| Rhododendron achroanthum Balf. f. & W. W. Sm. | Rhododendron rupicola W. W. Sm. var. rupicola | | i |
| Rhododendron acraium Balf. f. & W. W. Sm. | Rhododendron primuliflorum Bureau & Franch. | | i |
| Rhododendron acuminatum Hook. f. | | a | i |
| Rhododendron adamsii Rehder | | a | |
| Rhododendron amaurophyllum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. saluenense | | i |
| Rhododendron ambiguum Hemsl. | | a | |
| Rhododendron anagalliflorum Wernham | | a | |
| Rhododendron anthopogon D. Don | | a | |
| Rhododendron anthopogon D. Don subsp. anthopogon | | a | i |
| Rhododendron anthopogon D. Don subsp. hypenanthum (Balf. f.) Cullen | | a | i |
| Rhododendron artosquameum Balf. f. & Forrest | Rhododendron oreotrephes W. W. Sm. | | i |
| Rhododendron atropurpureum Sleumer | | a | |
| Rhododendron augustinii Hemsl. | | a | |
| Rhododendron augustinii Hemsl. subsp. augustinii | | a | i |
| Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | a | i |
| Rhododendron augustinii Hemsl. subsp. hardyi (Davidian) Cullen | | a | i |
| Rhododendron augustinii Hemsl. subsp. rubrum (Davidian) Cullen | | a | i |
| Rhododendron aurigeranum Sleumer | | a | |
| Rhododendron auritum Tagg | | a | |
| Rhododendron baileyi Balf. f. | | a | i |
| Rhododendron beyerinckianum Koord. | | a | |
| Rhododendron boothii Nutt. | | a | |
| Rhododendron brachyanthum Franch. | | a | |
| Rhododendron brachyanthum Franch. subsp. brachyanthum | | a | i |
| Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | a | i |
| Rhododendron brachyanthum Franch. var. hypolepidotum Franch. | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | i |
| Rhododendron brevistylum Franch. | Rhododendron heliolepis Franch. var. brevistylum (Franch.) Cullen | | |
| Rhododendron brookeanum H. Low ex Lindl. | | a | |
| Rhododendron bullatum Franch. | Rhododendron edgeworthii Hook. f. | | |
| Rhododendron burmanicum Hutch. | | a | |
| Rhododendron buxifolium H. Low ex Hook. f. var. robustum Sleumer | | a | i |
| Rhododendron caeruleum H. Lev. | Rhododendron rigidum Franch. | | |
| Rhododendron calciphilum Hutch. & Kingdon-Ward | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward | | a | i |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. calostrotum | | a | i |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | a | i |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparioides Cullen | | a | i |
| Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | a | i |
| Rhododendron camelliiflorum Hook. f. | | a | i |
| Rhododendron campylogynum Franch. | | a | |
| Rhododendron cantabile Balf. f. ex Hutch. | Rhododendron russatum Balf. f. & Forrest | | i |
| Rhododendron capitatum Maxim. | | a | |
| Rhododendron carneum Hutch. | | a | |
| Rhododendron carolinianum Rehder | Rhododendron minus Michx. var. minus | | |
| Rhododendron carringtoniae F. Muell. | | a | |
| Rhododendron cephalanthum Franch. | | a | |
| Rhododendron cephalanthum Franch. subsp. cephalanthum | | a | i |
| Rhododendron cephalanthum Franch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen | | a | i |
| Rhododendron chamaetortum Balf. f. & Kingdon-Ward | Rhododendron cephalanthum Franch. subsp. cephalanthum | | i |
| Rhododendron chameunum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | i |
| Rhododendron chapmanii (Alph. Wood) A. Gray | Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | |
| Rhododendron charitopes Balf. f. & Farrer | | a | i |
| Rhododendron charitostreptum Balf. f. & Kingdon-Ward | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | i |
| Rhododendron chartophyllum Franch. | Rhododendron yunnanense Franch. | | |
| Rhododendron chasmanthoides Balf. f. & Forrest | Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | i |
| Rhododendron chasmanthum Diels | Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen | | |
| Rhododendron christianae Sleumer | | a | |
| Rhododendron christii F. Forst. | | a | |
| Rhododendron chryseum Balf. f. & Kingdon-Ward | Rhododendron rupicola W. W. Sm. var. chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson | | i |
| Rhododendron chrysodoron Tagg ex Hutch. | | a | |
| Rhododendron chrysolepis Hutch. & Kingdon-Ward | | a | |
| Rhododendron ciliatum Hook. f. | | a | i |
| Rhododendron ciliicalyx Franch. | | a | |
| Rhododendron cinnabarinum Hook. f. | | a | i |
| Rhododendron cinnabarinum Hook. f. subsp. cinnabarinum | | a | i |
| Rhododendron cinnabarinum Hook. f. subsp. tamaense (Davidian) Cullen | | a | i |
| Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | a | i |
| Rhododendron citrinum (Hassk.) Hassk. | | a | |
| Rhododendron clivicola Balf. f. & W. W. Sm. | Rhododendron primuliflorum Bureau & Franch. | | i |
| Rhododendron columbianum (Piper) Harmaja | | a | |
| Rhododendron commonae F. Forst. | | a | |
| Rhododendron concatenans Hutch. | Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | |
| Rhododendron concinnum Hemsl. | | a | |
| Rhododendron coriifolium Sleumer | | a | |
| Rhododendron cosmetum Balf. f. & Forrest | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | i |
| Rhododendron crassum Franch. | Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | |
| Rhododendron crebreflorum Hutch. & Kingdon-Ward | Rhododendron cephalanthum Franch. subsp. cephalanthum | | |
| Rhododendron cruttwellii Sleumer | | a | |
| Rhododendron cubittii Hutch. | Rhododendron veitchianum Hook. | | |
| Rhododendron cuffeanum Craib ex Hutch. | | a | |
| Rhododendron culminicola F. Muell. | | a | |
| Rhododendron cuneatum W. W. Sm. | | a | |
| Rhododendron dalhousieae Hook. f. | | a | i |
| Rhododendron dalhousieae Hook. f. var. dalhousieae | | a | i |
| Rhododendron dalhousieae Hook. f. var. rhabdotum (Balf. f. & R. E. Cooper) Cullen | | a | i |
| Rhododendron dasypetalum Balf. f. & Forrest | | a | i |
| Rhododendron dauricum L. | | a | |
| Rhododendron dauricum L. var. mucronulatum (Turcz.) Maxim. | Rhododendron mucronulatum Turcz. var. mucronulatum | | i |
| Rhododendron davidsonianum Rehder & E. H. Wilson | | a | |
| Rhododendron deleiense Hutch. & Kingdon-Ward | Rhododendron tephropeplum Balf. f. & Forrest | | |
| Rhododendron dendricola Hutch. | | a | |
| Rhododendron desquamatum Balf. f. & Forrest | Rhododendron rubiginosum Franch. | | i |
| Rhododendron dielsianum Schltr. | | a | |
| Rhododendron diversipilosum (Nakai) Harmaja | | a | |
| Rhododendron drumonium Balf. f. & Kingdon-Ward | Rhododendron telmateium Balf. f. & W. W. Sm. | | i |
| Rhododendron edgarianum Rehder & E. H. Wilson | | a | |
| Rhododendron edgeworthii Hook. f. | | a | i |
| Rhododendron ericoides H. Low ex Hook. f. | | a | i |
| Rhododendron exquisitum Hutch. | Rhododendron oreotrephes W. W. Sm. | | |
| Rhododendron fallacinum Sleumer | | a | |
| Rhododendron fastigiatum Franch. | | a | |
| Rhododendron ferrugineum L. | | a | |
| Rhododendron formosum Wall. | | a | |
| Rhododendron formosum Wall. var. formosum | | a | i |
| Rhododendron formosum Wall. var. inaequale C. B. Clarke | | a | i |
| Rhododendron formosum Wall. var. johnstoneanum Brandis | Rhododendron johnstoneanum (Brandis) G. Watt ex Hutch. | | i |
| Rhododendron fragrantissimum Burb. ex Rehder | | a | |
| Rhododendron gaultheriifolium J. J. Sm. | | a | |
| Rhododendron genestierianum Forrest | | a | |
| Rhododendron glaucophyllum Rehder | | a | |
| Rhododendron glomerulatum Hutch. | Rhododendron yungningense Balf. f. ex Hutch. | | |
| Rhododendron gracilentum F. Muell. | | a | |
| Rhododendron groenlandicum (Oeder) Kron & Judd | | a | |
| Rhododendron hansemannii Warb. | Rhododendron macgregoriae F. Muell. | | |
| Rhododendron hardyi Davidian | Rhododendron augustinii Hemsl. subsp. hardyi (Davidian) Cullen | | |
| Rhododendron heliolepis Franch. | | a | |
| Rhododendron heliolepis Franch. var. brevistylum (Franch.) Cullen | | a | i |
| Rhododendron heliolepis Franch. var. heliolepis | | a | i |
| Rhododendron hemitrichotum Balf. f. & Forrest | | a | i |
| Rhododendron herzogii Warb. | | a | |
| Rhododendron hippophaeoides Balf. f. & W. W. Sm. | | a | i |
| Rhododendron hirsutum L. | | a | |
| Rhododendron hypenanthum Balf. f. | Rhododendron anthopogon D. Don subsp. hypenanthum (Balf. f.) Cullen | | i |
| Rhododendron hypolepidotum (Franch.) Balf. f. & Forrest | Rhododendron brachyanthum Franch. subsp. hypolepidotum (Franch.) Cullen | | i |
| Rhododendron hypoleucum (Kom.) Harmaja | | a | |
| Rhododendron impeditum Balf. f. & W. W. Sm. | | a | i |
| Rhododendron imperator Kingdon-Ward | Rhododendron uniflorum Kingdon-Ward var. imperator (Kingdon-Ward) Cullen | | |
| Rhododendron inaequale (C. B. Clarke) Hutch. | Rhododendron formosum Wall. var. inaequale C. B. Clarke | | |
| Rhododendron inconspicuum J. J. Sm. | | a | |
| Rhododendron insculptum Hutch. & Kingdon-Ward | | a | |
| Rhododendron intricatum Franch. | | a | |
| Rhododendron invasorium Sleumer | Rhododendron inconspicuum J. J. Sm. | | |
| Rhododendron iteaphyllum Hutch. | Rhododendron formosum Wall. var. formosum | | |
| Rhododendron jasminiflorum Hook. | | a | |
| Rhododendron jasminiflorum Hook. var. jasminiflorum | | a | i |
| Rhododendron jasminiflorum Hook. var. punctatum Ridl. | | a | i |
| Rhododendron javanicum (Blume) Benn. | | a | |
| Rhododendron javanicum (Blume) Benn. var. schadenbergii (Warb.) Sleumer | | a | i |
| Rhododendron johnstoneanum (Brandis) G. Watt ex Hutch. | | a | |
| Rhododendron kasoense Hutch. & Kingdon-Ward | | a | |
| Rhododendron kawakamii Hayata | | a | |
| Rhododendron keiskei Miq. | | a | |
| Rhododendron keleticum Balf. f. & Forrest | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | i |
| Rhododendron keysii Nutt. | | a | |
| Rhododendron konori Becc. | | a | |
| Rhododendron laetum J. J. Sm. | | a | |
| Rhododendron lapponicum (L.) Wahlenb. | | a | |
| Rhododendron lepidostylum Balf. f. & Forrest | | a | i |
| Rhododendron lepidotum Wall. ex G. Don | | a | |
| Rhododendron leptanthum F. Muell. | | a | |
| Rhododendron leptocarpum Nutt. | | a | |
| Rhododendron leucaspis Tagg | | a | |
| Rhododendron lindaueanum Koord. | | a | |
| Rhododendron lindleyi T. Moore | | a | |
| Rhododendron litangense Balf. f. ex Hutch. | Rhododendron impeditum Balf. f. & W. W. Sm. | | i |
| Rhododendron lochiae F. Muell. | | a | |
| Rhododendron longiflorum Lindl. | | a | |
| Rhododendron longistylum Rehder & E. H. Wilson | | a | |
| Rhododendron lowii Hook. f. | | a | i |
| Rhododendron lowndesii Davidian | | a | |
| Rhododendron ludlowii Cowan | | a | |
| Rhododendron luteosquamatum Sleumer | | a | |
| Rhododendron lutescens Franch. | | a | |
| Rhododendron lysolepis Hutch. | | a | |
| Rhododendron macgregoriae F. Muell. | | a | |
| Rhododendron maddenii Hook. f. | | a | i |
| Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | a | i |
| Rhododendron maddenii Hook. f. subsp. maddenii | | a | i |
| Rhododendron manipurense Balf. f. & G. Watt | Rhododendron maddenii Hook. f. subsp. crassum (Franch.) Cullen | | i |
| Rhododendron maxwellii Gibbs | | a | |
| Rhododendron megacalyx Balf. f. & Kingdon-Ward | | a | i |
| Rhododendron megeratum Balf. f. & Forrest | | a | i |
| Rhododendron micranthum Turcz. | | a | |
| Rhododendron micromeres Tagg | Rhododendron leptocarpum Nutt. | | |
| Rhododendron minus Michx. | | a | |
| Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | a | i |
| Rhododendron minus Michx. var. minus | | a | i |
| Rhododendron mishmiense Hutch. & Kingdon-Ward | Rhododendron boothii Nutt. | | |
| Rhododendron mollicomum Balf. f. & W. W. Sm. | | a | i |
| Rhododendron moupinense Franch. | | a | |
| Rhododendron mucronulatum Turcz. | | a | |
| Rhododendron mucronulatum Turcz. var. ciliatum Nakai | | a | i |
| Rhododendron mucronulatum Turcz. var. maritimum Nakai | | a | i |
| Rhododendron mucronulatum Turcz. var. mucronulatum | | a | i |
| Rhododendron muliense Balf. f. & Forrest | Rhododendron rupicola W. W. Sm. var. muliense (Balf. f. & Forrest) Philipson & M. N. Philipson | | i |
| Rhododendron multicolor Miq. | | a | |
| Rhododendron multinervium Sleumer | | a | |
| Rhododendron myrtilloides Balf. f. & Kingdon-Ward | Rhododendron campylogynum Franch. | | i |
| Rhododendron neoglandulosum Harmaja | Rhododendron columbianum (Piper) Harmaja | | |
| Rhododendron nivale Hook. f. | | a | i |
| Rhododendron nivale Hook. f. subsp. australe Philipson & M. N. Philipson | | a | i |
| Rhododendron nivale Hook. f. subsp. boreale Philipson & M. N. Philipson | | a | i |
| Rhododendron nivale Hook. f. subsp. nivale | | a | i |
| Rhododendron nummatum J. J. Sm. | | a | |
| Rhododendron nuttallii T. J. Booth ex Nutt. | | a | |
| Rhododendron oleifolium Franch. | Rhododendron virgatum Hook. f. subsp. oleifolium (Franch.) Cullen | | |
| Rhododendron oreotrephes W. W. Sm. | | a | |
| Rhododendron oulotrichum Balf. f. & Forrest | Rhododendron trichocladum Franch. | | i |
| Rhododendron pachypodum Balf. f. & W. W. Sm. | | a | i |
| Rhododendron paludosum Hutch. & Kingdon-Ward | Rhododendron nivale Hook. f. subsp. nivale | | |
| Rhododendron palustre (L.) Kron & Judd | Rhododendron tomentosum Harmaja | | |
| Rhododendron parvifolium Adams | Rhododendron lapponicum (L.) Wahlenb. | | |
| Rhododendron pemakoense Kingdon-Ward | | a | |
| Rhododendron phaeochitum F. Muell. | | a | |
| Rhododendron platyphyllum Balf. f. & W. W. Sm. | Rhododendron cephalanthum Franch. subsp. platyphyllum (Balf. f. & W. W. Sm.) Cullen | | i |
| Rhododendron pleianthum Sleumer | | a | |
| Rhododendron polycladum Franch. | | a | |
| Rhododendron praecox hort. | | a | |
| Rhododendron primuliflorum Bureau & Franch. | | a | |
| Rhododendron prostratum W. W. Sm. | Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | |
| Rhododendron pruniflorum Hutch. & Kingdon-Ward | | a | |
| Rhododendron pseudoyanthinum Balf. f. ex Hutch. | Rhododendron concinnum Hemsl. | | i |
| Rhododendron pubescens Balf. f. & Forrest | | a | i |
| Rhododendron pumilum Hook. f. | | a | i |
| Rhododendron punctatum Andrews | Rhododendron minus Michx. var. minus | | |
| Rhododendron punctatum Andrews var. chapmanii Alph. Wood | Rhododendron minus Michx. var. chapmanii (Alph. Wood) W. H. Duncan & Pullen | | i |
| Rhododendron racemosum Franch. | | a | i |
| Rhododendron radicans Balf. f. & Forrest | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. keleticum (Balf. f. & Forrest) Cullen | | i |
| Rhododendron radinum Balf. f. & W. W. Sm. | Rhododendron trichostomum Franch. | | i |
| Rhododendron rarum Schltr. | | a | |
| Rhododendron ravum Balf. f. & W. W. Sm. | Rhododendron cuneatum W. W. Sm. | | i |
| Rhododendron retusum (Blume) Benn. | | a | |
| Rhododendron rhabdotum Balf. f. & R. E. Cooper | Rhododendron dalhousieae Hook. f. var. rhabdotum (Balf. f. & R. E. Cooper) Cullen | | i |
| Rhododendron rigidum Franch. | | a | |
| Rhododendron riparium Kingdon-Ward ex Hutch. | Rhododendron calostrotum Balf. f. & Kingdon-Ward subsp. riparium (Kingdon-Ward ex Hutch.) Cullen | | |
| Rhododendron roylei Hook. f. | Rhododendron cinnabarinum Hook. f. subsp. cinnabarinum | | i |
| Rhododendron rubiginosum Franch. | | a | |
| Rhododendron rubrum Davidian | Rhododendron augustinii Hemsl. subsp. rubrum (Davidian) Cullen | | |
| Rhododendron rufescens Franch. | | a | |
| Rhododendron rugosum H. Low ex Hook. f. | | a | i |
| Rhododendron rugosum H. Low ex Hook. f. var. coriifolium (Sleumer) Sleumer | Rhododendron coriifolium Sleumer | | i |
| Rhododendron rupicola W. W. Sm. | | a | |
| Rhododendron rupicola W. W. Sm. var. chryseum (Balf. f. & Kingdon-Ward) Philipson & M. N. Philipson | | a | i |
| Rhododendron rupicola W. W. Sm. var. muliense (Balf. f. & Forrest) Philipson & M. N. Philipson | | a | i |
| Rhododendron rupicola W. W. Sm. var. rupicola | | a | i |
| Rhododendron russatum Balf. f. & Forrest | | a | i |
| Rhododendron saluenense Franch. | | a | |
| Rhododendron saluenense Franch. subsp. chameunum (Balf. f. & Forrest) Cullen | | a | i |
| Rhododendron saluenense Franch. subsp. saluenense | | a | i |
| Rhododendron sargentianum Rehder & E. H. Wilson | | a | |
| Rhododendron scabridibracteum Sleumer | | a | |
| Rhododendron schadenbergii Warb. | Rhododendron javanicum (Blume) Benn. var. schadenbergii (Warb.) Sleumer | | |
| Rhododendron scintillans Balf. f. & W. W. Sm. | Rhododendron polycladum Franch. | | i |
| Rhododendron searsiae Rehder & E. H. Wilson | | a | |
| Rhododendron seinghkuense Kingdon-Ward ex Hutch. | | a | |
| Rhododendron setosum D. Don | | a | |
| Rhododendron sichotense Pojark. | | a | |
| Rhododendron siderophyllum Franch. | | a | |
| Rhododendron sinonuttallii Balf. f. & Forrest | Rhododendron nuttallii T. J. Booth ex Nutt. | | i |
| Rhododendron spinuliferum Franch. | | a | |
| Rhododendron subarcticum Harmaja | | a | |
| Rhododendron suberosum Balf. f. & Forrest | Rhododendron yunnanense Franch. | | i |
| Rhododendron subulatum (Nakai) Harmaja | | a | |
| Rhododendron superbum Sleumer | | a | |
| Rhododendron supranubium Hutch. | Rhododendron pachypodum Balf. f. & W. W. Sm. | | |
| Rhododendron taggianum Hutch. | | a | |
| Rhododendron tamaense Davidian | Rhododendron cinnabarinum Hook. f. subsp. tamaense (Davidian) Cullen | | |
| Rhododendron telmateium Balf. f. & W. W. Sm. | | a | i |
| Rhododendron tephropeplum Balf. f. & Forrest | | a | i |
| Rhododendron timeteum Balf. f. & Forrest | Rhododendron oreotrephes W. W. Sm. | | i |
| Rhododendron tolmachevii Harmaja | | a | |
| Rhododendron tomentosum Harmaja | | a | |
| Rhododendron tomentosum Harmaja subsp. subarcticum (Harmaja) G. D. Wallace | Rhododendron subarcticum Harmaja | | i |
| Rhododendron tomentosum Harmaja subsp. tomentosum | Rhododendron tomentosum Harmaja | | i |
| Rhododendron trichocladum Franch. | | a | |
| Rhododendron trichostomum Franch. | | a | |
| Rhododendron triflorum Hook. f. | | a | i |
| Rhododendron triumphans Yersin & A. Chev. | | a | |
| Rhododendron uniflorum Kingdon-Ward | | a | |
| Rhododendron uniflorum Kingdon-Ward var. imperator (Kingdon-Ward) Cullen | | a | i |
| Rhododendron uniflorum Kingdon-Ward var. uniflorum | | a | i |
| Rhododendron vaccinioides Hook. f. | | a | i |
| Rhododendron valentinianum Forrest ex Hutch. | | a | |
| Rhododendron vandeursenii Sleumer | Rhododendron vitis-idaea Sleumer | | |
| Rhododendron veitchianum Hook. | | a | |
| Rhododendron vidalii Rolfe | | a | |
| Rhododendron vilmorinianum Balf. f. | Rhododendron augustinii Hemsl. subsp. augustinii | | i |
| Rhododendron virgatum Hook. f. | | a | i |
| Rhododendron virgatum Hook. f. subsp. oleifolium (Franch.) Cullen | | a | i |
| Rhododendron virgatum Hook. f. subsp. virgatum | | a | i |
| Rhododendron vitis-idaea Sleumer | | a | |
| Rhododendron womersleyi Sleumer | | a | |
| Rhododendron xanthocodon Hutch. | Rhododendron cinnabarinum Hook. f. subsp. xanthocodon (Hutch.) Cullen | | |
| Rhododendron yanthinum Bureau & Franch. | Rhododendron concinnum Hemsl. | | |
| Rhododendron yelliotii Warb. | | a | |
| Rhododendron yungningense Balf. f. ex Hutch. | | a | i |
| Rhododendron yunnanense Franch. | | a | |
| Rhododendron zaleucum Balf. f. & W. W. Sm. | | a | i |
| Rhododendron zoelleri Warb. | | a | |