| Rhododendron ×arendsii Arends | | a | | Rhododendron arendsiiArends | |
| Rhododendron ×azaleodendron M. Vilm. & Bois | | a | | Rhododendron azaleodendronM. Vilm. & Bois | |
| Rhododendron camtschaticum Pall. | Therorhodion camtschaticum (Pall.) Small | | | Rhododendron camtschaticumPall. | Therorhodion camtschaticum(Pall.) Small |
| Rhododendron ×forsterianum hort. ex Rehder | | a | | Rhododendron forsterianumhort. ex Rehder | |
| Rhododendron ×fragrans Paxton | | a | | Rhododendron fragransPaxton | |
| Rhododendron ×gowenianum Sweet | Rhododendron hybr. | | | Rhododendron gowenianumSweet | Rhododendron hybr. |
| Rhododendron kamtschaticum Pall., orth. var. | Therorhodion camtschaticum (Pall.) Small | | | Rhododendron kamtschaticumPall., orth. var. | Therorhodion camtschaticum(Pall.) Small |
| Rhododendron ×loderi Millais | | a | | Rhododendron loderiMillais | |
| Rhododendron macrocarpum Van Houtte | | a | | Rhododendron macrocarpumVan Houtte | |
| Rhododendron macrostemon Maxim. | Rhododendron hybr. | | | Rhododendron macrostemonMaxim. | Rhododendron hybr. |
| Rhododendron ×pulchrum Sweet var. tebotan (Komatsu) Rehder | Rhododendron hybr. | | i | Rhododendron pulchrumSweet var.tebotan (Komatsu) Rehder | Rhododendron hybr. |
| Rhododendron ×taylorii Dean | Rhododendron hybr. | | | Rhododendron tayloriiDean | Rhododendron hybr. |
| Rhododendron tebotan Komatsu | Rhododendron hybr. | | | Rhododendron tebotanKomatsu | Rhododendron hybr. |
| Rhododendron ×viscosepalum Rehder | Rhododendron hybr. | | | Rhododendron viscosepalumRehder | Rhododendron hybr. |
| Rhododendron ×viscosepalum Rehder var. daviesii Rehder | Rhododendron hybr. | | i | Rhododendron viscosepalumRehder var.daviesii Rehder | Rhododendron hybr. |
| Rhododendron jenestierianum Forrest | | a | | Rhododendron jenestierianumForrest | |
| Rhododendron hybr. | | a | | Rhododendron hybr. | |
| Rhododendron spp. | | a | | Rhododendron spp. | |
| Rhododendron redowskianum Maxim. | Therorhodion redowskianum (Maxim.) Hutch. | | | Rhododendron redowskianumMaxim. | Therorhodion redowskianum(Maxim.) Hutch. |
| Rhododendron camtschaticum subsp. glandulosum | | a | i | Rhododendron camtschaticumsubsp. glandulosum | |
| Rhododendron chamberlainii Craven | Diplarche multiflora Hook. f. & Thomson | | | Rhododendron chamberlainiiCraven | Diplarche multifloraHook. f. & Thomson |
| Rhododendron chamaecistus L. | Rhodothamnus chamaecistus (L.) Rchb. | | | Rhododendron chamaecistusL. | Rhodothamnus chamaecistus(L.) Rchb. |
| Rhododendron ×coriifolium Sleumer | | a | | Rhododendron coriifoliumSleumer | |
| Rhododendron vitis-idaea Sleumer | | a | | Rhododendron vitis-idaeaSleumer | |
| Rhododendron jasminiflorum Hook. var. jasminiflorum | | a | i | Rhododendron jasminiflorumHook. var.jasminiflorum | |
| Rhododendron carringtoniae F. Muell. | | a | | Rhododendron carringtoniaeF. Muell. | |
| Rhododendron cruttwellii Sleumer | | a | | Rhododendron cruttwelliiSleumer | |
| Rhododendron laetum J. J. Sm. | | a | | Rhododendron laetumJ. J. Sm. | |
| Rhododendron lowii Hook. f. | | a | | Rhododendron lowiiHook. f. | |
| Rhododendron rugosum H. Low ex Hook. f. | | a | | Rhododendron rugosumH. Low ex Hook. f. | |
| Rhododendron rugosum H. Low ex Hook. f. var. coriifolium (Sleumer) Sleumer | Rhododendron ×coriifolium Sleumer | | i | Rhododendron rugosumH. Low ex Hook. f. var.coriifolium (Sleumer) Sleumer | Rhododendron coriifoliumSleumer |
| Rhododendron ericoides H. Low ex Hook. f. | | a | | Rhododendron ericoidesH. Low ex Hook. f. | |
| Rhododendron fallacinum Sleumer | | a | | Rhododendron fallacinumSleumer | |
| Rhododendron jasminiflorum Hook. var. punctatum Ridl. | | a | i | Rhododendron jasminiflorumHook. var.punctatum Ridl. | |
| Rhododendron zoelleri Warb. | | a | | Rhododendron zoelleriWarb. | |
| Rhododendron javanicum (Blume) Benn. var. schadenbergii (Warb.) Sleumer | | a | i | Rhododendron javanicum(Blume) Benn. var.schadenbergii (Warb.) Sleumer | |
| Rhododendron acuminatum Hook. f. | | a | | Rhododendron acuminatumHook. f. | |
| Rhododendron brookeanum H. Low ex Lindl. | | a | | Rhododendron brookeanumH. Low ex Lindl. | |
| Rhododendron buxifolium H. Low ex Hook. f. var. robustum Sleumer | | a | i | Rhododendron buxifoliumH. Low ex Hook. f. var.robustum Sleumer | |
| Rhododendron christianae Sleumer | | a | | Rhododendron christianaeSleumer | |
| Rhododendron vidalii Rolfe | | a | | Rhododendron vidaliiRolfe | |
| Rhododendron womersleyi Sleumer | | a | | Rhododendron womersleyiSleumer | |
| Rhododendron yelliotii Warb. | | a | | Rhododendron yelliotiiWarb. | |
| Rhododendron triumphans Yersin & A. Chev. | | a | | Rhododendron triumphansYersin & A. Chev. | |
| Rhododendron vaccinioides Hook. f. | | a | | Rhododendron vaccinioidesHook. f. | |
| Rhododendron vandeursenii Sleumer | Rhododendron vitis-idaea Sleumer | | | Rhododendron vandeurseniiSleumer | Rhododendron vitis-idaeaSleumer |
| Rhododendron superbum Sleumer | | a | | Rhododendron superbumSleumer | |
| Rhododendron retusum (Blume) Benn. | | a | | Rhododendron retusum(Blume) Benn. | |
| Rhododendron scabridibracteum Sleumer | | a | | Rhododendron scabridibracteumSleumer | |
| Rhododendron schadenbergii Warb. | Rhododendron javanicum (Blume) Benn. var. schadenbergii (Warb.) Sleumer | | | Rhododendron schadenbergiiWarb. | Rhododendron javanicum(Blume) Benn. var.schadenbergii (Warb.) Sleumer |
| Rhododendron rarum Schltr. | | a | | Rhododendron rarumSchltr. | |
| Rhododendron pleianthum Sleumer | | a | | Rhododendron pleianthumSleumer | |
| Rhododendron nummatum J. J. Sm. | | a | | Rhododendron nummatumJ. J. Sm. | |
| Rhododendron phaeochitum F. Muell. | | a | | Rhododendron phaeochitumF. Muell. | |
| Rhododendron maxwellii Gibbs | | a | | Rhododendron maxwelliiGibbs | |
| Rhododendron multicolor Miq. | | a | | Rhododendron multicolorMiq. | |
| Rhododendron multinervium Sleumer | | a | | Rhododendron multinerviumSleumer | |
| Rhododendron leptanthum F. Muell. | | a | | Rhododendron leptanthumF. Muell. | |
| Rhododendron macgregoriae F. Muell. | | a | | Rhododendron macgregoriaeF. Muell. | |
| Rhododendron lindaueanum Koord. | | a | | Rhododendron lindaueanumKoord. | |
| Rhododendron lochiae F. Muell. | | a | | Rhododendron lochiaeF. Muell. | |
| Rhododendron longiflorum Lindl. | | a | | Rhododendron longiflorumLindl. | |
| Rhododendron luteosquamatum Sleumer | | a | | Rhododendron luteosquamatumSleumer | |
| Rhododendron invasorium Sleumer | Rhododendron inconspicuum J. J. Sm. | | | Rhododendron invasoriumSleumer | Rhododendron inconspicuumJ. J. Sm. |
| Rhododendron kawakamii Hayata | | a | | Rhododendron kawakamiiHayata | |
| Rhododendron konori Becc. | | a | | Rhododendron konoriBecc. | |
| Rhododendron inconspicuum J. J. Sm. | | a | | Rhododendron inconspicuumJ. J. Sm. | |
| Rhododendron insculptum Hutch. & Kingdon-Ward | | a | | Rhododendron insculptumHutch. & Kingdon-Ward | |
| Rhododendron jasminiflorum Hook. | | a | | Rhododendron jasminiflorumHook. | |
| Rhododendron javanicum (Blume) Benn. | | a | | Rhododendron javanicum(Blume) Benn. | |
| Rhododendron gracilentum F. Muell. | | a | | Rhododendron gracilentumF. Muell. | |
| Rhododendron gaultheriifolium J. J. Sm. | | a | | Rhododendron gaultheriifoliumJ. J. Sm. | |
| Rhododendron hansemannii Warb. | Rhododendron macgregoriae F. Muell. | | | Rhododendron hansemanniiWarb. | Rhododendron macgregoriaeF. Muell. |
| Rhododendron herzogii Warb. | | a | | Rhododendron herzogiiWarb. | |
| Rhododendron dielsianum Schltr. | | a | | Rhododendron dielsianumSchltr. | |
| Rhododendron christii F. Forst. | | a | | Rhododendron christiiF. Forst. | |
| Rhododendron citrinum (Hassk.) Hassk. | | a | | Rhododendron citrinum(Hassk.) Hassk. | |
| Rhododendron commonae F. Forst. | | a | | Rhododendron commonaeF. Forst. | |
| Rhododendron culminicola F. Muell. | | a | | Rhododendron culminicolaF. Muell. | |
| Rhododendron beyerinckianum Koord. | | a | | Rhododendron beyerinckianumKoord. | |
| Rhododendron aurigeranum Sleumer | | a | | Rhododendron aurigeranumSleumer | |
| Rhododendron atropurpureum Sleumer | | a | | Rhododendron atropurpureumSleumer | |
| Rhododendron anagalliflorum Wernham | | a | | Rhododendron anagalliflorumWernham | |
| Rhododendron acraium Balf. f. & W. W. Sm. | Rhododendron primuliflorum Bureau & Franch. | | | Rhododendron acraiumBalf. f. & W. W. Sm. | Rhododendron primuliflorumBureau & Franch. |
| Rhododendron cephalanthum Franch. | | a | | Rhododendron cephalanthumFranch. | |
| Rhododendron chamaetortum Balf. f. & Kingdon-Ward | Rhododendron cephalanthum Franch. subsp. cephalanthum | | | Rhododendron chamaetortumBalf. f. & Kingdon-Ward | Rhododendron cephalanthumFranch. subsp. cephalanthum |
| Rhododendron clivicola Balf. f. & W. W. Sm. | Rhododendron primuliflorum Bureau & Franch. | | | Rhododendron clivicolaBalf. f. & W. W. Sm. | Rhododendron primuliflorumBureau & Franch. |
| Rhododendron crebreflorum Hutch. & Kingdon-Ward | Rhododendron cephalanthum Franch. subsp. cephalanthum | | | Rhododendron crebreflorumHutch. & Kingdon-Ward | Rhododendron cephalanthumFranch. subsp. cephalanthum |
| Rhododendron hypenanthum Balf. f. | Rhododendron anthopogon D. Don subsp. hypenanthum (Balf. f.) Cullen | | | Rhododendron hypenanthumBalf. f. | Rhododendron anthopogonD. Don subsp. hypenanthum (Balf. f.) Cullen |
| Rhododendron sargentianum Rehder & E. H. Wilson | | a | | Rhododendron sargentianumRehder & E. H. Wilson | |
| Rhododendron radinum Balf. f. & W. W. Sm. | Rhododendron trichostomum Franch. | | | Rhododendron radinumBalf. f. & W. W. Sm. | Rhododendron trichostomumFranch. |
| Rhododendron rufescens Franch. | | a | | Rhododendron rufescensFranch. | |
| Rhododendron anthopogon D. Don | | a | | Rhododendron anthopogonD. Don | |
| Rhododendron anthopogon D. Don subsp. anthopogon | | a | i | Rhododendron anthopogonD. Don subsp. anthopogon | |
| Rhododendron anthopogon D. Don subsp. hypenanthum (Balf. f.) Cullen | | a | i | Rhododendron anthopogonD. Don subsp. hypenanthum (Balf. f.) Cullen | |
| Rhododendron cephalanthum Franch. subsp. cephalanthum | | a | i | Rhododendron cephalanthumFranch. subsp. cephalanthum | |
| Rhododendron cephalanthum Franch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen | | a | i | Rhododendron cephalanthumFranch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen | |
| Rhododendron platyphyllum Balf. f. & W. W. Sm. | Rhododendron cephalanthum Franch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen | | | Rhododendron platyphyllumBalf. f. & W. W. Sm. | Rhododendron cephalanthumFranch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen |
| Rhododendron primuliflorum Bureau & Franch. | | a | | Rhododendron primuliflorumBureau & Franch. | |
| Rhododendron trichostomum Franch. | | a | | Rhododendron trichostomumFranch. | |
| Rhododendron glaucophyllum Rehder | | a | | Rhododendron glaucophyllumRehder | |
| Rhododendron subulatum (Nakai) Harmaja | | a | | Rhododendron subulatum(Nakai) Harmaja | |
| Rhododendron punctatum Andrews var. chapmanii Alph. Wood | Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | i | Rhododendron punctatumAndrews var.chapmanii Alph. Wood | Rhododendron minusMichx. var.chapmanii (Alph. Wood) W. H. Duncan & Pullen |
| Rhododendron hypoleucum (Kom.) Harmaja | | a | | Rhododendron hypoleucum(Kom.) Harmaja | |
| Rhododendron columbianum (Piper) Harmaja | | a | | Rhododendron columbianum(Piper) Harmaja | |
| Rhododendron tolmachevii Harmaja | | a | | Rhododendron tolmacheviiHarmaja | |
| Rhododendron neoglandulosum Harmaja | Rhododendron columbianum (Piper) Harmaja | | | Rhododendron neoglandulosumHarmaja | Rhododendron columbianum(Piper) Harmaja |
| Rhododendron tomentosum Harmaja subsp. subarcticum (Harmaja) G. D. Wallace | Rhododendron subarcticum Harmaja | | i | Rhododendron tomentosumHarmaja subsp. subarcticum (Harmaja) G. D. Wallace | Rhododendron subarcticumHarmaja |
| Rhododendron subarcticum Harmaja | | a | | Rhododendron subarcticumHarmaja | |
| Rhododendron tomentosum Harmaja subsp. tomentosum | Rhododendron tomentosum Harmaja | | i | Rhododendron tomentosumHarmaja subsp. tomentosum | Rhododendron tomentosumHarmaja |
| Rhododendron groenlandicum (Oeder) Kron & Judd | | a | | Rhododendron groenlandicum(Oeder) Kron & Judd | |
| Rhododendron sichotense Pojark. | | a | | Rhododendron sichotensePojark. | |
| Rhododendron palustre (L.) Kron & Judd | Rhododendron tomentosum Harmaja | | | Rhododendron palustre(L.) Kron & Judd | Rhododendron tomentosumHarmaja |
| Rhododendron mucronulatum Turcz. var. mucronulatum | | a | i | Rhododendron mucronulatumTurcz. var.mucronulatum | |
| Rhododendron tomentosum Harmaja | | a | | Rhododendron tomentosumHarmaja | |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | a | i | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | |
| Rhododendron keysii Nutt. | | a | | Rhododendron keysiiNutt. | |
| Rhododendron capitatum Maxim. | | a | | Rhododendron capitatumMaxim. | |
| Rhododendron mucronulatum Turcz. var. maritimum Nakai | | a | i | Rhododendron mucronulatumTurcz. var.maritimum Nakai | |
| Rhododendron diversipilosum (Nakai) Harmaja | | a | | Rhododendron diversipilosum(Nakai) Harmaja | |
| Rhododendron roylei Hook. f. | Rhododendron cinnabarinum Hook. f. subsp. cinnabarinum | | | Rhododendron royleiHook. f. | Rhododendron cinnabarinumHook. f. subsp. cinnabarinum |
| Rhododendron rubiginosum Franch. | | a | | Rhododendron rubiginosumFranch. | |
| Rhododendron rupicola W. W. Sm. | | a | | Rhododendron rupicolaW. W. Sm. | |
| Rhododendron russatum Balf. f. & Forrest | | a | | Rhododendron russatumBalf. f. & Forrest | |
| Rhododendron saluenense Franch. | | a | | Rhododendron saluenenseFranch. | |
| Rhododendron riparium Kingdon-Ward ex Hutch. | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | | Rhododendron ripariumKingdon-Ward ex Hutch. | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen |
| Rhododendron searsiae Rehder & E. H. Wilson | | a | | Rhododendron searsiaeRehder & E. H. Wilson | |
| Rhododendron seinghkuense Kingdon-Ward ex Hutch. | | a | | Rhododendron seinghkuenseKingdon-Ward ex Hutch. | |
| Rhododendron scintillans Balf. f. & W. W. Sm. | Rhododendron polycladum Franch. | | | Rhododendron scintillansBalf. f. & W. W. Sm. | Rhododendron polycladumFranch. |
| Rhododendron supranubium Hutch. | Rhododendron pachypodum Balf. f. & W. W. Sm. | | | Rhododendron supranubiumHutch. | Rhododendron pachypodumBalf. f. & W. W. Sm. |
| Rhododendron taggianum Hutch. | | a | | Rhododendron taggianumHutch. | |
| Rhododendron suberosum Balf. f. & Forrest | Rhododendron yunnanense Franch. | | | Rhododendron suberosumBalf. f. & Forrest | Rhododendron yunnanenseFranch. |
| Rhododendron telmateium Balf. f. & W. W. Sm. | | a | | Rhododendron telmateiumBalf. f. & W. W. Sm. | |
| Rhododendron tephropeplum Balf. f. & Forrest | | a | | Rhododendron tephropeplumBalf. f. & Forrest | |
| Rhododendron setosum D. Don | | a | | Rhododendron setosumD. Don | |
| Rhododendron siderophyllum Franch. | | a | | Rhododendron siderophyllumFranch. | |
| Rhododendron sinonuttallii Balf. f. & Forrest | Rhododendron nuttallii T. J. Booth ex Nutt. | | | Rhododendron sinonuttalliiBalf. f. & Forrest | Rhododendron nuttalliiT. J. Booth ex Nutt. |
| Rhododendron spinuliferum Franch. | | a | | Rhododendron spinuliferumFranch. | |
| Rhododendron oreotrephes W. W. Sm. | | a | | Rhododendron oreotrephesW. W. Sm. | |
| Rhododendron oulotrichum Balf. f. & Forrest | Rhododendron trichocladum Franch. | | | Rhododendron oulotrichumBalf. f. & Forrest | Rhododendron trichocladumFranch. |
| Rhododendron oleifolium Franch. | Rhododendron virgatum Hook. f. subsp. oleifolium (Franch.) Cullen | | | Rhododendron oleifoliumFranch. | Rhododendron virgatumHook. f. subsp. oleifolium (Franch.) Cullen |
| Rhododendron paludosum Hutch. & Kingdon-Ward | Rhododendron nivale Hook. f. subsp. nivale | | | Rhododendron paludosumHutch. & Kingdon-Ward | Rhododendron nivaleHook. f. subsp. nivale |
| Rhododendron parvifolium Adams | Rhododendron lapponicum (L.) Wahlenb. | | | Rhododendron parvifoliumAdams | Rhododendron lapponicum(L.) Wahlenb. |
| Rhododendron myrtilloides Balf. f. & Kingdon-Ward | Rhododendron campylogynum Franch. | | | Rhododendron myrtilloidesBalf. f. & Kingdon-Ward | Rhododendron campylogynumFranch. |
| Rhododendron ×praecox hort. | | a | | Rhododendron praecoxhort. | |
| Rhododendron prostratum W. W. Sm. | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | | Rhododendron prostratumW. W. Sm. | Rhododendron saluenenseFranch. subsp. chameunum (Balf. f. & Forrest) Cullen |
| Rhododendron pruniflorum Hutch. & Kingdon-Ward | | a | | Rhododendron pruniflorumHutch. & Kingdon-Ward | |
| Rhododendron pseudoyanthinum Balf. f. ex Hutch. | Rhododendron concinnum Hemsl. | | | Rhododendron pseudoyanthinumBalf. f. ex Hutch. | Rhododendron concinnumHemsl. |
| Rhododendron pubescens Balf. f. & Forrest | | a | | Rhododendron pubescensBalf. f. & Forrest | |
| Rhododendron ravum Balf. f. & W. W. Sm. | Rhododendron cuneatum W. W. Sm. | | | Rhododendron ravumBalf. f. & W. W. Sm. | Rhododendron cuneatumW. W. Sm. |
| Rhododendron pumilum Hook. f. | | a | | Rhododendron pumilumHook. f. | |
| Rhododendron punctatum Andrews | Rhododendron minus Michx. var. minus | | | Rhododendron punctatumAndrews | Rhododendron minusMichx. var.minus |
| Rhododendron racemosum Franch. | | a | | Rhododendron racemosumFranch. | |
| Rhododendron radicans Balf. f. & Forrest | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | | Rhododendron radicansBalf. f. & Forrest | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen |
| Rhododendron veitchianum Hook. | | a | | Rhododendron veitchianumHook. | |
| Rhododendron valentinianum Forrest ex Hutch. | | a | | Rhododendron valentinianumForrest ex Hutch. | |
| Rhododendron triflorum Hook. f. | | a | | Rhododendron triflorumHook. f. | |
| Rhododendron timeteum Balf. f. & Forrest | Rhododendron oreotrephes W. W. Sm. | | | Rhododendron timeteumBalf. f. & Forrest | Rhododendron oreotrephesW. W. Sm. |
| Rhododendron trichocladum Franch. | | a | | Rhododendron trichocladumFranch. | |
| Rhododendron yungningense Balf. f. ex Hutch. | | a | | Rhododendron yungningenseBalf. f. ex Hutch. | |
| Rhododendron yunnanense Franch. | | a | | Rhododendron yunnanenseFranch. | |
| Rhododendron vilmorinianum Balf. f. | Rhododendron augustinii Hemsl. subsp. augustinii | | | Rhododendron vilmorinianumBalf. f. | Rhododendron augustiniiHemsl. subsp. augustinii |
| Rhododendron virgatum Hook. f. | | a | | Rhododendron virgatumHook. f. | |
| Rhododendron yanthinum Bureau & Franch. | Rhododendron concinnum Hemsl. | | | Rhododendron yanthinumBureau & Franch. | Rhododendron concinnumHemsl. |
| Rhododendron carolinianum Rehder | Rhododendron minus Michx. var. minus | | | Rhododendron carolinianumRehder | Rhododendron minusMichx. var.minus |
| Rhododendron minus Michx. var. minus | | a | i | Rhododendron minusMichx. var.minus | |
| Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | a | i | Rhododendron minusMichx. var.chapmanii (Alph. Wood) W. H. Duncan & Pullen | |
| Rhododendron cinnabarinum Hook. f. subsp. cinnabarinum | | a | i | Rhododendron cinnabarinumHook. f. subsp. cinnabarinum | |
| Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | a | i | Rhododendron cinnabarinumHook. f. subsp. xanthocodon (Hutch.) Cullen | |
| Rhododendron uniflorum Kingdon-Ward var. imperator (Kingdon-Ward) Cullen | | a | i | Rhododendron uniflorumKingdon-Ward var.imperator (Kingdon-Ward) Cullen | |
| Rhododendron imperator Kingdon-Ward | Rhododendron uniflorum Kingdon-Ward var. imperator (Kingdon-Ward) Cullen | | | Rhododendron imperatorKingdon-Ward | Rhododendron uniflorumKingdon-Ward var.imperator (Kingdon-Ward) Cullen |
| Rhododendron ludlowii Cowan | | a | | Rhododendron ludlowiiCowan | |
| Rhododendron pemakoense Kingdon-Ward | | a | | Rhododendron pemakoenseKingdon-Ward | |
| Rhododendron dalhousieae Hook. f. var. rhabdotum (Balf. f. & R. E. Cooper) Cullen | | a | i | Rhododendron dalhousieaeHook. f. var.rhabdotum (Balf. f. & R. E. Cooper) Cullen | |
| Rhododendron rhabdotum Balf. f. & R. E. Cooper | Rhododendron dalhousieae Hook. f. var. rhabdotum (Balf. f. & R. E. Cooper) Cullen | | | Rhododendron rhabdotumBalf. f. & R. E. Cooper | Rhododendron dalhousieaeHook. f. var.rhabdotum (Balf. f. & R. E. Cooper) Cullen |
| Rhododendron polycladum Franch. | | a | | Rhododendron polycladumFranch. | |
| Rhododendron xanthocodon Hutch. | Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | | Rhododendron xanthocodonHutch. | Rhododendron cinnabarinumHook. f. subsp. xanthocodon (Hutch.) Cullen |
| Rhododendron zaleucum Balf. f. & W. W. Sm. | | a | | Rhododendron zaleucumBalf. f. & W. W. Sm. | |
| Rhododendron maddenii Hook. f. subsp. maddenii | | a | i | Rhododendron maddeniiHook. f. subsp. maddenii | |
| Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | a | i | Rhododendron maddeniiHook. f. subsp. crassum (Franch.) Cullen | |
| Rhododendron nuttallii T. J. Booth ex Nutt. | | a | | Rhododendron nuttalliiT. J. Booth ex Nutt. | |
| Rhododendron dalhousieae Hook. f. var. dalhousieae | | a | i | Rhododendron dalhousieaeHook. f. var.dalhousieae | |
| Rhododendron formosum Wall. var. formosum | | a | i | Rhododendron formosumWall. var.formosum | |
| Rhododendron formosum Wall. | | a | | Rhododendron formosumWall. | |
| Rhododendron formosum Wall. var. johnstoneanum Brandis | Rhododendron johnstoneanum (Brandis) G. Watt ex Hutch. | | i | Rhododendron formosumWall. var.johnstoneanum Brandis | Rhododendron johnstoneanum(Brandis) G. Watt ex Hutch. |
| Rhododendron pachypodum Balf. f. & W. W. Sm. | | a | | Rhododendron pachypodumBalf. f. & W. W. Sm. | |
| Rhododendron rigidum Franch. | | a | | Rhododendron rigidumFranch. | |
| Rhododendron augustinii Hemsl. subsp. augustinii | | a | i | Rhododendron augustiniiHemsl. subsp. augustinii | |
| Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | a | i | Rhododendron augustiniiHemsl. subsp. chasmanthum (Diels) Cullen | |
| Rhododendron augustinii Hemsl. subsp. rubrum (Davidian) Cullen | | a | i | Rhododendron augustiniiHemsl. subsp. rubrum (Davidian) Cullen | |
| Rhododendron augustinii Hemsl. subsp. hardyi (Davidian) Cullen | | a | i | Rhododendron augustiniiHemsl. subsp. hardyi (Davidian) Cullen | |
| Rhododendron chasmanthum Diels | Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | | Rhododendron chasmanthumDiels | Rhododendron augustiniiHemsl. subsp. chasmanthum (Diels) Cullen |
| Rhododendron hardyi Davidian | Rhododendron augustinii Hemsl. subsp. hardyi (Davidian) Cullen | | | Rhododendron hardyiDavidian | Rhododendron augustiniiHemsl. subsp. hardyi (Davidian) Cullen |
| Rhododendron rubrum Davidian | Rhododendron augustinii Hemsl. subsp. rubrum (Davidian) Cullen | | | Rhododendron rubrumDavidian | Rhododendron augustiniiHemsl. subsp. rubrum (Davidian) Cullen |
| Rhododendron heliolepis Franch. var. heliolepis | | a | i | Rhododendron heliolepisFranch. var.heliolepis | |
| Rhododendron heliolepis Franch. var. brevistylum (Franch.) Cullen | | a | i | Rhododendron heliolepisFranch. var.brevistylum (Franch.) Cullen | |
| Rhododendron nivale Hook. f. | | a | | Rhododendron nivaleHook. f. | |
| Rhododendron nivale Hook. f. subsp. nivale | | a | i | Rhododendron nivaleHook. f. subsp. nivale | |
| Rhododendron nivale Hook. f. subsp. boreale Philipson & M. N. Philipson | | a | i | Rhododendron nivaleHook. f. subsp. boreale Philipson & M. N. Philipson | |
| Rhododendron nivale Hook. f. subsp. australe Philipson & M. N. Philipson | | a | i | Rhododendron nivaleHook. f. subsp. australe Philipson & M. N. Philipson | |
| Rhododendron rupicola W. W. Sm. var. rupicola | | a | i | Rhododendron rupicolaW. W. Sm. var.rupicola | |
| Rhododendron rupicola W. W. Sm. var. chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson | | a | i | Rhododendron rupicolaW. W. Sm. var.chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson | |
| Rhododendron rupicola W. W. Sm. var. muliense (Balf. f. & Forrest) Philipson & M. N. Philipson | | a | i | Rhododendron rupicolaW. W. Sm. var.muliense (Balf. f. & Forrest) Philipson & M. N. Philipson | |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | a | i | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparioides Cullen | | a | i | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. riparioides Cullen | |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. calostrotum | | a | i | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. calostrotum | |
| Rhododendron keleticum Balf. f. & Forrest | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | | Rhododendron keleticumBalf. f. & Forrest | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen |
| Rhododendron saluenense Franch. subsp. saluenense | | a | i | Rhododendron saluenenseFranch. subsp. saluenense | |
| Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | a | i | Rhododendron saluenenseFranch. subsp. chameunum (Balf. f. & Forrest) Cullen | |
| Rhododendron uniflorum Kingdon-Ward var. uniflorum | | a | i | Rhododendron uniflorumKingdon-Ward var.uniflorum | |
| Rhododendron uniflorum Kingdon-Ward | | a | | Rhododendron uniflorumKingdon-Ward | |
| Rhododendron cinnabarinum Hook. f. subsp. tamaense (Davidian) Cullen | | a | i | Rhododendron cinnabarinumHook. f. subsp. tamaense (Davidian) Cullen | |
| Rhododendron tamaense Davidian | Rhododendron cinnabarinum Hook. f. subsp. tamaense (Davidian) Cullen | | | Rhododendron tamaenseDavidian | Rhododendron cinnabarinumHook. f. subsp. tamaense (Davidian) Cullen |
| Rhododendron virgatum Hook. f. subsp. virgatum | | a | i | Rhododendron virgatumHook. f. subsp. virgatum | |
| Rhododendron virgatum Hook. f. subsp. oleifolium (Franch.) Cullen | | a | i | Rhododendron virgatumHook. f. subsp. oleifolium (Franch.) Cullen | |
| Rhododendron leptocarpum Nutt. | | a | | Rhododendron leptocarpumNutt. | |
| Rhododendron boothii Nutt. | | a | | Rhododendron boothiiNutt. | |
| Rhododendron brachyanthum Franch. subsp. brachyanthum | | a | i | Rhododendron brachyanthumFranch. subsp. brachyanthum | |
| Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | a | i | Rhododendron brachyanthumFranch. subsp. hypolepidotum (Franch.) Cullen | |
| Rhododendron hypolepidotum (Franch.) Balf. f. & Forrest | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | | Rhododendron hypolepidotum(Franch.) Balf. f. & Forrest | Rhododendron brachyanthumFranch. subsp. hypolepidotum (Franch.) Cullen |
| Rhododendron impeditum Balf. f. & W. W. Sm. | | a | | Rhododendron impeditumBalf. f. & W. W. Sm. | |
| Rhododendron inaequale (C. B. Clarke) Hutch. | Rhododendron formosum Wall. var. inaequale C. B. Clarke | | | Rhododendron inaequale(C. B. Clarke) Hutch. | Rhododendron formosumWall. var.inaequale C. B. Clarke |
| Rhododendron hippophaeoides Balf. f. & W. W. Sm. | | a | | Rhododendron hippophaeoidesBalf. f. & W. W. Sm. | |
| Rhododendron hirsutum L. | | a | | Rhododendron hirsutumL. | |
| Rhododendron hemitrichotum Balf. f. & Forrest | | a | | Rhododendron hemitrichotumBalf. f. & Forrest | |
| Rhododendron heliolepis Franch. | | a | | Rhododendron heliolepisFranch. | |
| Rhododendron genestierianum Forrest | | a | | Rhododendron genestierianumForrest | |
| Rhododendron ×fragrantissimum Burb. ex Rehder | | a | | Rhododendron fragrantissimumBurb. ex Rehder | |
| Rhododendron johnstoneanum (Brandis) G. Watt ex Hutch. | | a | | Rhododendron johnstoneanum(Brandis) G. Watt ex Hutch. | |
| Rhododendron iteaphyllum Hutch. | Rhododendron formosum Wall. var. formosum | | | Rhododendron iteaphyllumHutch. | Rhododendron formosumWall. var.formosum |
| Rhododendron glomerulatum Hutch. | Rhododendron yungningense Balf. f. ex Hutch. | | | Rhododendron glomerulatumHutch. | Rhododendron yungningenseBalf. f. ex Hutch. |
| Rhododendron intricatum Franch. | | a | | Rhododendron intricatumFranch. | |
| Rhododendron kasoense Hutch. & Kingdon-Ward | | a | | Rhododendron kasoenseHutch. & Kingdon-Ward | |
| Rhododendron lapponicum (L.) Wahlenb. | | a | | Rhododendron lapponicum(L.) Wahlenb. | |
| Rhododendron keiskei Miq. | | a | | Rhododendron keiskeiMiq. | |
| Rhododendron lutescens Franch. | | a | | Rhododendron lutescensFranch. | |
| Rhododendron camelliiflorum Hook. f. | | a | | Rhododendron camelliiflorumHook. f. | |
| Rhododendron dalhousieae Hook. f. | | a | | Rhododendron dalhousieaeHook. f. | |
| Rhododendron lowndesii Davidian | | a | | Rhododendron lowndesiiDavidian | |
| Rhododendron lindleyi T. Moore | | a | | Rhododendron lindleyiT. Moore | |
| Rhododendron lepidotum Wall. ex G. Don | | a | | Rhododendron lepidotumWall. ex G. Don | |
| Rhododendron leucaspis Tagg | | a | | Rhododendron leucaspisTagg | |
| Rhododendron ×lysolepis Hutch. | | a | | Rhododendron lysolepisHutch. | |
| Rhododendron longistylum Rehder & E. H. Wilson | | a | | Rhododendron longistylumRehder & E. H. Wilson | |
| Rhododendron lepidostylum Balf. f. & Forrest | | a | | Rhododendron lepidostylumBalf. f. & Forrest | |
| Rhododendron litangense Balf. f. ex Hutch. | Rhododendron impeditum Balf. f. & W. W. Sm. | | | Rhododendron litangenseBalf. f. ex Hutch. | Rhododendron impeditumBalf. f. & W. W. Sm. |
| Rhododendron brachyanthum Franch. | | a | | Rhododendron brachyanthumFranch. | |
| Rhododendron brachyanthum Franch. var. hypolepidotum Franch. | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | i | Rhododendron brachyanthumFranch. var.hypolepidotum Franch. | Rhododendron brachyanthumFranch. subsp. hypolepidotum (Franch.) Cullen |
| Rhododendron mucronulatum Turcz. | | a | | Rhododendron mucronulatumTurcz. | |
| Rhododendron mucronulatum Turcz. var. ciliatum Nakai | | a | i | Rhododendron mucronulatumTurcz. var.ciliatum Nakai | |
| Rhododendron muliense Balf. f. & Forrest | Rhododendron rupicola W. W. Sm. var. muliense (Balf. f. & Forrest) Philipson & M. N. Philipson | | | Rhododendron mulienseBalf. f. & Forrest | Rhododendron rupicolaW. W. Sm. var.muliense (Balf. f. & Forrest) Philipson & M. N. Philipson |
| Rhododendron mollicomum Balf. f. & W. W. Sm. | | a | | Rhododendron mollicomumBalf. f. & W. W. Sm. | |
| Rhododendron moupinense Franch. | | a | | Rhododendron moupinenseFranch. | |
| Rhododendron micranthum Turcz. | | a | | Rhododendron micranthumTurcz. | |
| Rhododendron micromeres Tagg | Rhododendron leptocarpum Nutt. | | | Rhododendron micromeresTagg | Rhododendron leptocarpumNutt. |
| Rhododendron minus Michx. | | a | | Rhododendron minusMichx. | |
| Rhododendron mishmiense Hutch. & Kingdon-Ward | Rhododendron boothii Nutt. | | | Rhododendron mishmienseHutch. & Kingdon-Ward | Rhododendron boothiiNutt. |
| Rhododendron maddenii Hook. f. | | a | | Rhododendron maddeniiHook. f. | |
| Rhododendron manipurense Balf. f. & G. Watt | Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | | Rhododendron manipurenseBalf. f. & G. Watt | Rhododendron maddeniiHook. f. subsp. crassum (Franch.) Cullen |
| Rhododendron megacalyx Balf. f. & Kingdon-Ward | | a | | Rhododendron megacalyxBalf. f. & Kingdon-Ward | |
| Rhododendron megeratum Balf. f. & Forrest | | a | | Rhododendron megeratumBalf. f. & Forrest | |
| Rhododendron cubittii Hutch. | Rhododendron veitchianum Hook. | | | Rhododendron cubittiiHutch. | Rhododendron veitchianumHook. |
| Rhododendron cosmetum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | | Rhododendron cosmetumBalf. f. & Forrest | Rhododendron saluenenseFranch. subsp. chameunum (Balf. f. & Forrest) Cullen |
| Rhododendron crassum Franch. | Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | | Rhododendron crassumFranch. | Rhododendron maddeniiHook. f. subsp. crassum (Franch.) Cullen |
| Rhododendron cuneatum W. W. Sm. | | a | | Rhododendron cuneatumW. W. Sm. | |
| Rhododendron dasypetalum Balf. f. & Forrest | | a | | Rhododendron dasypetalumBalf. f. & Forrest | |
| Rhododendron dauricum L. | | a | | Rhododendron dauricumL. | |
| Rhododendron dauricum L. var. mucronulatum (Turcz.) Maxim. | Rhododendron mucronulatum Turcz. var. mucronulatum | | i | Rhododendron dauricumL. var.mucronulatum (Turcz.) Maxim. | Rhododendron mucronulatumTurcz. var.mucronulatum |
| Rhododendron davidsonianum Rehder & E. H. Wilson | | a | | Rhododendron davidsonianumRehder & E. H. Wilson | |
| Rhododendron concatenans Hutch. | Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | | Rhododendron concatenansHutch. | Rhododendron cinnabarinumHook. f. subsp. xanthocodon (Hutch.) Cullen |
| Rhododendron concinnum Hemsl. | | a | | Rhododendron concinnumHemsl. | |
| Rhododendron campylogynum Franch. | | a | | Rhododendron campylogynumFranch. | |
| Rhododendron chryseum Balf. f. & Kingdon-Ward | Rhododendron rupicola W. W. Sm. var. chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson | | | Rhododendron chryseumBalf. f. & Kingdon-Ward | Rhododendron rupicolaW. W. Sm. var.chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson |
| Rhododendron chrysodoron Tagg ex Hutch. | | a | | Rhododendron chrysodoronTagg ex Hutch. | |
| Rhododendron chrysolepis Hutch. & Kingdon-Ward | | a | | Rhododendron chrysolepisHutch. & Kingdon-Ward | |
| Rhododendron ciliatum Hook. f. | | a | | Rhododendron ciliatumHook. f. | |
| Rhododendron ciliicalyx Franch. | | a | | Rhododendron ciliicalyxFranch. | |
| Rhododendron cinnabarinum Hook. f. | | a | | Rhododendron cinnabarinumHook. f. | |
| Rhododendron cuffeanum Craib ex Hutch. | | a | | Rhododendron cuffeanumCraib ex Hutch. | |
| Rhododendron deleiense Hutch. & Kingdon-Ward | Rhododendron tephropeplum Balf. f. & Forrest | | | Rhododendron deleienseHutch. & Kingdon-Ward | Rhododendron tephropeplumBalf. f. & Forrest |
| Rhododendron dendricola Hutch. | | a | | Rhododendron dendricolaHutch. | |
| Rhododendron desquamatum Balf. f. & Forrest | Rhododendron rubiginosum Franch. | | | Rhododendron desquamatumBalf. f. & Forrest | Rhododendron rubiginosumFranch. |
| Rhododendron drumonium Balf. f. & Kingdon-Ward | Rhododendron telmateium Balf. f. & W. W. Sm. | | | Rhododendron drumoniumBalf. f. & Kingdon-Ward | Rhododendron telmateiumBalf. f. & W. W. Sm. |
| Rhododendron edgarianum Rehder & E. H. Wilson | | a | | Rhododendron edgarianumRehder & E. H. Wilson | |
| Rhododendron edgeworthii Hook. f. | | a | | Rhododendron edgeworthiiHook. f. | |
| Rhododendron formosum Wall. var. inaequale C. B. Clarke | | a | i | Rhododendron formosumWall. var.inaequale C. B. Clarke | |
| Rhododendron fastigiatum Franch. | | a | | Rhododendron fastigiatumFranch. | |
| Rhododendron exquisitum Hutch. | Rhododendron oreotrephes W. W. Sm. | | | Rhododendron exquisitumHutch. | Rhododendron oreotrephesW. W. Sm. |
| Rhododendron ferrugineum L. | | a | | Rhododendron ferrugineumL. | |
| Rhododendron chameunum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | | Rhododendron chameunumBalf. f. & Forrest | Rhododendron saluenenseFranch. subsp. chameunum (Balf. f. & Forrest) Cullen |
| Rhododendron chapmanii (Alph. Wood) A. Gray | Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | | Rhododendron chapmanii(Alph. Wood) A. Gray | Rhododendron minusMichx. var.chapmanii (Alph. Wood) W. H. Duncan & Pullen |
| Rhododendron charitopes Balf. f. & Farrer | | a | | Rhododendron charitopesBalf. f. & Farrer | |
| Rhododendron charitostreptum Balf. f. & Kingdon-Ward | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | | Rhododendron charitostreptumBalf. f. & Kingdon-Ward | Rhododendron brachyanthumFranch. subsp. hypolepidotum (Franch.) Cullen |
| Rhododendron chartophyllum Franch. | Rhododendron yunnanense Franch. | | | Rhododendron chartophyllumFranch. | Rhododendron yunnanenseFranch. |
| Rhododendron chasmanthoides Balf. f. & Forrest | Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | | Rhododendron chasmanthoidesBalf. f. & Forrest | Rhododendron augustiniiHemsl. subsp. chasmanthum (Diels) Cullen |
| Rhododendron cantabile Balf. f. ex Hutch. | Rhododendron russatum Balf. f. & Forrest | | | Rhododendron cantabileBalf. f. ex Hutch. | Rhododendron russatumBalf. f. & Forrest |
| Rhododendron carneum Hutch. | | a | | Rhododendron carneumHutch. | |
| Rhododendron brevistylum Franch. | Rhododendron heliolepis Franch. var. brevistylum (Franch.) Cullen | | | Rhododendron brevistylumFranch. | Rhododendron heliolepisFranch. var.brevistylum (Franch.) Cullen |
| Rhododendron bullatum Franch. | Rhododendron edgeworthii Hook. f. | | | Rhododendron bullatumFranch. | Rhododendron edgeworthiiHook. f. |
| Rhododendron burmanicum Hutch. | | a | | Rhododendron burmanicumHutch. | |
| Rhododendron caeruleum H. Lev. | Rhododendron rigidum Franch. | | | Rhododendron caeruleumH. Lev. | Rhododendron rigidumFranch. |
| Rhododendron calciphilum Hutch. & Kingdon-Ward | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | | Rhododendron calciphilumHutch. & Kingdon-Ward | Rhododendron calostrotumBalf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward | | a | | Rhododendron calostrotumBalf. f. & Kingdon-Ward | |
| Rhododendron adamsii Rehder | | a | | Rhododendron adamsiiRehder | |
| Rhododendron achroanthum Balf. f. & W. W. Sm. | Rhododendron rupicola W. W. Sm. var. rupicola | | | Rhododendron achroanthumBalf. f. & W. W. Sm. | Rhododendron rupicolaW. W. Sm. var.rupicola |
| Rhododendron artosquameum Balf. f. & Forrest | Rhododendron oreotrephes W. W. Sm. | | | Rhododendron artosquameumBalf. f. & Forrest | Rhododendron oreotrephesW. W. Sm. |
| Rhododendron amaurophyllum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. saluenense | | | Rhododendron amaurophyllumBalf. f. & Forrest | Rhododendron saluenenseFranch. subsp. saluenense |
| Rhododendron ambiguum Hemsl. | | a | | Rhododendron ambiguumHemsl. | |
| Rhododendron auritum Tagg | | a | | Rhododendron auritumTagg | |
| Rhododendron augustinii Hemsl. | | a | | Rhododendron augustiniiHemsl. | |
| Rhododendron baileyi Balf. f. | | a | | Rhododendron baileyiBalf. f. | |
| Rhododendron bainbridgeanum Tagg & Forrest | | a | | Rhododendron bainbridgeanumTagg & Forrest | |
| Rhododendron balfourianum Diels | | a | | Rhododendron balfourianumDiels | |
| Rhododendron balfourianum Diels var. aganniphoides Tagg & Forrest | Rhododendron balfourianum Diels | | i | Rhododendron balfourianumDiels var.aganniphoides Tagg & Forrest | Rhododendron balfourianumDiels |
| Rhododendron auriculatum Hemsl. | | a | | Rhododendron auriculatumHemsl. | |
| Rhododendron argyrophyllum Franch. | | a | | Rhododendron argyrophyllumFranch. | |
| Rhododendron arizelum Balf. f. & Forrest | | a | | Rhododendron arizelumBalf. f. & Forrest | |
| Rhododendron aucklandii Hook. f. | Rhododendron griffithianum Wight | | | Rhododendron aucklandiiHook. f. | Rhododendron griffithianumWight |
| Rhododendron aberconwayi Cowan | | a | | Rhododendron aberconwayiCowan | |
| Rhododendron albertsenianum Forrest | | a | | Rhododendron albertsenianumForrest | |
| Rhododendron aperantum Balf. f. & Kingdon-Ward | | a | | Rhododendron aperantumBalf. f. & Kingdon-Ward | |
| Rhododendron araiophyllum Balf. f. & W. W. Sm. | | a | | Rhododendron araiophyllumBalf. f. & W. W. Sm. | |
| Rhododendron araliiforme Balf. f. & Forrest | Rhododendron vernicosum Franch. | | | Rhododendron araliiformeBalf. f. & Forrest | Rhododendron vernicosumFranch. |
| Rhododendron arboreum Sm. | | a | | Rhododendron arboreumSm. | |
| Rhododendron arboreum Sm. var. campbelliae (Hook. f.) C. B. Clarke | Rhododendron arboreum Sm. subsp. cinnamomeum (Lindl.) Tagg var. cinnamomeum Lindl. | | i | Rhododendron arboreumSm. var.campbelliae (Hook. f.) C. B. Clarke | Rhododendron arboreumSm. subsp. cinnamomeum (Lindl.) Tagg var.cinnamomeum Lindl. |
| Rhododendron arboreum Sm. var. nilagiricum (Zenker) C. B. Clarke | Rhododendron arboreum Sm. subsp. nilagiricum (Zenker) Tagg | | i | Rhododendron arboreumSm. var.nilagiricum (Zenker) C. B. Clarke | Rhododendron arboreumSm. subsp. nilagiricum (Zenker) Tagg |
| Rhododendron adenogynum Diels | | a | | Rhododendron adenogynumDiels | |
| Rhododendron adenophorum Balf. f. & W. W. Sm. | Rhododendron adenogynum Diels | | | Rhododendron adenophorumBalf. f. & W. W. Sm. | Rhododendron adenogynumDiels |
| Rhododendron aganniphum Balf. f. & Kingdon-Ward | | a | | Rhododendron aganniphumBalf. f. & Kingdon-Ward | |
| Rhododendron agastum Balf. f. & W. W. Sm. | | a | | Rhododendron agastumBalf. f. & W. W. Sm. | |
| Rhododendron agglutinatum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. agglutinatum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron agglutinatumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.agglutinatum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron aiolopeplum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. levistratum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron aiolopeplumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.levistratum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron caloxanthum Balf. f. & Farrer | Rhododendron campylocarpum Hook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. | | | Rhododendron caloxanthumBalf. f. & Farrer | Rhododendron campylocarpumHook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. |
| Rhododendron campanulatum D. Don | | a | | Rhododendron campanulatumD. Don | |
| Rhododendron campanulatum D. Don var. wallichii (Hook. f.) Hook. f. | Rhododendron wallichii Hook. f. | | i | Rhododendron campanulatumD. Don var.wallichii (Hook. f.) Hook. f. | Rhododendron wallichiiHook. f. |
| Rhododendron campbelliae Hook. f. | Rhododendron arboreum Sm. subsp. cinnamomeum (Lindl.) Tagg var. cinnamomeum Lindl. | | | Rhododendron campbelliaeHook. f. | Rhododendron arboreumSm. subsp. cinnamomeum (Lindl.) Tagg var.cinnamomeum Lindl. |
| Rhododendron campylocarpum Hook. f. | | a | | Rhododendron campylocarpumHook. f. | |
| Rhododendron californicum Hook. | Rhododendron macrophyllum D. Don ex G. Don | | | Rhododendron californicumHook. | Rhododendron macrophyllumD. Don ex G. Don |
| Rhododendron callimorphum Balf. f. & W. W. Sm. | | a | | Rhododendron callimorphumBalf. f. & W. W. Sm. | |
| Rhododendron calophytum Franch. | | a | | Rhododendron calophytumFranch. | |
| Rhododendron bureavii Franch. | | a | | Rhododendron bureaviiFranch. | |
| Rhododendron brunneifolium Balf. f. & Forrest | Rhododendron eudoxum Balf. f. & Forrest var. brunneifolium (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron brunneifoliumBalf. f. & Forrest | Rhododendron eudoxumBalf. f. & Forrest var.brunneifolium (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron barbatum Wall. ex G. Don | | a | | Rhododendron barbatumWall. ex G. Don | |
| Rhododendron basilicum Balf. f. & W. W. Sm. | | a | | Rhododendron basilicumBalf. f. & W. W. Sm. | |
| Rhododendron beesianum Diels | | a | | Rhododendron beesianumDiels | |
| Rhododendron beimaense Balf. f. & Forrest | Rhododendron ×erythrocalyx Balf. f. & Forrest | | | Rhododendron beimaenseBalf. f. & Forrest | Rhododendron erythrocalyxBalf. f. & Forrest |
| Rhododendron catacosmum Balf. f. ex Tagg | | a | | Rhododendron catacosmumBalf. f. ex Tagg | |
| Rhododendron catawbiense Michx. | | a | | Rhododendron catawbienseMichx. | |
| Rhododendron caucasicum Pall. | | a | | Rhododendron caucasicumPall. | |
| Rhododendron cerasinum Tagg | | a | | Rhododendron cerasinumTagg | |
| Rhododendron chaetomallum Balf. f. & Forrest | Rhododendron haematodes Franch. subsp. chaetomallum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron chaetomallumBalf. f. & Forrest | Rhododendron haematodesFranch. subsp. chaetomallum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron chalarocladum Balf. f. & Forrest | Rhododendron selense Franch. subsp. selense | | | Rhododendron chalarocladumBalf. f. & Forrest | Rhododendron selenseFranch. subsp. selense |
| Rhododendron fictolacteum Balf. f. | Rhododendron rex H. Lev. subsp. fictolacteum (Balf. f.) D. F. Chamb. | | | Rhododendron fictolacteumBalf. f. | Rhododendron rexH. Lev. subsp. fictolacteum (Balf. f.) D. F. Chamb. |
| Rhododendron flavorufum Balf. f. & Forrest | Rhododendron aganniphum Balf. f. & Kingdon-Ward var. flavorufum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron flavorufumBalf. f. & Forrest | Rhododendron aganniphumBalf. f. & Kingdon-Ward var.flavorufum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron facetum Balf. f. & Kingdon-Ward | | a | | Rhododendron facetumBalf. f. & Kingdon-Ward | |
| Rhododendron falconeri Hook. f. | | a | | Rhododendron falconeriHook. f. | |
| Rhododendron fargesii Franch. | Rhododendron oreodoxa Franch. var. fargesii (Franch.) D. F. Chamb. | | | Rhododendron fargesiiFranch. | Rhododendron oreodoxaFranch. var.fargesii (Franch.) D. F. Chamb. |
| Rhododendron fauriei Franch. | Rhododendron brachycarpum D. Don ex G. Don | | | Rhododendron faurieiFranch. | Rhododendron brachycarpumD. Don ex G. Don |
| Rhododendron floccigerum Franch. | | a | | Rhododendron floccigerumFranch. | |
| Rhododendron formosanum Hemsl. | | a | | Rhododendron formosanumHemsl. | |
| Rhododendron forrestii Balf. f. ex Diels | | a | | Rhododendron forrestiiBalf. f. ex Diels | |
| Rhododendron fortunei Lindl. | | a | | Rhododendron fortuneiLindl. | |
| Rhododendron elliottii G. Watt | | a | | Rhododendron elliottiiG. Watt | |
| Rhododendron eudoxum Balf. f. & Forrest | | a | | Rhododendron eudoxumBalf. f. & Forrest | |
| Rhododendron exasperatum Tagg | | a | | Rhododendron exasperatumTagg | |
| Rhododendron eximium Nutt. | Rhododendron falconeri Hook. f. subsp. eximium (Nutt.) D. F. Chamb. | | | Rhododendron eximiumNutt. | Rhododendron falconeriHook. f. subsp. eximium (Nutt.) D. F. Chamb. |
| Rhododendron dryophyllum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. phaeochrysum | | | Rhododendron dryophyllumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.phaeochrysum |
| Rhododendron dumosulum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. agglutinatum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron dumosulumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.agglutinatum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron eclecteum Balf. f. & Forrest | | a | | Rhododendron eclecteumBalf. f. & Forrest | |
| Rhododendron eclecteum Balf. f. & Forrest var. bellatulum Tagg | | a | i | Rhododendron eclecteumBalf. f. & Forrest var.bellatulum Tagg | |
| Rhododendron dichroanthum Diels | | a | | Rhododendron dichroanthumDiels | |
| Rhododendron dictyotum Balf. f. ex Tagg | Rhododendron traillianum Forrest & W. W. Sm. var. dictyotum (Balf. f. ex Tagg) D. F. Chamb. | | | Rhododendron dictyotumBalf. f. ex Tagg | Rhododendron traillianumForrest & W. W. Sm. var.dictyotum (Balf. f. ex Tagg) D. F. Chamb. |
| Rhododendron didymum Balf. f. & Forrest | Rhododendron sanguineum Franch. var. didymum (Balf. f. & Forrest) T. L. Ming | | | Rhododendron didymumBalf. f. & Forrest | Rhododendron sanguineumFranch. var.didymum (Balf. f. & Forrest) T. L. Ming |
| Rhododendron discolor Franch. | Rhododendron fortunei Lindl. subsp. discolor (Franch.) D. F. Chamb. | | | Rhododendron discolorFranch. | Rhododendron fortuneiLindl. subsp. discolor (Franch.) D. F. Chamb. |
| Rhododendron citriniflorum Balf. f. & Forrest | | a | | Rhododendron citriniflorumBalf. f. & Forrest | |
| Rhododendron clementinae Forrest | | a | | Rhododendron clementinaeForrest | |
| Rhododendron coriaceum Franch. | | a | | Rhododendron coriaceumFranch. | |
| Rhododendron coryanum Tagg & Forrest | | a | | Rhododendron coryanumTagg & Forrest | |
| Rhododendron coryphaeum Balf. f. & Forrest | Rhododendron praestans Balf. f. & W. W. Sm. | | | Rhododendron coryphaeumBalf. f. & Forrest | Rhododendron praestansBalf. f. & W. W. Sm. |
| Rhododendron dasycladum Balf. f. & W. W. Sm. | Rhododendron selense Franch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. | | | Rhododendron dasycladumBalf. f. & W. W. Sm. | Rhododendron selenseFranch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. |
| Rhododendron decorum Franch. | | a | | Rhododendron decorumFranch. | |
| Rhododendron degronianum Carriere | | a | | Rhododendron degronianumCarriere | |
| Rhododendron delavayi Franch. | Rhododendron arboreum Sm. subsp. delavayi (Franch.) D. F. Chamb. | | | Rhododendron delavayiFranch. | Rhododendron arboreumSm. subsp. delavayi (Franch.) D. F. Chamb. |
| Rhododendron cloiophorum Balf. f. & Forrest | Rhododendron sanguineum Franch. var. cloiophorum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron cloiophorumBalf. f. & Forrest | Rhododendron sanguineumFranch. var.cloiophorum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron colletum Balf. f. & Forrest | Rhododendron beesianum Diels | | | Rhododendron colletumBalf. f. & Forrest | Rhododendron beesianumDiels |
| Rhododendron cucullatum Hand.-Mazz. | Rhododendron roxieanum Forrest var. cucullatum (Hand.-Mazz.) D. F. Chamb. | | | Rhododendron cucullatumHand.-Mazz. | Rhododendron roxieanumForrest var.cucullatum (Hand.-Mazz.) D. F. Chamb. |
| Rhododendron crinigerum Franch. | | a | | Rhododendron crinigerumFranch. | |
| Rhododendron croceum Balf. f. & W. W. Sm. | Rhododendron wardii W. W. Sm. var. wardii | | | Rhododendron croceumBalf. f. & W. W. Sm. | Rhododendron wardiiW. W. Sm. var.wardii |
| Rhododendron mesopolium Balf. f. & Forrest | Rhododendron eudoxum Balf. f. & Forrest var. mesopolium (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron mesopoliumBalf. f. & Forrest | Rhododendron eudoxumBalf. f. & Forrest var.mesopolium (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron metternichii Siebold & Zucc. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | | Rhododendron metternichiiSiebold & Zucc. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian |
| Rhododendron metternichii Siebold & Zucc. var. kyomaruense T. Yamaz. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. kyomaruense (T. Yamaz.) H. Hara | | i | Rhododendron metternichiiSiebold & Zucc. var.kyomaruense T. Yamaz. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.kyomaruense (T. Yamaz.) H. Hara |
| Rhododendron metternichii Siebold & Zucc. var. pentamerum Maxim. | Rhododendron degronianum Carriere subsp. degronianum | | i | Rhododendron metternichiiSiebold & Zucc. var.pentamerum Maxim. | Rhododendron degronianumCarriere subsp. degronianum |
| Rhododendron metternichii Siebold & Zucc. subsp. pentamerum (Maxim.) Sugim. | Rhododendron degronianum Carriere subsp. degronianum | | i | Rhododendron metternichiiSiebold & Zucc. subsp. pentamerum (Maxim.) Sugim. | Rhododendron degronianumCarriere subsp. degronianum |
| Rhododendron metternichii Siebold & Zucc. subsp. yakushimanum (Nakai) Sugim. | Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. yakushimanum (Nakai) Kitam. | | i | Rhododendron metternichiiSiebold & Zucc. subsp. yakushimanum (Nakai) Sugim. | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.yakushimanum (Nakai) Kitam. |
| Rhododendron martinianum Balf. f. & Forrest | | a | | Rhododendron martinianumBalf. f. & Forrest | |
| Rhododendron maximum L. | | a | | Rhododendron maximumL. | |
| Rhododendron makinoi Tagg ex Nakai | | a | | Rhododendron makinoiTagg ex Nakai | |
| Rhododendron macrophyllum D. Don ex G. Don | | a | | Rhododendron macrophyllumD. Don ex G. Don | |
| Rhododendron mimetes Tagg & Forrest | | a | | Rhododendron mimetesTagg & Forrest | |
| Rhododendron mimetes Tagg & Forrest var. simulans Tagg & Forrest | | a | i | Rhododendron mimetesTagg & Forrest var.simulans Tagg & Forrest | |
| Rhododendron morii Hayata | | a | | Rhododendron moriiHayata | |
| Rhododendron myiagrum Balf. f. & Forrest | Rhododendron callimorphum Balf. f. & W. W. Sm. var. myiagrum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron myiagrumBalf. f. & Forrest | Rhododendron callimorphumBalf. f. & W. W. Sm. var.myiagrum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron litiense Balf. f. & Forrest | Rhododendron wardii W. W. Sm. var. wardii | | | Rhododendron litienseBalf. f. & Forrest | Rhododendron wardiiW. W. Sm. var.wardii |
| Rhododendron eriogynum Balf. f. & W. W. Sm. | Rhododendron facetum Balf. f. & Kingdon-Ward | | | Rhododendron eriogynumBalf. f. & W. W. Sm. | Rhododendron facetumBalf. f. & Kingdon-Ward |
| Rhododendron eritimum Balf. f. & W. W. Sm. | Rhododendron anthosphaerum Diels | | | Rhododendron eritimumBalf. f. & W. W. Sm. | Rhododendron anthosphaerumDiels |
| Rhododendron ×erythrocalyx Balf. f. & Forrest | | a | | Rhododendron erythrocalyxBalf. f. & Forrest | |
| Rhododendron euchaites Balf. f. & Forrest | Rhododendron neriiflorum Franch. subsp. neriiflorum | | | Rhododendron euchaitesBalf. f. & Forrest | Rhododendron neriiflorumFranch. subsp. neriiflorum |
| Rhododendron kyawi Lace & W. W. Sm. | | a | | Rhododendron kyawiLace & W. W. Sm. | |
| Rhododendron macabeanum G. Watt ex Balf. f. | | a | | Rhododendron macabeanumG. Watt ex Balf. f. | |
| Rhododendron levistratum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. levistratum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron levistratumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.levistratum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron lucidum Franch. | Rhododendron vernicosum Franch. | | | Rhododendron lucidumFranch. | Rhododendron vernicosumFranch. |
| Rhododendron lukiangense Franch. | | a | | Rhododendron lukiangenseFranch. | |
| Rhododendron brachyandrum Balf. f. & Forrest | Rhododendron eclecteum Balf. f. & Forrest var. eclecteum | | | Rhododendron brachyandrumBalf. f. & Forrest | Rhododendron eclecteumBalf. f. & Forrest var.eclecteum |
| Rhododendron irroratum Franch. | | a | | Rhododendron irroratumFranch. | |
| Rhododendron lacteum Franch. | | a | | Rhododendron lacteumFranch. | |
| Rhododendron lanatum Hook. f. | | a | | Rhododendron lanatumHook. f. | |
| Rhododendron lanigerum Tagg | | a | | Rhododendron lanigerumTagg | |
| Rhododendron insigne Hemsl. & E. H. Wilson | | a | | Rhododendron insigneHemsl. & E. H. Wilson | |
| Rhododendron ixeuticum Balf. f. & W. W. Sm. | Rhododendron crinigerum Franch. | | | Rhododendron ixeuticumBalf. f. & W. W. Sm. | Rhododendron crinigerumFranch. |
| Rhododendron fulgens Hook. f. | | a | | Rhododendron fulgensHook. f. | |
| Rhododendron ×fulvastrum Balf. f. & Forrest | | a | | Rhododendron fulvastrumBalf. f. & Forrest | |
| Rhododendron fulvoides Balf. f. & Forrest | Rhododendron fulvum Balf. f. & W. W. Sm. | | | Rhododendron fulvoidesBalf. f. & Forrest | Rhododendron fulvumBalf. f. & W. W. Sm. |
| Rhododendron fulvum Balf. f. & W. W. Sm. | | a | | Rhododendron fulvumBalf. f. & W. W. Sm. | |
| Rhododendron galactinum Balf. f. ex Tagg | | a | | Rhododendron galactinumBalf. f. ex Tagg | |
| Rhododendron glischrum Balf. f. & W. W. Sm. | | a | | Rhododendron glischrumBalf. f. & W. W. Sm. | |
| Rhododendron globigerum Balf. f. & Forrest | Rhododendron alutaceum Balf. f. & W. W. Sm. var. alutaceum | | | Rhododendron globigerumBalf. f. & Forrest | Rhododendron alutaceumBalf. f. & W. W. Sm. var.alutaceum |
| Rhododendron grande Wight | | a | | Rhododendron grandeWight | |
| Rhododendron griersonianum Balf. f. & Forrest | | a | | Rhododendron griersonianumBalf. f. & Forrest | |
| Rhododendron griffithianum Wight | | a | | Rhododendron griffithianumWight | |
| Rhododendron gymnanthum Diels | Rhododendron lukiangense Franch. | | | Rhododendron gymnanthumDiels | Rhododendron lukiangenseFranch. |
| Rhododendron gymnogynum Balf. f. & Forrest | Rhododendron anthosphaerum Diels | | | Rhododendron gymnogynumBalf. f. & Forrest | Rhododendron anthosphaerumDiels |
| Rhododendron habrotrichum Balf. f. & W. W. Sm. | | a | | Rhododendron habrotrichumBalf. f. & W. W. Sm. | |
| Rhododendron haemaleum Balf. f. & Forrest | Rhododendron sanguineum Franch. var. haemaleum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron haemaleumBalf. f. & Forrest | Rhododendron sanguineumFranch. var.haemaleum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron haematodes Franch. | | a | | Rhododendron haematodesFranch. | |
| Rhododendron hemidartum Balf. f. ex Tagg | Rhododendron pocophorum Balf. f. ex Tagg var. hemidartum (Balf. f. ex Tagg) D. F. Chamb. | | | Rhododendron hemidartumBalf. f. ex Tagg | Rhododendron pocophorumBalf. f. ex Tagg var.hemidartum (Balf. f. ex Tagg) D. F. Chamb. |
| Rhododendron hardingii Forrest ex Tagg | Rhododendron annae Franch. | | | Rhododendron hardingiiForrest ex Tagg | Rhododendron annaeFranch. |
| Rhododendron heptamerum Balf. f. | Rhododendron anthosphaerum Diels | | | Rhododendron heptamerumBalf. f. | Rhododendron anthosphaerumDiels |
| Rhododendron himertum Balf. f. & Forrest | Rhododendron sanguineum Franch. var. himertum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron himertumBalf. f. & Forrest | Rhododendron sanguineumFranch. var.himertum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron hodgsonii Hook. f. | | a | | Rhododendron hodgsoniiHook. f. | |
| Rhododendron horaeum Balf. f. & Forrest | Rhododendron citriniflorum Balf. f. & Forrest var. horaeum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron horaeumBalf. f. & Forrest | Rhododendron citriniflorumBalf. f. & Forrest var.horaeum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron hylaeum Balf. f. & Farrer | | a | | Rhododendron hylaeumBalf. f. & Farrer | |
| Rhododendron hylothreptum Balf. f. & W. W. Sm. | Rhododendron anthosphaerum Diels | | | Rhododendron hylothreptumBalf. f. & W. W. Sm. | Rhododendron anthosphaerumDiels |
| Rhododendron hymenanthes Makino | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | | Rhododendron hymenanthesMakino | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian |
| Rhododendron hyperythrum Hayata | | a | | Rhododendron hyperythrumHayata | |
| Rhododendron purdomii Rehder & E. H. Wilson | | a | | Rhododendron purdomiiRehder & E. H. Wilson | |
| Rhododendron ×nikomontanum (Komatsu) Nakai | | a | | Rhododendron nikomontanum(Komatsu) Nakai | |
| Rhododendron brachycarpum D. Don ex G. Don | | a | | Rhododendron brachycarpumD. Don ex G. Don | |
| Rhododendron brachycarpum D. Don ex G. Don subsp. fauriei (Franch.) D. F. Chamb. | Rhododendron brachycarpum D. Don ex G. Don | | i | Rhododendron brachycarpumD. Don ex G. Don subsp. fauriei (Franch.) D. F. Chamb. | Rhododendron brachycarpumD. Don ex G. Don |
| Rhododendron chrysanthum Pall. var. nikomontanum Komatsu | Rhododendron ×nikomontanum (Komatsu) Nakai | | i | Rhododendron chrysanthumPall. var.nikomontanum Komatsu | Rhododendron nikomontanum(Komatsu) Nakai |
| Rhododendron arboreum Sm. subsp. cinnamomeum (Lindl.) Tagg var. cinnamomeum Lindl. | | a | i | Rhododendron arboreumSm. subsp. cinnamomeum (Lindl.) Tagg var.cinnamomeum Lindl. | |
| Rhododendron campylocarpum Hook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. | | a | i | Rhododendron campylocarpumHook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. | |
| Rhododendron campylocarpum Hook. f. subsp. campylocarpum | | a | i | Rhododendron campylocarpumHook. f. subsp. campylocarpum | |
| Rhododendron decorum Franch. subsp. diaprepes (Balf. f. & W. W. Sm.) T. L. Ming | | a | i | Rhododendron decorumFranch. subsp. diaprepes (Balf. f. & W. W. Sm.) T. L. Ming | |
| Rhododendron decorum Franch. subsp. decorum | | a | i | Rhododendron decorumFranch. subsp. decorum | |
| Rhododendron diaprepes Balf. f. & W. W. Sm. | Rhododendron decorum Franch. subsp. diaprepes (Balf. f. & W. W. Sm.) T. L. Ming | | | Rhododendron diaprepesBalf. f. & W. W. Sm. | Rhododendron decorumFranch. subsp. diaprepes (Balf. f. & W. W. Sm.) T. L. Ming |
| Rhododendron falconeri Hook. f. subsp. eximium (Nutt.) D. F. Chamb. | | a | i | Rhododendron falconeriHook. f. subsp. eximium (Nutt.) D. F. Chamb. | |
| Rhododendron falconeri Hook. f. subsp. falconeri | | a | i | Rhododendron falconeriHook. f. subsp. falconeri | |
| Rhododendron oreodoxa Franch. var. oreodoxa | | a | i | Rhododendron oreodoxaFranch. var.oreodoxa | |
| Rhododendron rex H. Lev. subsp. rex | | a | i | Rhododendron rexH. Lev. subsp. rex | |
| Rhododendron rex H. Lev. subsp. fictolacteum (Balf. f.) D. F. Chamb. | | a | i | Rhododendron rexH. Lev. subsp. fictolacteum (Balf. f.) D. F. Chamb. | |
| Rhododendron protistum Balf. f. & Forrest var. protistum | | a | i | Rhododendron protistumBalf. f. & Forrest var.protistum | |
| Rhododendron protistum Balf. f. & Forrest var. giganteum (Tagg) D. F. Chamb. | | a | i | Rhododendron protistumBalf. f. & Forrest var.giganteum (Tagg) D. F. Chamb. | |
| Rhododendron giganteum Tagg | Rhododendron protistum Balf. f. & Forrest var. giganteum (Tagg) D. F. Chamb. | | | Rhododendron giganteumTagg | Rhododendron protistumBalf. f. & Forrest var.giganteum (Tagg) D. F. Chamb. |
| Rhododendron houlstonii Hemsl. & E. H. Wilson | Rhododendron fortunei Lindl. subsp. discolor (Franch.) D. F. Chamb. | | | Rhododendron houlstoniiHemsl. & E. H. Wilson | Rhododendron fortuneiLindl. subsp. discolor (Franch.) D. F. Chamb. |
| Rhododendron magnificum Kingdon-Ward | | a | | Rhododendron magnificumKingdon-Ward | |
| Rhododendron aureum Georgi | | a | | Rhododendron aureumGeorgi | |
| Rhododendron fortunei Lindl. subsp. discolor (Franch.) D. F. Chamb. | | a | i | Rhododendron fortuneiLindl. subsp. discolor (Franch.) D. F. Chamb. | |
| Rhododendron oreodoxa Franch. var. fargesii (Franch.) D. F. Chamb. | | a | i | Rhododendron oreodoxaFranch. var.fargesii (Franch.) D. F. Chamb. | |
| Rhododendron yakushimanum Nakai subsp. makinoi (Tagg ex Nakai) D. F. Chamb. | Rhododendron makinoi Tagg ex Nakai | | i | Rhododendron yakushimanumNakai subsp. makinoi (Tagg ex Nakai) D. F. Chamb. | Rhododendron makinoiTagg ex Nakai |
| Rhododendron japonicum (Blume) C. K. Schneid. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | | Rhododendron japonicum(Blume) C. K. Schneid. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian |
| Rhododendron metternichii Siebold & Zucc. var. yakushimanum (Nakai) Ohwi | Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. yakushimanum (Nakai) Kitam. | | i | Rhododendron metternichiiSiebold & Zucc. var.yakushimanum (Nakai) Ohwi | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.yakushimanum (Nakai) Kitam. |
| Rhododendron chrysanthum Pall. | Rhododendron aureum Georgi | | | Rhododendron chrysanthumPall. | Rhododendron aureumGeorgi |
| Rhododendron eclecteum Balf. f. & Forrest var. brachyandrum (Balf. f. & Forrest) Cowan & Davidian | Rhododendron eclecteum Balf. f. & Forrest var. eclecteum | | i | Rhododendron eclecteumBalf. f. & Forrest var.brachyandrum (Balf. f. & Forrest) Cowan & Davidian | Rhododendron eclecteumBalf. f. & Forrest var.eclecteum |
| Rhododendron brachycarpum D. Don ex G. Don var. lutescens Koidz. | Rhododendron ×nikomontanum (Komatsu) Nakai | | i | Rhododendron brachycarpumD. Don ex G. Don var.lutescens Koidz. | Rhododendron nikomontanum(Komatsu) Nakai |
| Rhododendron brachycarpum D. Don ex G. Don subsp. tigerstedtii Nitz. | Rhododendron brachycarpum D. Don ex G. Don | | i | Rhododendron brachycarpumD. Don ex G. Don subsp. tigerstedtii Nitz. | Rhododendron brachycarpumD. Don ex G. Don |
| Rhododendron wardii W. W. Sm. | | a | | Rhododendron wardiiW. W. Sm. | |
| Rhododendron wasonii Hemsl. & E. H. Wilson | | a | | Rhododendron wasoniiHemsl. & E. H. Wilson | |
| Rhododendron zeylanicum T. J. Booth | Rhododendron arboreum Sm. subsp. zeylanicum (T. J. Booth) Tagg | | | Rhododendron zeylanicumT. J. Booth | Rhododendron arboreumSm. subsp. zeylanicum (T. J. Booth) Tagg |
| Rhododendron yakushimanum Nakai | Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. yakushimanum (Nakai) Kitam. | | | Rhododendron yakushimanumNakai | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.yakushimanum (Nakai) Kitam. |
| Rhododendron wightii Hook. f. | | a | | Rhododendron wightiiHook. f. | |
| Rhododendron williamsianum Rehder & E. H. Wilson | | a | | Rhododendron williamsianumRehder & E. H. Wilson | |
| Rhododendron trichomiscum Balf. f. & Forrest | Rhododendron eudoxum Balf. f. & Forrest var. eudoxum | | | Rhododendron trichomiscumBalf. f. & Forrest | Rhododendron eudoxumBalf. f. & Forrest var.eudoxum |
| Rhododendron triplonaevium Balf. f. & Forrest | Rhododendron alutaceum Balf. f. & W. W. Sm. var. russotinctum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron triplonaeviumBalf. f. & Forrest | Rhododendron alutaceumBalf. f. & W. W. Sm. var.russotinctum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron tritifolium Balf. f. & Forrest | Rhododendron alutaceum Balf. f. & W. W. Sm. var. russotinctum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron tritifoliumBalf. f. & Forrest | Rhododendron alutaceumBalf. f. & W. W. Sm. var.russotinctum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron traillianum Forrest & W. W. Sm. | | a | | Rhododendron traillianumForrest & W. W. Sm. | |
| Rhododendron ungernii Trautv. | | a | | Rhododendron ungerniiTrautv. | |
| Rhododendron vernicosum Franch. | | a | | Rhododendron vernicosumFranch. | |
| Rhododendron vesiculiferum Tagg | | a | | Rhododendron vesiculiferumTagg | |
| Rhododendron przewalskii Maxim. | | a | | Rhododendron przewalskiiMaxim. | |
| Rhododendron pseudochrysanthum Hayata | | a | | Rhododendron pseudochrysanthumHayata | |
| Rhododendron recurvoides Tagg & Kingdon-Ward | | a | | Rhododendron recurvoidesTagg & Kingdon-Ward | |
| Rhododendron recurvum Balf. f. & Forrest | Rhododendron roxieanum Forrest var. roxieanum | | | Rhododendron recurvumBalf. f. & Forrest | Rhododendron roxieanumForrest var.roxieanum |
| Rhododendron recurvum Balf. f. & Forrest var. oreonastes Balf. f. & Forrest | Rhododendron roxieanum Forrest var. oreonastes (Balf. f. & Forrest) T. L. Ming | | i | Rhododendron recurvumBalf. f. & Forrest var.oreonastes Balf. f. & Forrest | Rhododendron roxieanumForrest var.oreonastes (Balf. f. & Forrest) T. L. Ming |
| Rhododendron repens Balf. f. & Forrest | Rhododendron forrestii Balf. f. ex Diels subsp. forrestii | | | Rhododendron repensBalf. f. & Forrest | Rhododendron forrestiiBalf. f. ex Diels subsp. forrestii |
| Rhododendron repens Balf. f. & Forrest var. chamaedoron Tagg | Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaedoron (Tagg) D. F. Chamb. | | i | Rhododendron repensBalf. f. & Forrest var.chamaedoron Tagg | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaedoron (Tagg) D. F. Chamb. |
| Rhododendron repens Balf. f. & Forrest var. chamaethomsonii Tagg | Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaethomsonii | | i | Rhododendron repensBalf. f. & Forrest var.chamaethomsonii Tagg | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaethomsonii |
| Rhododendron proteoides Balf. f. & W. W. Sm. | | a | | Rhododendron proteoidesBalf. f. & W. W. Sm. | |
| Rhododendron protistum Balf. f. & Forrest | | a | | Rhododendron protistumBalf. f. & Forrest | |
| Rhododendron praestans Balf. f. & W. W. Sm. | | a | | Rhododendron praestansBalf. f. & W. W. Sm. | |
| Rhododendron praevernum Hutch. | | a | | Rhododendron praevernumHutch. | |
| Rhododendron probum Balf. f. & Forrest | Rhododendron selense Franch. subsp. selense | | | Rhododendron probumBalf. f. & Forrest | Rhododendron selenseFranch. subsp. selense |
| Rhododendron pronum Tagg & Forrest | | a | | Rhododendron pronumTagg & Forrest | |
| Rhododendron pocophorum Balf. f. ex Tagg | | a | | Rhododendron pocophorumBalf. f. ex Tagg | |
| Rhododendron poecilodermum Balf. f. & Forrest | Rhododendron roxieanum Forrest var. roxieanum | | | Rhododendron poecilodermumBalf. f. & Forrest | Rhododendron roxieanumForrest var.roxieanum |
| Rhododendron ponticum L. | | a | | Rhododendron ponticumL. | |
| Rhododendron niveum Hook. f. | | a | | Rhododendron niveumHook. f. | |
| Rhododendron neriiflorum Franch. | | a | | Rhododendron neriiflorumFranch. | |
| Rhododendron nilagiricum Zenker | Rhododendron arboreum Sm. subsp. nilagiricum (Zenker) Tagg | | | Rhododendron nilagiricumZenker | Rhododendron arboreumSm. subsp. nilagiricum (Zenker) Tagg |
| Rhododendron niphargum Balf. f. & Kingdon-Ward | Rhododendron uvarifolium Diels | | | Rhododendron niphargumBalf. f. & Kingdon-Ward | Rhododendron uvarifoliumDiels |
| Rhododendron orbiculare Decne. | | a | | Rhododendron orbiculareDecne. | |
| Rhododendron oreodoxa Franch. | | a | | Rhododendron oreodoxaFranch. | |
| Rhododendron pagophilum Balf. f. & Kingdon-Ward | Rhododendron selense Franch. subsp. selense | | | Rhododendron pagophilumBalf. f. & Kingdon-Ward | Rhododendron selenseFranch. subsp. selense |
| Rhododendron planetum Balf. f. | | a | | Rhododendron planetumBalf. f. | |
| Rhododendron phaeochrysum Balf. f. & W. W. Sm. | | a | | Rhododendron phaeochrysumBalf. f. & W. W. Sm. | |
| Rhododendron sidereum Balf. f. | | a | | Rhododendron sidereumBalf. f. | |
| Rhododendron sinogrande Balf. f. & W. W. Sm. | | a | | Rhododendron sinograndeBalf. f. & W. W. Sm. | |
| Rhododendron smirnowii Trautv. | | a | | Rhododendron smirnowiiTrautv. | |
| Rhododendron ×smithii Sweet | | a | | Rhododendron smithiiSweet | |
| Rhododendron souliei Franch. | | a | | Rhododendron soulieiFranch. | |
| Rhododendron sperabile Balf. f. & Farrer | | a | | Rhododendron sperabileBalf. f. & Farrer | |
| Rhododendron sphaeroblastum Balf. f. & Forrest | | a | | Rhododendron sphaeroblastumBalf. f. & Forrest | |
| Rhododendron sigillatum Balf. f. & Forrest | Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. levistratum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron sigillatumBalf. f. & Forrest | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.levistratum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron simiarum Hance | | a | | Rhododendron simiarumHance | |
| Rhododendron rufum Batalin | | a | | Rhododendron rufumBatalin | |
| Rhododendron setiferum Balf. f. & Forrest | Rhododendron selense Franch. subsp. setiferum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron setiferumBalf. f. & Forrest | Rhododendron selenseFranch. subsp. setiferum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron thomsonii Hook. f. | | a | | Rhododendron thomsoniiHook. f. | |
| Rhododendron tanastylum Balf. f. & Kingdon-Ward | | a | | Rhododendron tanastylumBalf. f. & Kingdon-Ward | |
| Rhododendron telopeum Balf. f. & Forrest | Rhododendron campylocarpum Hook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. | | | Rhododendron telopeumBalf. f. & Forrest | Rhododendron campylocarpumHook. f. subsp. caloxanthum (Balf. f. & Farrer) D. F. Chamb. |
| Rhododendron temenium Balf. f. & Forrest | | a | | Rhododendron temeniumBalf. f. & Forrest | |
| Rhododendron stewartianum Diels | | a | | Rhododendron stewartianumDiels | |
| Rhododendron strigillosum Franch. | | a | | Rhododendron strigillosumFranch. | |
| Rhododendron taliense Franch. | | a | | Rhododendron talienseFranch. | |
| Rhododendron sutchuenense Franch. | | a | | Rhododendron sutchuenenseFranch. | |
| Rhododendron scyphocalyx Balf. f. & Forrest | Rhododendron dichroanthum Diels subsp. scyphocalyx (Balf. f. & Forrest) Cowan | | | Rhododendron scyphocalyxBalf. f. & Forrest | Rhododendron dichroanthumDiels subsp. scyphocalyx (Balf. f. & Forrest) Cowan |
| Rhododendron serpens Balf. f. & Forrest | Rhododendron erastum Balf. f. & Forrest | | | Rhododendron serpensBalf. f. & Forrest | Rhododendron erastumBalf. f. & Forrest |
| Rhododendron selense Franch. | | a | | Rhododendron selenseFranch. | |
| Rhododendron sanguineum Franch. | | a | | Rhododendron sanguineumFranch. | |
| Rhododendron sanguineum Franch. subsp. melleum Cowan | Rhododendron sanguineum Franch. var. himertum (Balf. f. & Forrest) D. F. Chamb. | | i | Rhododendron sanguineumFranch. subsp. melleum Cowan | Rhododendron sanguineumFranch. var.himertum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron schizopeplum Balf. f. & Forrest | Rhododendron aganniphum Balf. f. & Kingdon-Ward var. aganniphum | | | Rhododendron schizopeplumBalf. f. & Forrest | Rhododendron aganniphumBalf. f. & Kingdon-Ward var.aganniphum |
| Rhododendron roxieanum Forrest | | a | | Rhododendron roxieanumForrest | |
| Rhododendron rex H. Lev. | | a | | Rhododendron rexH. Lev. | |
| Rhododendron rhaibocarpum Balf. f. & W. W. Sm. | Rhododendron selense Franch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. | | | Rhododendron rhaibocarpumBalf. f. & W. W. Sm. | Rhododendron selenseFranch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. |
| Rhododendron russotinctum Balf. f. & Forrest | Rhododendron alutaceum Balf. f. & W. W. Sm. var. russotinctum (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron russotinctumBalf. f. & Forrest | Rhododendron alutaceumBalf. f. & W. W. Sm. var.russotinctum (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron argyrophyllum Franch. subsp. argyrophyllum | | a | i | Rhododendron argyrophyllumFranch. subsp. argyrophyllum | |
| Rhododendron argyrophyllum Franch. subsp. hypoglaucum (Hemsl.) D. F. Chamb. | | a | i | Rhododendron argyrophyllumFranch. subsp. hypoglaucum (Hemsl.) D. F. Chamb. | |
| Rhododendron hypoglaucum Hemsl. | Rhododendron argyrophyllum Franch. subsp. hypoglaucum (Hemsl.) D. F. Chamb. | | | Rhododendron hypoglaucumHemsl. | Rhododendron argyrophyllumFranch. subsp. hypoglaucum (Hemsl.) D. F. Chamb. |
| Rhododendron ×wellesleyanum Waterer ex Rehder | | a | | Rhododendron wellesleyanumWaterer ex Rehder | |
| Rhododendron chamaethomsonii (Tagg) Cowan & Davidian | | a | | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian | |
| Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara | | a | i | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara | |
| Rhododendron dichroanthum Diels subsp. apodectum (Balf. f. & W. W. Sm.) Cowan | | a | i | Rhododendron dichroanthumDiels subsp. apodectum (Balf. f. & W. W. Sm.) Cowan | |
| Rhododendron fortunei Lindl. subsp. fortunei | | a | i | Rhododendron fortuneiLindl. subsp. fortunei | |
| Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara | | a | i | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara | |
| Rhododendron degronianum Carriere subsp. degronianum | | a | i | Rhododendron degronianumCarriere subsp. degronianum | |
| Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | a | i | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian | |
| Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. kyomaruense (T. Yamaz.) H. Hara | | a | i | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.kyomaruense (T. Yamaz.) H. Hara | |
| Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. hondoense (Nakai) H. Hara | | a | i | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.hondoense (Nakai) H. Hara | |
| Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. yakushimanum (Nakai) Kitam. | | a | i | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.yakushimanum (Nakai) Kitam. | |
| Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. intermedium (Sugim.) H. Hara | | a | i | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.intermedium (Sugim.) H. Hara | |
| Rhododendron metternichii Siebold & Zucc. var. intermedium Sugim. | Rhododendron degronianum Carriere subsp. yakushimanum (Nakai) H. Hara var. intermedium (Sugim.) H. Hara | | i | Rhododendron metternichiiSiebold & Zucc. var.intermedium Sugim. | Rhododendron degronianumCarriere subsp. yakushimanum (Nakai) H. Hara var.intermedium (Sugim.) H. Hara |
| Rhododendron metternichii Siebold & Zucc. var. hondoense Nakai | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. hondoense (Nakai) H. Hara | | i | Rhododendron metternichiiSiebold & Zucc. var.hondoense Nakai | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.hondoense (Nakai) H. Hara |
| Rhododendron hirtipes Tagg | | a | | Rhododendron hirtipesTagg | |
| Rhododendron hookeri Nutt. | | a | | Rhododendron hookeriNutt. | |
| Rhododendron metternichii Siebold & Zucc. var. heptamerum Maxim. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | i | Rhododendron metternichiiSiebold & Zucc. var.heptamerum Maxim. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian |
| Rhododendron azaleoides hort. ex Dum. Cours. | Rhododendron ponticum L. | | | Rhododendron azaleoideshort. ex Dum. Cours. | Rhododendron ponticumL. |
| Rhododendron campanulatum D. Don subsp. campanulatum | | a | i | Rhododendron campanulatumD. Don subsp. campanulatum | |
| Rhododendron campanulatum D. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. | | a | i | Rhododendron campanulatumD. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. | |
| Rhododendron aeruginosum Hook. f. | Rhododendron campanulatum D. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. | | | Rhododendron aeruginosumHook. f. | Rhododendron campanulatumD. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. |
| Rhododendron campanulatum D. Don var. aeruginosum (Hook. f.) Cowan & Davidian | Rhododendron campanulatum D. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. | | i | Rhododendron campanulatumD. Don var.aeruginosum (Hook. f.) Cowan & Davidian | Rhododendron campanulatumD. Don subsp. aeruginosum (Hook. f.) D. F. Chamb. |
| Rhododendron callimorphum Balf. f. & W. W. Sm. var. callimorphum | | a | i | Rhododendron callimorphumBalf. f. & W. W. Sm. var.callimorphum | |
| Rhododendron callimorphum Balf. f. & W. W. Sm. var. myiagrum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron callimorphumBalf. f. & W. W. Sm. var.myiagrum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron wardii W. W. Sm. var. wardii | | a | i | Rhododendron wardiiW. W. Sm. var.wardii | |
| Rhododendron wardii W. W. Sm. var. puralbum (Balf. f. & W. W. Sm.) D. F. Chamb. | | a | i | Rhododendron wardiiW. W. Sm. var.puralbum (Balf. f. & W. W. Sm.) D. F. Chamb. | |
| Rhododendron puralbum Balf. f. & W. W. Sm. | Rhododendron wardii W. W. Sm. var. puralbum (Balf. f. & W. W. Sm.) D. F. Chamb. | | | Rhododendron puralbumBalf. f. & W. W. Sm. | Rhododendron wardiiW. W. Sm. var.puralbum (Balf. f. & W. W. Sm.) D. F. Chamb. |
| Rhododendron selense Franch. subsp. selense | | a | i | Rhododendron selenseFranch. subsp. selense | |
| Rhododendron selense Franch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. | | a | i | Rhododendron selenseFranch. subsp. dasycladum (Balf. f. & W. W. Sm.) D. F. Chamb. | |
| Rhododendron selense Franch. subsp. setiferum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron selenseFranch. subsp. setiferum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron selense Franch. subsp. jucundum (Balf. f. & W. W. Sm.) D. F. Chamb. | | a | i | Rhododendron selenseFranch. subsp. jucundum (Balf. f. & W. W. Sm.) D. F. Chamb. | |
| Rhododendron jucundum Balf. f. & W. W. Sm. | Rhododendron selense Franch. subsp. jucundum (Balf. f. & W. W. Sm.) D. F. Chamb. | | | Rhododendron jucundumBalf. f. & W. W. Sm. | Rhododendron selenseFranch. subsp. jucundum (Balf. f. & W. W. Sm.) D. F. Chamb. |
| Rhododendron annae Franch. | | a | | Rhododendron annaeFranch. | |
| Rhododendron anthosphaerum Diels | | a | | Rhododendron anthosphaerumDiels | |
| Rhododendron japanoheptamerum Kitam. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. heptamerum (Maxim.) Sealy ex Davidian | | | Rhododendron japanoheptamerumKitam. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.heptamerum (Maxim.) Sealy ex Davidian |
| Rhododendron japanoheptamerum Kitam. var. kyomaruense (T. Yamaz.) T. Yamaz. | Rhododendron degronianum Carriere subsp. heptamerum (Maxim.) H. Hara var. kyomaruense (T. Yamaz.) H. Hara | | i | Rhododendron japanoheptamerumKitam. var.kyomaruense (T. Yamaz.) T. Yamaz. | Rhododendron degronianumCarriere subsp. heptamerum (Maxim.) H. Hara var.kyomaruense (T. Yamaz.) H. Hara |
| Rhododendron arboreum Sm. subsp. nilagiricum (Zenker) Tagg | | a | i | Rhododendron arboreumSm. subsp. nilagiricum (Zenker) Tagg | |
| Rhododendron arboreum Sm. subsp. arboreum | | a | i | Rhododendron arboreumSm. subsp. arboreum | |
| Rhododendron arboreum Sm. subsp. delavayi (Franch.) D. F. Chamb. | | a | i | Rhododendron arboreumSm. subsp. delavayi (Franch.) D. F. Chamb. | |
| Rhododendron arboreum Sm. subsp. zeylanicum (T. J. Booth) Tagg | | a | i | Rhododendron arboreumSm. subsp. zeylanicum (T. J. Booth) Tagg | |
| Rhododendron simulans (Tagg & Forrest) D. F. Chamb. | Rhododendron mimetes Tagg & Forrest var. simulans Tagg & Forrest | | | Rhododendron simulans(Tagg & Forrest) D. F. Chamb. | Rhododendron mimetesTagg & Forrest var.simulans Tagg & Forrest |
| Rhododendron roxieanum Forrest var. roxieanum | | a | i | Rhododendron roxieanumForrest var.roxieanum | |
| Rhododendron roxieanum Forrest var. cucullatum (Hand.-Mazz.) D. F. Chamb. | | a | i | Rhododendron roxieanumForrest var.cucullatum (Hand.-Mazz.) D. F. Chamb. | |
| Rhododendron roxieanum Forrest var. oreonastes (Balf. f. & Forrest) T. L. Ming | | a | i | Rhododendron roxieanumForrest var.oreonastes (Balf. f. & Forrest) T. L. Ming | |
| Rhododendron alutaceum Balf. f. & W. W. Sm. | | a | | Rhododendron alutaceumBalf. f. & W. W. Sm. | |
| Rhododendron alutaceum Balf. f. & W. W. Sm. var. alutaceum | | a | i | Rhododendron alutaceumBalf. f. & W. W. Sm. var.alutaceum | |
| Rhododendron alutaceum Balf. f. & W. W. Sm. var. russotinctum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron alutaceumBalf. f. & W. W. Sm. var.russotinctum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron alutaceum Balf. f. & W. W. Sm. var. iodes (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron alutaceumBalf. f. & W. W. Sm. var.iodes (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron iodes Balf. f. & Forrest | Rhododendron alutaceum Balf. f. & W. W. Sm. var. iodes (Balf. f. & Forrest) D. F. Chamb. | | | Rhododendron iodesBalf. f. & Forrest | Rhododendron alutaceumBalf. f. & W. W. Sm. var.iodes (Balf. f. & Forrest) D. F. Chamb. |
| Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. phaeochrysum | | a | i | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.phaeochrysum | |
| Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. agglutinatum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.agglutinatum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron phaeochrysum Balf. f. & W. W. Sm. var. levistratum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron phaeochrysumBalf. f. & W. W. Sm. var.levistratum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron traillianum Forrest & W. W. Sm. var. traillianum | | a | i | Rhododendron traillianumForrest & W. W. Sm. var.traillianum | |
| Rhododendron traillianum Forrest & W. W. Sm. var. dictyotum (Balf. f. ex Tagg) D. F. Chamb. | | a | i | Rhododendron traillianumForrest & W. W. Sm. var.dictyotum (Balf. f. ex Tagg) D. F. Chamb. | |
| Rhododendron aganniphum Balf. f. & Kingdon-Ward var. aganniphum | | a | i | Rhododendron aganniphumBalf. f. & Kingdon-Ward var.aganniphum | |
| Rhododendron aganniphum Balf. f. & Kingdon-Ward var. flavorufum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron aganniphumBalf. f. & Kingdon-Ward var.flavorufum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron uvarifolium Diels | | a | | Rhododendron uvarifoliumDiels | |
| Rhododendron wallichii Hook. f. | | a | | Rhododendron wallichiiHook. f. | |
| Rhododendron pocophorum Balf. f. ex Tagg var. pocophorum | | a | i | Rhododendron pocophorumBalf. f. ex Tagg var.pocophorum | |
| Rhododendron pocophorum Balf. f. ex Tagg var. hemidartum (Balf. f. ex Tagg) D. F. Chamb. | | a | i | Rhododendron pocophorumBalf. f. ex Tagg var.hemidartum (Balf. f. ex Tagg) D. F. Chamb. | |
| Rhododendron haematodes Franch. subsp. haematodes | | a | i | Rhododendron haematodesFranch. subsp. haematodes | |
| Rhododendron haematodes Franch. subsp. chaetomallum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron haematodesFranch. subsp. chaetomallum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron citriniflorum Balf. f. & Forrest var. citriniflorum | | a | i | Rhododendron citriniflorumBalf. f. & Forrest var.citriniflorum | |
| Rhododendron citriniflorum Balf. f. & Forrest var. horaeum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron citriniflorumBalf. f. & Forrest var.horaeum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron dichroanthum Diels subsp. scyphocalyx (Balf. f. & Forrest) Cowan | | a | i | Rhododendron dichroanthumDiels subsp. scyphocalyx (Balf. f. & Forrest) Cowan | |
| Rhododendron dichroanthum Diels subsp. septentrionale Cowan | | a | i | Rhododendron dichroanthumDiels subsp. septentrionale Cowan | |
| Rhododendron dichroanthum Diels subsp. dichroanthum | | a | i | Rhododendron dichroanthumDiels subsp. dichroanthum | |
| Rhododendron apodectum Balf. f. & W. W. Sm. | Rhododendron dichroanthum Diels subsp. apodectum (Balf. f. & W. W. Sm.) Cowan | | | Rhododendron apodectumBalf. f. & W. W. Sm. | Rhododendron dichroanthumDiels subsp. apodectum (Balf. f. & W. W. Sm.) Cowan |
| Rhododendron sanguineum Franch. var. sanguineum | | a | i | Rhododendron sanguineumFranch. var.sanguineum | |
| Rhododendron sanguineum Franch. var. haemaleum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron sanguineumFranch. var.haemaleum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron sanguineum Franch. var. himertum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron sanguineumFranch. var.himertum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron sanguineum Franch. var. cloiophorum (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron sanguineumFranch. var.cloiophorum (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron sanguineum Franch. var. didymoides Tagg | | a | i | Rhododendron sanguineumFranch. var.didymoides Tagg | |
| Rhododendron sanguineum Franch. var. didymum (Balf. f. & Forrest) T. L. Ming | | a | i | Rhododendron sanguineumFranch. var.didymum (Balf. f. & Forrest) T. L. Ming | |
| Rhododendron eudoxum Balf. f. & Forrest var. eudoxum | | a | i | Rhododendron eudoxumBalf. f. & Forrest var.eudoxum | |
| Rhododendron eudoxum Balf. f. & Forrest var. brunneifolium (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron eudoxumBalf. f. & Forrest var.brunneifolium (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron eudoxum Balf. f. & Forrest var. mesopolium (Balf. f. & Forrest) D. F. Chamb. | | a | i | Rhododendron eudoxumBalf. f. & Forrest var.mesopolium (Balf. f. & Forrest) D. F. Chamb. | |
| Rhododendron erastum Balf. f. & Forrest | | a | | Rhododendron erastumBalf. f. & Forrest | |
| Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaethomsonii | | a | i | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaethomsonii | |
| Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaedoron (Tagg) D. F. Chamb. | | a | i | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaedoron (Tagg) D. F. Chamb. | |
| Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaethauma (Tagg) Cowan & Davidian | | a | i | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaethauma (Tagg) Cowan & Davidian | |
| Rhododendron repens Balf. f. & Forrest var. chamaethauma Tagg | Rhododendron chamaethomsonii (Tagg) Cowan & Davidian var. chamaethauma (Tagg) Cowan & Davidian | | i | Rhododendron repensBalf. f. & Forrest var.chamaethauma Tagg | Rhododendron chamaethomsonii(Tagg) Cowan & Davidian var.chamaethauma (Tagg) Cowan & Davidian |
| Rhododendron forrestii Balf. f. ex Diels subsp. papillatum D. F. Chamb. | | a | i | Rhododendron forrestiiBalf. f. ex Diels subsp. papillatum D. F. Chamb. | |
| Rhododendron forrestii Balf. f. ex Diels subsp. forrestii | | a | i | Rhododendron forrestiiBalf. f. ex Diels subsp. forrestii | |
| Rhododendron neriiflorum Franch. subsp. neriiflorum | | a | i | Rhododendron neriiflorumFranch. subsp. neriiflorum | |
| Rhododendron neriiflorum Franch. subsp. agetum (Balf. f. & Forrest) Tagg | | a | i | Rhododendron neriiflorumFranch. subsp. agetum (Balf. f. & Forrest) Tagg | |
| Rhododendron agetum Balf. f. & Forrest | Rhododendron neriiflorum Franch. subsp. agetum (Balf. f. & Forrest) Tagg | | | Rhododendron agetumBalf. f. & Forrest | Rhododendron neriiflorumFranch. subsp. agetum (Balf. f. & Forrest) Tagg |
| Rhododendron neriiflorum Franch. subsp. phaedropum (Balf. f. & Farrer) Tagg | | a | i | Rhododendron neriiflorumFranch. subsp. phaedropum (Balf. f. & Farrer) Tagg | |
| Rhododendron phaedropum Balf. f. & Farrer | Rhododendron neriiflorum Franch. subsp. phaedropum (Balf. f. & Farrer) Tagg | | | Rhododendron phaedropumBalf. f. & Farrer | Rhododendron neriiflorumFranch. subsp. phaedropum (Balf. f. & Farrer) Tagg |
| Rhododendron eclecteum Balf. f. & Forrest var. eclecteum | | a | i | Rhododendron eclecteumBalf. f. & Forrest var.eclecteum | |
| Rhododendron simsii Planch. var. simsii | | a | i | Rhododendron simsiiPlanch. var.simsii | |
| Rhododendron simsii Planch. var. mesembrinum Rehder | | a | i | Rhododendron simsiiPlanch. var.mesembrinum Rehder | |
| Rhododendron indicum Sweet var. ignescens Sweet | Rhododendron simsii Planch. var. simsii | | i | Rhododendron indicumSweet var.ignescens Sweet | Rhododendron simsiiPlanch. var.simsii |
| Rhododendron indicum Sweet var. simsii (Planch.) Maxim. | Rhododendron simsii Planch. var. simsii | | i | Rhododendron indicumSweet var.simsii (Planch.) Maxim. | Rhododendron simsiiPlanch. var.simsii |
| Rhododendron tsusiophyllum Sugim. | | a | | Rhododendron tsusiophyllumSugim. | |
| Rhododendron dauricum L. var. sempervirens Sims | Rhododendron ledebourii Pojark. | | i | Rhododendron dauricumL. var.sempervirens Sims | Rhododendron ledebouriiPojark. |
| Rhododendron poukhanense H. Lev. | Rhododendron yedoense Maxim. var. poukhanense (H. Lev.) Nakai | | | Rhododendron poukhanenseH. Lev. | Rhododendron yedoenseMaxim. var.poukhanense (H. Lev.) Nakai |
| Rhododendron yedoense Maxim. var. yedoense | | a | i | Rhododendron yedoenseMaxim. var.yedoense | |
| Rhododendron mucronatum (Blume) G. Don var. mucronatum | | a | i | Rhododendron mucronatum(Blume) G. Don var.mucronatum | |
| Rhododendron indicum (L.) Sweet f. japonicum Maxim. | Rhododendron kiusianum Makino | | i | Rhododendron indicum(L.) Sweet f. japonicum Maxim. | Rhododendron kiusianumMakino |
| Rhododendron ledebourii Pojark. | | a | | Rhododendron ledebouriiPojark. | |
| Rhododendron stenopetalum (Hogg) Mabb. | | a | | Rhododendron stenopetalum(Hogg) Mabb. | |
| Rhododendron ×tectum Koidz. | | a | | Rhododendron tectumKoidz. | |
| Rhododendron rubropilosum Hayata | | a | | Rhododendron rubropilosumHayata | |
| Rhododendron rufohirtum Hand.-Mazz. | | a | | Rhododendron rufohirtumHand.-Mazz. | |
| Rhododendron ripense Makino | Rhododendron mucronatum (Blume) G. Don var. ripense (Makino) E. H. Wilson | | | Rhododendron ripenseMakino | Rhododendron mucronatum(Blume) G. Don var.ripense (Makino) E. H. Wilson |
| Rhododendron scabrum G. Don | | a | | Rhododendron scabrumG. Don | |
| Rhododendron sataense Nakai | Rhododendron obtusum (Lindl.) Planch. | | | Rhododendron sataenseNakai | Rhododendron obtusum(Lindl.) Planch. |
| Rhododendron semibarbatum Maxim. | | a | | Rhododendron semibarbatumMaxim. | |
| Rhododendron serpyllifolium (A. Gray) Miq. | | a | | Rhododendron serpyllifolium(A. Gray) Miq. | |
| Rhododendron tanakae (Maxim.) Ohwi | Rhododendron tsusiophyllum Sugim. | | | Rhododendron tanakae(Maxim.) Ohwi | Rhododendron tsusiophyllumSugim. |
| Rhododendron sublanceolatum Miq. | Rhododendron scabrum G. Don | | | Rhododendron sublanceolatumMiq. | Rhododendron scabrumG. Don |
| Rhododendron subsessile Rendle | | a | | Rhododendron subsessileRendle | |
| Rhododendron tashiroi Maxim. | | a | | Rhododendron tashiroiMaxim. | |
| Rhododendron simsii Planch. | | a | | Rhododendron simsiiPlanch. | |
| Rhododendron phoeniceum (Sweet) G. Don | Rhododendron ×pulchrum Sweet | | | Rhododendron phoeniceum(Sweet) G. Don | Rhododendron pulchrumSweet |
| Rhododendron phoeniceum (Sweet) G. Don var. calycinum (Lindl.) E. H. Wilson | Rhododendron ×pulchrum Sweet | | i | Rhododendron phoeniceum(Sweet) G. Don var.calycinum (Lindl.) E. H. Wilson | Rhododendron pulchrumSweet |
| Rhododendron ovatum (Lindl.) Maxim. | | a | | Rhododendron ovatum(Lindl.) Maxim. | |
| Rhododendron omurasaki Makino | Rhododendron ×pulchrum Sweet | | | Rhododendron omurasakiMakino | Rhododendron pulchrumSweet |
| Rhododendron nipponicum Matsum. | | a | | Rhododendron nipponicumMatsum. | |
| Rhododendron nakaharae Hayata | | a | | Rhododendron nakaharaeHayata | |
| Rhododendron oldhamii Maxim. | | a | | Rhododendron oldhamiiMaxim. | |
| Rhododendron obtusum (Lindl.) Planch. | | a | | Rhododendron obtusum(Lindl.) Planch. | |
| Rhododendron obtusum (Lindl.) Planch. f. amoenum (Lindl.) E. H. Wilson | Rhododendron obtusum (Lindl.) Planch. | | i | Rhododendron obtusum(Lindl.) Planch. f. amoenum (Lindl.) E. H. Wilson | Rhododendron obtusum(Lindl.) Planch. |
| Rhododendron obtusum (Lindl.) Planch. var. japonicum (Maxim.) Kitam. | Rhododendron kiusianum Makino | | i | Rhododendron obtusum(Lindl.) Planch. var.japonicum (Maxim.) Kitam. | Rhododendron kiusianumMakino |
| Rhododendron obtusum (Lindl.) Planch. var. kaempferi (Planch.) E. H. Wilson | Rhododendron kaempferi Planch. | | i | Rhododendron obtusum(Lindl.) Planch. var.kaempferi (Planch.) E. H. Wilson | Rhododendron kaempferiPlanch. |
| Rhododendron ×pulchrum Sweet | | a | | Rhododendron pulchrumSweet | |
| Rhododendron ×pulchrum Sweet var. calycinum (Lindl.) Rehder | Rhododendron ×pulchrum Sweet | | i | Rhododendron pulchrumSweet var.calycinum (Lindl.) Rehder | Rhododendron pulchrumSweet |
| Rhododendron ×pulchrum Sweet var. maxwellii Rehder | Rhododendron ×pulchrum Sweet | | i | Rhododendron pulchrumSweet var.maxwellii Rehder | Rhododendron pulchrumSweet |
| Rhododendron ×pulchrum Sweet var. phoeniceum (Sweet) Rehder | Rhododendron ×pulchrum Sweet | | i | Rhododendron pulchrumSweet var.phoeniceum (Sweet) Rehder | Rhododendron pulchrumSweet |
| Rhododendron tschonoskii Maxim. | | a | | Rhododendron tschonoskiiMaxim. | |
| Rhododendron tosaense Makino | | a | | Rhododendron tosaenseMakino | |
| Rhododendron yedoense Maxim. | | a | | Rhododendron yedoenseMaxim. | |
| Rhododendron yedoense Maxim. var. poukhanense (H. Lev.) Nakai | | a | i | Rhododendron yedoenseMaxim. var.poukhanense (H. Lev.) Nakai | |
| Rhododendron kaempferi Planch. | | a | | Rhododendron kaempferiPlanch. | |
| Rhododendron kaempferi Planch. f. album Nakai | Rhododendron kaempferi Planch. | | i | Rhododendron kaempferiPlanch. f. album Nakai | Rhododendron kaempferiPlanch. |
| Rhododendron indicum (L.) Sweet | | a | | Rhododendron indicum(L.) Sweet | |
| Rhododendron indicum (L.) Sweet var. eriocarpum Hayata | Rhododendron eriocarpum (Hayata) Nakai | | i | Rhododendron indicum(L.) Sweet var.eriocarpum Hayata | Rhododendron eriocarpum(Hayata) Nakai |
| Rhododendron indicum (L.) Sweet var. phoeniceum Sweet | Rhododendron ×pulchrum Sweet | | i | Rhododendron indicum(L.) Sweet var.phoeniceum Sweet | Rhododendron pulchrumSweet |
| Rhododendron lasiostylum Hayata | | a | | Rhododendron lasiostylumHayata | |
| Rhododendron komiyamae Makino | | a | | Rhododendron komiyamaeMakino | |
| Rhododendron kanehirae E. H. Wilson | | a | | Rhododendron kanehiraeE. H. Wilson | |
| Rhododendron kiusianum Makino | | a | | Rhododendron kiusianumMakino | |
| Rhododendron leptothrium Balf. f. & Forrest | | a | | Rhododendron leptothriumBalf. f. & Forrest | |
| Rhododendron linearifolium Siebold & Zucc. | Rhododendron stenopetalum (Hogg) Mabb. | | | Rhododendron linearifoliumSiebold & Zucc. | Rhododendron stenopetalum(Hogg) Mabb. |
| Rhododendron linearifolium Siebold & Zucc. var. macrosepalum (Maxim.) Makino | Rhododendron stenopetalum (Hogg) Mabb. | | i | Rhododendron linearifoliumSiebold & Zucc. var.macrosepalum (Maxim.) Makino | Rhododendron stenopetalum(Hogg) Mabb. |
| Rhododendron eriocarpum (Hayata) Nakai | | a | | Rhododendron eriocarpum(Hayata) Nakai | |
| Rhododendron mucronatum (Blume) G. Don | | a | | Rhododendron mucronatum(Blume) G. Don | |
| Rhododendron mucronatum (Blume) G. Don var. ripense (Makino) E. H. Wilson | | a | i | Rhododendron mucronatum(Blume) G. Don var.ripense (Makino) E. H. Wilson | |
| Rhododendron microphyton Franch. | | a | | Rhododendron microphytonFranch. | |
| Rhododendron maxwellii Millais | Rhododendron ×pulchrum Sweet | | | Rhododendron maxwelliiMillais | Rhododendron pulchrumSweet |
| Rhododendron macrosepalum Maxim. | Rhododendron stenopetalum (Hogg) Mabb. | | | Rhododendron macrosepalumMaxim. | Rhododendron stenopetalum(Hogg) Mabb. |
| Rhododendron austrokiusianum Hatus. | Rhododendron obtusum (Lindl.) Planch. | | | Rhododendron austrokiusianumHatus. | Rhododendron obtusum(Lindl.) Planch. |
| Rhododendron balsaminiflorum Carriere | Rhododendron indicum (L.) Sweet | | | Rhododendron balsaminiflorumCarriere | Rhododendron indicum(L.) Sweet |
| Rhododendron decandrum (Makino) Makino | | a | | Rhododendron decandrum(Makino) Makino | |
| Rhododendron amagianum (Makino) H. Hara | | a | | Rhododendron amagianum(Makino) H. Hara | |
| Rhododendron dilatatum Miq. | | a | | Rhododendron dilatatumMiq. | |
| Rhododendron farrerae Tate ex Sweet | | a | | Rhododendron farreraeTate ex Sweet | |
| Rhododendron mariesii Hemsl. & E. H. Wilson | | a | | Rhododendron mariesiiHemsl. & E. H. Wilson | |
| Rhododendron mayebarae Nakai & H. Hara | | a | | Rhododendron mayebaraeNakai & H. Hara | |
| Rhododendron kiyosumense (Makino) Makino | | a | | Rhododendron kiyosumense(Makino) Makino | |
| Rhododendron weyrichii Maxim. | | a | | Rhododendron weyrichiiMaxim. | |
| Rhododendron reticulatum D. Don ex G. Don | | a | | Rhododendron reticulatumD. Don ex G. Don | |
| Rhododendron nudipes Nakai | | a | | Rhododendron nudipesNakai | |
| Rhododendron shikokianum Makino, nom. inval. | Rhododendron weyrichii Maxim. | | | Rhododendron shikokianumMakino, nom. inval. | Rhododendron weyrichiiMaxim. |
| Rhododendron rhombicum Miq. | Rhododendron reticulatum D. Don ex G. Don | | | Rhododendron rhombicumMiq. | Rhododendron reticulatumD. Don ex G. Don |
| Rhododendron sanctum Nakai | | a | | Rhododendron sanctumNakai | |
| Rhododendron wadanum Makino | | a | | Rhododendron wadanumMakino | |
| Rhododendron dilatatum Miq. var. decandrum Makino | Rhododendron decandrum (Makino) Makino | | i | Rhododendron dilatatumMiq. var.decandrum Makino | Rhododendron decandrum(Makino) Makino |
| Rhododendron molle (Blume) G. Don subsp. molle | | a | i | Rhododendron molle(Blume) G. Don subsp. molle | |
| Rhododendron cumberlandense E. L. Braun | | a | | Rhododendron cumberlandenseE. L. Braun | |
| Rhododendron flammeum (Michx.) Sarg. | | a | | Rhododendron flammeum(Michx.) Sarg. | |
| Rhododendron viscosum (L.) Torr. | | a | | Rhododendron viscosum(L.) Torr. | |
| Rhododendron colemanii R. F. Mill. | | a | | Rhododendron colemaniiR. F. Mill. | |
| Rhododendron roseum Rehder | Rhododendron canescens (Michx.) Sweet | | | Rhododendron roseumRehder | Rhododendron canescens(Michx.) Sweet |
| Rhododendron oblongifolium (Small) Millais | Rhododendron viscosum (L.) Torr. | | | Rhododendron oblongifolium(Small) Millais | Rhododendron viscosum(L.) Torr. |
| Rhododendron occidentale (Torr. & A. Gray) A. Gray | | a | | Rhododendron occidentale(Torr. & A. Gray) A. Gray | |
| Rhododendron nudiflorum Torr. | Rhododendron periclymenoides (Michx.) Shinners | | | Rhododendron nudiflorumTorr. | Rhododendron periclymenoides(Michx.) Shinners |
| Rhododendron nudiflorum Torr. f. glandiferum (Porter) Fernald | Rhododendron periclymenoides (Michx.) Shinners | | i | Rhododendron nudiflorumTorr. f. glandiferum (Porter) Fernald | Rhododendron periclymenoides(Michx.) Shinners |
| Rhododendron prunifolium (Small) Millais | | a | | Rhododendron prunifolium(Small) Millais | |
| Rhododendron viscosum (L.) Torr. var. glaucum Torr. | Rhododendron viscosum (L.) Torr. | | i | Rhododendron viscosum(L.) Torr. var.glaucum Torr. | Rhododendron viscosum(L.) Torr. |
| Rhododendron viscosum (L.) Torr. var. nitidum (Pursh) A. Gray | Rhododendron viscosum (L.) Torr. | | i | Rhododendron viscosum(L.) Torr. var.nitidum (Pursh) A. Gray | Rhododendron viscosum(L.) Torr. |
| Rhododendron viscosum (L.) Torr. f. rhodanthum Rehder | Rhododendron viscosum (L.) Torr. | | i | Rhododendron viscosum(L.) Torr. f. rhodanthum Rehder | Rhododendron viscosum(L.) Torr. |
| Rhododendron calendulaceum (Michx.) Torr. | | a | | Rhododendron calendulaceum(Michx.) Torr. | |
| Rhododendron periclymenoides (Michx.) Shinners | | a | | Rhododendron periclymenoides(Michx.) Shinners | |
| Rhododendron roseum auct. | Rhododendron prinophyllum (Small) Millais | | | Rhododendron roseumauct. | Rhododendron prinophyllum(Small) Millais |
| Rhododendron prinophyllum (Small) Millais | | a | | Rhododendron prinophyllum(Small) Millais | |
| Rhododendron arborescens (Pursh) Torr. | | a | | Rhododendron arborescens(Pursh) Torr. | |
| Rhododendron austrinum (Small) Rehder | | a | | Rhododendron austrinum(Small) Rehder | |
| Rhododendron molle (Blume) G. Don subsp. japonicum (A. Gray) Kron | | a | i | Rhododendron molle(Blume) G. Don subsp. japonicum (A. Gray) Kron | |
| Rhododendron ×kosterianum C. K. Schneid. | | a | | Rhododendron kosterianumC. K. Schneid. | |
| Rhododendron japonicum (A. Gray) Valck. Sur. | Rhododendron molle (Blume) G. Don subsp. japonicum (A. Gray) Kron | | | Rhododendron japonicum(A. Gray) Valck. Sur. | Rhododendron molle(Blume) G. Don subsp. japonicum (A. Gray) Kron |
| Rhododendron japonicum (A. Gray) Valck. Sur. var. glaucophyllum H. Hara ex Ohwi, nom. inval. | Rhododendron molle (Blume) G. Don subsp. japonicum (A. Gray) Kron | | i | Rhododendron japonicum(A. Gray) Valck. Sur. var.glaucophyllum H. Hara ex Ohwi, nom. inval. | Rhododendron molle(Blume) G. Don subsp. japonicum (A. Gray) Kron |
| Rhododendron molle (Blume) G. Don | | a | | Rhododendron molle(Blume) G. Don | |
| Rhododendron luteum Sweet | | a | | Rhododendron luteumSweet | |
| Rhododendron flavum G. Don | Rhododendron luteum Sweet | | | Rhododendron flavumG. Don | Rhododendron luteumSweet |
| Rhododendron atlanticum (Ashe) Rehder | | a | | Rhododendron atlanticum(Ashe) Rehder | |
| Rhododendron alabamense Rehder | | a | | Rhododendron alabamenseRehder | |
| Rhododendron canadense (L.) Torr. | | a | | Rhododendron canadense(L.) Torr. | |
| Rhododendron canescens (Michx.) Sweet | | a | | Rhododendron canescens(Michx.) Sweet | |
| Rhododendron canescens (Michx.) Sweet var. candidum (Small) Rehder | Rhododendron canescens (Michx.) Sweet | | i | Rhododendron canescens(Michx.) Sweet var.candidum (Small) Rehder | Rhododendron canescens(Michx.) Sweet |
| Rhododendron albrechtii Maxim. | | a | | Rhododendron albrechtiiMaxim. | |
| Rhododendron albiflorum Hook. | | a | | Rhododendron albiflorumHook. | |
| Rhododendron vaseyi A. Gray | | a | | Rhododendron vaseyiA. Gray | |
| Rhododendron quinquefolium Bisset & S. Moore | | a | | Rhododendron quinquefoliumBisset & S. Moore | |
| Rhododendron pentaphyllum Maxim. | | a | | Rhododendron pentaphyllumMaxim. | |
| Rhododendron pentaphyllum Maxim. var. nikoense Komatsu | | a | i | Rhododendron pentaphyllumMaxim. var.nikoense Komatsu | |
| Rhododendron schlippenbachii Maxim. | | a | | Rhododendron schlippenbachiiMaxim. | |
| Rhododendron benhallii Craven | | a | | Rhododendron benhalliiCraven | |
| Rhododendron menziesii Craven | | a | | Rhododendron menziesiiCraven | |
| Rhododendron menziesii Craven subsp. glabellum (A. Gray) Craven | | a | i | Rhododendron menziesiiCraven subsp. glabellum (A. Gray) Craven | |
| Rhododendron menziesii Craven subsp. menziesii | | a | i | Rhododendron menziesiiCraven subsp. menziesii | |
| Rhododendron multiflorum (Maxim.) Craven var. purpureum (Makino) Craven | | a | i | Rhododendron multiflorum(Maxim.) Craven var.purpureum (Makino) Craven | |
| Rhododendron multiflorum (Maxim.) Craven f. bicolor (Makino) Craven | | a | i | Rhododendron multiflorum(Maxim.) Craven f. bicolor (Makino) Craven | |
| Rhododendron multiflorum (Maxim.) Craven | | a | | Rhododendron multiflorum(Maxim.) Craven | |
| Rhododendron pentandrum (Maxim.) Craven | | a | | Rhododendron pentandrum(Maxim.) Craven | |
| Rhododendron pilosum (Michx.) Craven | | a | | Rhododendron pilosum(Michx.) Craven | |
| Rhododendron kroniae Craven | | a | | Rhododendron kroniaeCraven | |
| Rhododendron latoucheae Franch. | | a | | Rhododendron latoucheaeFranch. | |
| Rhododendron amamiense Ohwi | Rhododendron latoucheae Franch. | | | Rhododendron amamienseOhwi | Rhododendron latoucheaeFranch. |
| Rhododendron moulmainense Hook. f. | | a | | Rhododendron moulmainenseHook. f. | |
| Rhododendron stenaulum Balf. f. & W. W. Sm. | Rhododendron moulmainense Hook. f. | | | Rhododendron stenaulumBalf. f. & W. W. Sm. | Rhododendron moulmainenseHook. f. |
| Rhododendron ellipticum Maxim. | Rhododendron moulmainense Hook. f. | | | Rhododendron ellipticumMaxim. | Rhododendron moulmainenseHook. f. |