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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.

Most popular species seed-parent
1R. degronianum ssp yakushimanum ( Hymenanthes, Pontica, Pontica)216
2R. catawbiense ( Hymenanthes, Pontica, Pontica)140
3R. fortunei ssp fortunei ( Hymenanthes, Pontica, Fortunea)115
4R. griffithianum ( Hymenanthes, Pontica, Fortunea)84
5R. griersonianum ( Hymenanthes, Pontica, Griersoniana)63
6R. maximum ( Hymenanthes, Pontica, Pontica)63
7R. wardii var wardii ( Hymenanthes, Pontica, Campylocarpa)61
8R. fortunei ssp discolor ( Hymenanthes, Pontica, Fortunea)56
9R. arboreum ssp arboreum ( Hymenanthes, Pontica, Arborea)52
10R. minus Carolinianum Group ( Rhododendron, Rhododendron, Caroliniana)48
11R. dichroanthum ssp dichroanthum ( Hymenanthes, Pontica, Neriiflora)43
12R. mucronatum var mucronatum ( Tsutsusi, Tsutsusi, )42
13R. indicum ( Tsutsusi, Tsutsusi, )42
14R. campylocarpum ssp campylocarpum ( Hymenanthes, Pontica, Campylocarpa)41
15R. konori var konori ( Rhododendron, Vireya, Euvireya)39
16R. ponticum ( Hymenanthes, Pontica, Pontica)37
17R. laetum ( Rhododendron, Vireya, Euvireya)36
18R. smirnowii ( Hymenanthes, Pontica, Pontica)36
19R. caucasicum ( Hymenanthes, Pontica, Pontica)33
20R. decorum ssp decorum ( Hymenanthes, Pontica, Fortunea)33
21R. molle ssp molle ( Pentanthera, Pentanthera, Sinensia)32
22R. kaempferi ( Tsutsusi, Tsutsusi, )32
23R. thomsonii ssp thomsonii ( Hymenanthes, Pontica, Thomsonia)31
24R. viriosum ( Rhododendron, Vireya, Euvireya)28
25R. cumberlandense ( Pentanthera, Pentanthera, Pentanthera)28
26R. yedoense var poukhanense ( Tsutsusi, Tsutsusi, )27
27R. williamsianum ( Hymenanthes, Pontica, Williamsiana)26
28R. javanicum ssp javanicum ( Rhododendron, Vireya, Euvireya)26
29R. aurigeranum ssp aurigeranum ( Rhododendron, Vireya, Euvireya)26
30R. zoelleri ( Rhododendron, Vireya, Euvireya)25
31R. haematodes ssp haematodes ( Hymenanthes, Pontica, Neriiflora)24
32R. macgregoriae ( Rhododendron, Vireya, Euvireya)23
33R. viscosum ( Pentanthera, Pentanthera, Pentanthera)22
34R. racemosum ( Rhododendron, Rhododendron, Scabrifolia)20
35R. forrestii Repens Group ( Hymenanthes, Pontica, Neriiflora)20
36R. keiskei ( Rhododendron, Rhododendron, Triflora)18
37R. calophytum var calophytum ( Hymenanthes, Pontica, Fortunea)18
38R. souliei ( Hymenanthes, Pontica, Campylocarpa)18
39R. brachycarpum ssp tigerstedtii ( Hymenanthes, Pontica, Pontica)16
40R. ciliatum ( Rhododendron, Rhododendron, Maddenia)15
41R. atlanticum ( Pentanthera, Pentanthera, Pentanthera)15
42R. russatum ( Rhododendron, Rhododendron, Lapponica)14
43R. macabeanum ( Hymenanthes, Pontica, Grandia)14
44R. christianae ( Rhododendron, Vireya, Euvireya)14
45R. edgeworthii ( Rhododendron, Rhododendron, Edgeworthia)14
46R. brachycarpum ssp brachycarpum ( Hymenanthes, Pontica, Pontica)14
47R. leucogigas ( Rhododendron, Vireya, Euvireya)13
48R. falconeri ssp falconeri ( Hymenanthes, Pontica, Falconera)13
49R. cinnabarinum ssp cinnabarinum Roylei Group ( Rhododendron, Rhododendron, Cinnabarina)13
50R. calendulaceum ( Pentanthera, Pentanthera, Pentanthera)13
51R. campanulatum ssp campanulatum ( Hymenanthes, Pontica, Campanulata)12
52R. elliottii ( Hymenanthes, Pontica, Parishia)12
53R. lochiae ( Rhododendron, Vireya, Euvireya)12
54R. auriculatum ( Hymenanthes, Pontica, Auriculata)12
55R. impeditum ( Rhododendron, Rhododendron, Lapponica)12
56R. neriiflorum ssp neriiflorum ( Hymenanthes, Pontica, Neriiflora)12
57R. lacteum ( Hymenanthes, Pontica, Taliensia)12
58R. augustinii ssp augustinii ( Rhododendron, Rhododendron, Triflora)12
59R. arborescens ( Pentanthera, Pentanthera, Pentanthera)11
60R. austrinum ( Pentanthera, Pentanthera, Pentanthera)11
61R. occidentale ( Pentanthera, Pentanthera, Pentanthera)11
62R. dichroanthum ssp scyphocalyx ( Hymenanthes, Pontica, Neriiflora)11
63R. irroratum ssp irroratum ( Hymenanthes, Pontica, Irrorata)11
64R. nuttallii ( Rhododendron, Rhododendron, Maddenia)10
65R. facetum ( Hymenanthes, Pontica, Parishia)10
66R. strigillosum ( Hymenanthes, Pontica, Maculifera)9
67R. grande ( Hymenanthes, Pontica, Grandia)9
68R. insigne ( Hymenanthes, Pontica, Argyrophylla)9
69R. jasminiflorum ssp jasminiflorum ( Rhododendron, Vireya, Euvireya)9
70R. leucaspis ( Rhododendron, Rhododendron, Boothia)9
71R. nakaharae ( Tsutsusi, Tsutsusi, )9
72R. hyperythrum ( Hymenanthes, Pontica, Pontica)9
73R. aureum var aureum ( Hymenanthes, Pontica, Pontica)9
74R. minus var minus ( Rhododendron, Rhododendron, Caroliniana)9
75R. molle ssp japonicum ( Pentanthera, Pentanthera, Sinensia)9
76R. konori var phaeopeplum ( Rhododendron, Vireya, Euvireya)8
77R. aberconwayi ( Hymenanthes, Pontica, Irrorata)8
78R. ambiguum ( Rhododendron, Rhododendron, Triflora)8
79R. bureavii ( Hymenanthes, Pontica, Taliensia)8
80R. dauricum ( Rhododendron, Rhododendron, Rhodorastra)7
81R. loranthiflorum ssp loranthiflorum ( Rhododendron, Vireya, Euvireya)7
82R. maddenii ssp maddenii ( Rhododendron, Rhododendron, Maddenia)7
83R. cinnabarinum ssp cinnabarinum ( Rhododendron, Rhododendron, Cinnabarina)7
84R. burmanicum ( Rhododendron, Rhododendron, Maddenia)7
85R. prunifolium ( Pentanthera, Pentanthera, Pentanthera)7
86R. simsii var simsii ( Tsutsusi, Tsutsusi, )7
87R. johnstoneanum ( Rhododendron, Rhododendron, Maddenia)6
88R. lindleyi ( Rhododendron, Rhododendron, Maddenia)6
89R. valentinianum ( Rhododendron, Rhododendron, Maddenia)6
90R. spinuliferum ( Rhododendron, Rhododendron, Scabrifolia)6
91R. minus var chapmanii ( Rhododendron, Rhododendron, Caroliniana)6
92R. lutescens ( Rhododendron, Rhododendron, Triflora)6
93R. barbatum ( Hymenanthes, Pontica, Barbata)6
94R. sanguineum ssp didymum ( Hymenanthes, Pontica, Neriiflora)5
95R. decorum ssp diaprepes ( Hymenanthes, Pontica, Fortunea)5
96R. prinophyllum ( Pentanthera, Pentanthera, Pentanthera)5
97R. moupinense ( Rhododendron, Rhododendron, Moupinensia)5
98R. campylogynum ( Rhododendron, Rhododendron, Campylogyna)5
99R. kiusianum var kiusianum ( Tsutsusi, Tsutsusi, )5
100R. pemakoense ( Rhododendron, Rhododendron, Uniflora)5
101R. commonae ( Rhododendron, Vireya, Euvireya)5
102R. campylocarpum Elatum Group ( Hymenanthes, Pontica, Campylocarpa)5
103R. Sir Charles Lemon ( Hymenanthes, Pontica, Arborea)5
104R. wightii ( Hymenanthes, Pontica, Taliensia)5
105R. yunnanense ( Rhododendron, Rhododendron, Triflora)5
106R. oreotrephes ( Rhododendron, Rhododendron, Triflora)5
107R. yedoense var yedoense ( Tsutsusi, Tsutsusi, )5
108R. eriocarpum ( Tsutsusi, Tsutsusi, )5
109R. degronianum ssp degronianum ( Hymenanthes, Pontica, Pontica)5
110R. luteum ( Pentanthera, Pentanthera, Pentanthera)4
111R. arboreum ssp zeylanicum ( Hymenanthes, Pontica, Arborea)4
112R. vernicosum ( Hymenanthes, Pontica, Fortunea)4
113R. kosterianum ( Pentanthera, Pentanthera, Sinensia)4
114R. meddianum var meddianum ( Hymenanthes, Pontica, Thomsonia)4
115R. mucronulatum var mucronulatum ( Rhododendron, Rhododendron, Rhodorastra)4
116R. ungernii ( Hymenanthes, Pontica, Pontica)4
117R. stenophyllum ssp stenophyllum ( Rhododendron, Vireya, Euvireya)4
118R. rex ssp rex ( Hymenanthes, Pontica, Falconera)4
119R. multicolor ( Rhododendron, Vireya, Euvireya)4
120R. makinoi ( Hymenanthes, Pontica, Pontica)4
121R. xanthostephanum ( Rhododendron, Rhododendron, Tephroplepa)4
122R. nikomontanum ( Mumeazalea, Pontica, Pontica)4
123R. intranervatum ( Rhododendron, Vireya, Euvireya)3
124R. hellwigii ( Rhododendron, Vireya, Euvireya)3
125R. brachyanthum ssp brachyanthum ( Rhododendron, Rhododendron, Glauca)3
126R. detonsum ( Hymenanthes, Pontica, Taliensia)3
127R. flammeum ( Pentanthera, Pentanthera, Pentanthera)3
128R. cinnabarinum ssp xanthocodon Concatenans Group ( Rhododendron, Rhododendron, Cinnabarina)3
129R. oreodoxa var fargesii ( Hymenanthes, Pontica, Fortunea)3
130R. augustinii ssp chasmantum ( Rhododendron, Rhododendron, Triflora)3
131R. fortunei ssp discolor Houlstonii Group ( Hymenanthes, Pontica, Fortunea)3
132R. hodgsonii ( Hymenanthes, Pontica, Falconera)3
133R. dichroanthum ssp apodectum ( Hymenanthes, Pontica, Neriiflora)3
134R. macrophyllum ( Hymenanthes, Pontica, Pontica)3
135R. superbum ssp superbum ( Rhododendron, Vireya, Euvireya)3
136R. brachycarpum ssp fauriei ( Hymenanthes, Pontica, Pontica)3
137R. pubescens ( Rhododendron, Rhododendron, Scabrifolia)3
138R. rupicola var chryseum ( Rhododendron, Rhododendron, Lapponica)3
139R. tephropeplum ( Rhododendron, Rhododendron, Tephroplepa)3
140R. hanceanum Nanum Group ( Rhododendron, Rhododendron, Tephroplepa)3
141R. scabrum ssp scabrum ( Tsutsusi, Tsutsusi, )3
142R. hemsleyanum ( Hymenanthes, Pontica, Fortunea)3
143R. hookeri ( Hymenanthes, Pontica, Thomsonia)3
144R. calostrotum ssp calostrotum ( Rhododendron, Rhododendron, Saluenensia)3
145R. gracilentum ( Rhododendron, Vireya, Euvireya)3
146R. sanguineum ssp sanguineum var didymoides ( Hymenanthes, Pontica, Neriiflora)3
147R. venator ( Hymenanthes, Pontica, Venatora)3
148R. ciliicalyx ssp ciliicalyx ( Rhododendron, Rhododendron, Maddenia)3
149R. ludlowii ( Rhododendron, Rhododendron, Uniflora)3
150R. brookeanum ssp brookeanum var gracile ( , , )3
151R. orbiculare ssp orbiculare ( Hymenanthes, Pontica, Fortunea)2
152R. gardenia ( Rhododendron, Vireya, Euvireya)2
153R. praestans ( Hymenanthes, Pontica, Grandia)2
154R. orbiculatum ( Rhododendron, Vireya, Euvireya)2
155R. herzogii ( Rhododendron, Vireya, Euvireya)2
156R. intricatum ( Rhododendron, Rhododendron, Lapponica)2
157R. hippophaeoides var hippophaeoides ( Rhododendron, Rhododendron, Lapponica)2
158R. sessilifolium ( Rhododendron, Vireya, Euvireya)2
159R. canadense ( Pentanthera, Rhodora, )2
160R. fulgens ( Hymenanthes, Pontica, Fulgensia)2
161R. viscidifolium ( Hymenanthes, Pontica, Thomsonia)2
162R. indicum ( Tsutsusi, Tsutsusi, )2
163R. dalhousiae var dalhousiae ( Rhododendron, Rhododendron, Maddenia)2
164R. yakushimanum ( , , )2
165R. flavidum ( Rhododendron, Rhododendron, Lapponica)2
166R. brookeanum ssp gracile ( Rhododendron, Vireya, Euvireya)2
167R. cinnabarinum ssp xanthocodon ( Rhododendron, Rhododendron, Cinnabarina)2
168R. formosum var formosum ( Rhododendron, Rhododendron, Maddenia)2
169R. calostrotum ssp keleticum Radicans Group ( Rhododendron, Rhododendron, Saluenensia)2
170R. sinogrande ( Hymenanthes, Pontica, Grandia)2
171R. rubiginosum Desquamatum Group ( Rhododendron, Rhododendron, Heliolepida)2
172R. chlorops ( , , )2
173R. rubropilosum ( Tsutsusi, Tsutsusi, )2
174R. saxifragoides ( Rhododendron, Vireya, Euvireya)2
175R. brachycarpum ssp brachycarpum f fauriei ( , , )2
176R. periclymenoides ( Pentanthera, Pentanthera, Pentanthera)2
177R. tuba ( Rhododendron, Vireya, Euvireya)2
178R. rhodoleucum ( Rhododendron, Vireya, Euvireya)2
179R. aperantum ( Hymenanthes, Pontica, Neriiflora)2
180R. calostrotum ssp keleticum ( Rhododendron, Rhododendron, Saluenensia)2
181R. retusum var retusum ( Rhododendron, Discovireya, )2
182R. pseudochrysanthum ( Hymenanthes, Pontica, Maculifera)2
183R. chrysodoron ( Rhododendron, Rhododendron, Boothia)2
184R. niveum ( Hymenanthes, Pontica, Arborea)2
185R. campylocarpum ssp caloxanthum ( Hymenanthes, Pontica, Campylocarpa)2
186R. wardii Litiense Group ( Hymenanthes, Pontica, Campanulata)2
187R. praetervisum ( Rhododendron, Vireya, Euvireya)2
188R. lowndesii ( Rhododendron, Rhododendron, Lepidota)2
189R. sargentianum ( Rhododendron, Pogonanthum, )2
190R. wrightianum var wrightianum ( Rhododendron, Vireya, Euvireya)2
191R. virgatum ssp virgatum ( Rhododendron, Rhododendron, Virgata)2
192R. anthopogon ssp anthopogon ( Rhododendron, Pogonanthum, )1
193R. dalhousiae var rhabdotum ( Rhododendron, Rhododendron, Maddenia)1
194R. traillianum var traillianum ( Hymenanthes, Pontica, Taliensia)1
195R. rigidum ( Rhododendron, Rhododendron, Triflora)1
196R. davidsonianum ( Rhododendron, Rhododendron, Triflora)1
197R. heliolepis var heliolepis ( Rhododendron, Rhododendron, Heliolepida)1
198R. dendrocharis ( Rhododendron, Rhododendron, Moupinensia)1
199R. adenogynum ( Hymenanthes, Pontica, Taliensia)1
200R. trichostomum ( Rhododendron, Pogonanthum, )1
201R. megeratum ( Rhododendron, Rhododendron, Boothia)1
202R. tapetiforme ( Rhododendron, Rhododendron, Lapponica)1
203R. sutchuenense ( Hymenanthes, Pontica, Fortunea)1
204R. morii ( Hymenanthes, Pontica, Maculifera)1
205R. ( , Pontica, Maculifera)1
206R. viscosum Serrulatum Group ( Pentanthera, Pentanthera, Pentanthera)1
207R. brookeanum ssp brookeanum ( Rhododendron, Vireya, Euvireya)1
208R. ( , Vireya, Euvireya)1
209R. colemanii ( Pentanthera, Pentanthera, Pentanthera)1
210R. mekongense var mekongense Viridescens Group ( Rhododendron, Rhododendron, Trichoclada)1
211R. hirsutum ( Rhododendron, Rhododendron, Rhododendron)1
212R. retivenium ( Rhododendron, Vireya, Euvireya)1
213R. concinnum ( Rhododendron, Rhododendron, Triflora)1
214R. serotinum ( Hymenanthes, Pontica, Fortunea)1
215R. simiarum ( Hymenanthes, Pontica, Argyrophylla)1
216R. arboreum ssp nilagiricum ( Hymenanthes, Pontica, Arborea)1
217R. dauricum Sempervirens Group ( Rhododendron, Rhododendron, Rhodorastra)1
218R. roxieanum var roxieanum ( Hymenanthes, Pontica, Taliensia)1
219R. hirtipes ( Hymenanthes, Pontica, Selensia)1
220R. proteoides ( Hymenanthes, Pontica, Taliensia)1
221R. edgarianum ( Rhododendron, Rhododendron, Lapponica)1
222R. microgynum Gymnocarpum Group ( Hymenanthes, Pontica, Neriiflora)1
223R. alabamense ( Pentanthera, Pentanthera, Pentanthera)1
224R. brachyanthum ssp hypolepidotum ( Rhododendron, Rhododendron, Glauca)1
225R. campylogynum Myrtilloides Group ( Rhododendron, Rhododendron, Campylogyna)1
226R. christi ( Rhododendron, Vireya, Euvireya)1
227R. bagobonum ( Rhododendron, Vireya, Euvireya)1
228R. arboreum ssp cinnamomeum var roseum ( Hymenanthes, Pontica, Arborea)1
229R. kawakamii ( Rhododendron, Pseudovireya, )1
230R. neriiflorum ssp neriiflorum Euchaites Group ( Hymenanthes, Pontica, Neriiflora)1
231R. campylogynum Cremastum Group ( Rhododendron, Rhododendron, Campylogyna)1
232R. luteiflorum ( Rhododendron, Rhododendron, Glauca)1
233R. veitchianum ( Rhododendron, Rhododendron, Maddenia)1
234R. kaempferi ( , , )1
235R. cerasinum ( Hymenanthes, Pontica, Thomsonia)1
236R. ferrugineum ( Rhododendron, Rhododendron, Rhododendron)1
237R. canescens ( Pentanthera, Pentanthera, Pentanthera)1
238R. rubiginosum ( Rhododendron, Rhododendron, Heliolepida)1
239R. tsariense ( Hymenanthes, Pontica, Lanata)1
240R. wardii var puralbum ( Hymenanthes, Pontica, Campylocarpa)1
241R. roxieanum var oreonastes ( Hymenanthes, Pontica, Taliensia)1
242R. arboreum ssp delavayi ( Hymenanthes, Pontica, Arborea)1
243R. reticulatum ( Tsutsusi, Brachycalyx, )1
244R. keiskei var ozawae ( Rhododendron, Rhododendron, Triflora)1
245R. anagalliflorum ( Rhododendron, Vireya, Euvireya)1
246R. catacosmum ( Hymenanthes, Pontica, Neriiflora)1
247R. cinnabarinum ssp cinnabarinum Blandfordiiflorum ( Rhododendron, Rhododendron, Cinnabarina)1
248R. arboreum ssp cinnamomeum ( Hymenanthes, Pontica, Arborea)1
249R. rubineiflorum ( Rhododendron, Vireya, Euvireya)1
250R. javanicum ssp gracile ( Rhododendron, Vireya, Euvireya)1
251R. arizelum ( Hymenanthes, Pontica, Falconera)1
252R. pachysanthum ( Hymenanthes, Pontica, Maculifera)1
253R. lepidotum ( Rhododendron, Rhododendron, Lepidota)1
254R. clementinae ( Hymenanthes, Pontica, Taliensia)1
255R. inconspicuum ( Rhododendron, Vireya, Euvireya)1
256R. culminicola var angiense ( Rhododendron, Vireya, Euvireya)1
257R. macrosepalum ( Tsutsusi, Tsutsusi, )1
258R. ririei ( Hymenanthes, Pontica, Argyrophylla)1
259R. arboreum Kingianum Group ( Hymenanthes, Pontica, Arborea)1
260R. veitchianum Cubittii Group ( Rhododendron, Rhododendron, Maddenia)1
261R. floribundum ( Hymenanthes, Pontica, Argyrophylla)1
262R. tschonoskii ( Tsutsusi, Tsutsusi, )1
263R. javanicum ssp teysmannii ( Rhododendron, Vireya, Euvireya)1
264R. magnificum ( Hymenanthes, Pontica, Grandia)1
265R. formosum var inaequale ( Rhododendron, Rhododendron, Maddenia)1
266R. degronianum ssp heptamerum ( Hymenanthes, Pontica, Pontica)1
267R. taggianum ( Rhododendron, Rhododendron, Maddenia)1
268R. ( , Rhododendron, Maddenia)1
269R. rupicola var muliense ( Rhododendron, Rhododendron, Lapponica)1
270R. argyrophyllum ssp nankingense ( Hymenanthes, Pontica, Argyrophylla)1
271R. wrightianum var cyclopense ( Rhododendron, Vireya, Euvireya)1
272R. glaucophyllum var glaucophyllum ( Rhododendron, Rhododendron, Glauca)1
273R. eclecteum var eclecteum ( Hymenanthes, Pontica, Thomsonia)1
274R. kyawii ( Hymenanthes, Pontica, Parishia)1
275R. selense ssp selense ( Hymenanthes, Pontica, Selensia)1
276R. mucronulatum var taquetii ( Rhododendron, Rhododendron, Rhodorastra)1
277R. sulfureum ( Rhododendron, Rhododendron, Boothia)1
278R. jasminiflorum ( , , )1
279R. multinervium ( Rhododendron, Vireya, Euvireya)1
280R. lapponicum ( Rhododendron, Rhododendron, Lapponica)1
281R. floccigerum ( Hymenanthes, Pontica, Neriiflora)1
282R. pulchrum ( Tsutsusi, Tsutsusi, )1
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