflora)1
236R. eriogynum ( , , )1
237R. kosterianum ( Pentanthera, Pentanthera, Sinensia)1
238R. stewartianum ( Hymenanthes, Pontica, Thomsonia)1
239R. brachyanthum ssp hypolepidotum ( Rhododendron, Rhododendron, Glauca)1
240R. faberi ( Hymenanthes, Pontica, Taliensia)1
241R. glischrum ssp glischrum ( Hymenanthes, Pontica, Glischra)1
242R. tephropeplum ( Rhododendron, Rhododendron, Tephroplepa)1
243R. yakushimanum ( , , )1
244R. phaeochitum ( Rhododendron, Vireya, Euvireya)1
245R. veitchianum ( Rhododendron, Rhododendron, Maddenia)1
246R. thayerianum ( Hymenanthes, Pontica, Argyrophylla)1
247R. rubiginosum Desquamatum Group ( Rhododendron, Rhododendron, Heliolepida)1
248R. triflorum var triflorum ( Rhododendron, Rhododendron, Triflora)1
249R. rubiginosum ( Rhododendron, Rhododendron, Heliolepida)1
250R. inconspicuum ( Rhododendron, Vireya, Euvireya)1
251R. maddenii ssp maddenii Polyandrum Group ( Rhododendron, Rhododendron, Maddenia)1
252R. eclecteum var eclecteum ( Hymenanthes, Pontica, Thomsonia)1
253R. macrophyllum ( Hymenanthes, Pontica, Pontica)1
254R. viridescens ( Rhododendron, Rhododendron, Trichoclada)1
255R. lepidotum ( Rhododendron, Rhododendron, Lepidota)1
256R. dalhousiae var rhabdotum ( Rhododendron, Rhododendron, Maddenia)1
257R. womersleyi ( Rhododendron, Vireya, Euvireya)1
258R. formosum var inaequale ( Rhododendron, Rhododendron, Maddenia)1
259R. hirtipes ( Hymenanthes, Pontica, Selensia)1
260R. dendrocharis ( Rhododendron, Rhododendron, Moupinensia)1
261R. pachypodum ( Rhododendron, Rhododendron, Maddenia)1
262R. spilotum ( Hymenanthes, Pontica, Glischra)1
263R. myrtifolium ( Rhododendron, Rhododendron, Rhododendron)1
264R. concinnum var benthamianum ( , , )1
265R. dielsianum var dielsianum ( Rhododendron, Vireya, Euvireya)1
266R. taggianum ( Rhododendron, Rhododendron, Maddenia)1
267R. taliense ( Hymenanthes, Pontica, Taliensia)1
268R. dauricum var sempervirens ( , , )1
269R. trichostomum ( Rhododendron, Pogonanthum, )1
270R. mallotum ( Hymenanthes, Pontica, Neriiflora)1
271R. ( , Pontica, Neriiflora)1
272R. macrosepalum ( Tsutsusi, Tsutsusi, )1
273R. pemakoense Patulum Group ( Rhododendron, Rhododendron, Uniflora)1
274R. trichocladum ( Rhododendron, Rhododendron, Trichoclada)1
275R. multicolor var curtisii ( , , )1
276R. callimorphum var callimorphum ( Hymenanthes, Pontica, Campylocarpa)1
277R. polyanthemum ( Rhododendron, Vireya, Euvireya)1
278R. geraldii ( Hymenanthes, Pontica, Fortunea)1
279R. mucronatum var ripense ( Tsutsusi, Tsutsusi, )1
280R. alabamense ( , , )1
281R. adenogynum ( Hymenanthes, Pontica, Taliensia)1
282R. luteiflorum ( Rhododendron, Rhododendron, Glauca)1
283R. luciferum ( Hymenanthes, Pontica, Lanata)1
284R. mollicomum ( Rhododendron, Rhododendron, Scabrifolia)1
285R. cuffeanum ( Rhododendron, Rhododendron, Maddenia)1
286R. salicifolium ( Rhododendron, Vireya, Euvireya)1
287R. hodgsonii ( Hymenanthes, Pontica, Falconera)1
288R. makinoi ( , , )1
289R. concinnum ( Rhododendron, Rhododendron, Triflora)1
290R. sanguineum ssp sanguineum var sanguineum ( Hymenanthes, Pontica, Neriiflora)1
291R. hanceanum ( Rhododendron, Rhododendron, Tephroplepa)1
292R. groenlandicum ( Rhododendron, Rhododendron, Ledum)1
293R. anagalliflorum ( Rhododendron, Vireya, Euvireya)1
294R. pachytrichum ( Hymenanthes, Pontica, Maculifera)1
295R. saluenense ssp saluenense ( Rhododendron, Rhododendron, Saluenensia)1
296R. orbiculare ssp cardiobasis ( Hymenanthes, Pontica, Fortunea)1
297R. degronianum ssp heptamerum ( Hymenanthes, Pontica, Pontica)1
298R. orthocladum var microleucum ( Rhododendron, Rhododendron, Lapponica)1
299R. chlorops ( , , )1
300R. hellwigii ( Rhododendron, Vireya, Euvireya)1
301R. rhodoleucum ( Rhododendron, Vireya, Euvireya)1
302R. wardii var puralbum ( Hymenanthes, Pontica, Campylocarpa)1
303R. arboreum ssp cinnamomeum var cinnamomeum ( Hymenanthes, Pontica, Arborea)1
304R. montroseanum ( Hymenanthes, Pontica, Grandia)1
305R. brachycarpum ssp fauriei f nematoanum ( Hymenanthes, Pontica, Pontica)1
306R. brachycarpum ( , , )1
307R. pauciflorum ( Rhododendron, Vireya, Euvireya)1
308R. multinervium ( Rhododendron, Vireya, Euvireya)1
309R. sulphureum ( , , )1
310R. rothschildii ( Hymenanthes, Pontica, Falconera)1
311R. ( , Pontica, Falconera)1
312R. wiltonii ( Hymenanthes, Pontica, Taliensia)1
313R. floribundum ( Hymenanthes, Pontica, Argyrophylla)1
314R. crassifolium var crassifolium ( Rhododendron, Vireya, Euvireya)1
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Listed Hybrids / cultivars2037656.605 %
Groups (formerly grex)661
Unregistered hybrids What?
Unregistered Hybrids

This category involves:
  • all named hybrids that have no registration in the IRRC, ICRA or JARS
  • all unnamed crosses (like: 'yakushimanum x bureavii')

Listed Hybrids + hybridizer-details1486272.945 %
Listed Hybrids + picture417620.495 %

Estimated total number of hybrids = 36.000

Last 2 hybrid pictures added to hirsutum database:

R. 'Proteo-pron' (Thompsonís Nursery Waldport, Oregon USA)

Photo by: Harold E. Greer
Location: Greer Gardens, Eugene, USA 11 May, 2008

R. 'Odoratum' (Thompson, London , 1869)

Photo by: Harold E. Greer
Location: Greer Gardens, Eugene, USA 15 May, 1988

Last species picture added to hirsutum database
R. acrophilum

Photo by:

Photo Everard Daniel, Sherwood Garden, UK

Photo Tijs Huisman, Round Bald, Roan Mountain
North Carolina USA, June 19 2006

Photo Everard Daniel, Sheffield Park gardens, Sussex (National Trust) , UK
Rhododendron G.A. Sims, May 30 2004

Photo Yves Tuset, Leonardslee , UK
Rhododendron 'Smithii Group' with wallabies, April 2003
_____________________________________________________________________________________________________________________________________     Project started 03 June 2009