| 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 adamsii Rehder | | a | | Rhododendron adamsiiRehder | |
| 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 artosquameum Balf. f. & Forrest | Rhododendron oreotrephes W. W. Sm. | | | Rhododendron artosquameumBalf. f. & Forrest | Rhododendron oreotrephesW. W. Sm. |
| Rhododendron augustinii Hemsl. | | a | | Rhododendron augustiniiHemsl. | |
| Rhododendron auritum Tagg | | a | | Rhododendron auritumTagg | |
| Rhododendron baileyi Balf. f. | | a | | Rhododendron baileyiBalf. f. | |
| 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 campylogynum Franch. | | a | | Rhododendron campylogynumFranch. | |
| 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 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 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 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 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 cubittii Hutch. | Rhododendron veitchianum Hook. | | | Rhododendron cubittiiHutch. | Rhododendron veitchianumHook. |
| Rhododendron cuffeanum Craib ex Hutch. | | a | | Rhododendron cuffeanumCraib ex Hutch. | |
| 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 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 exquisitum Hutch. | Rhododendron oreotrephes W. W. Sm. | | | Rhododendron exquisitumHutch. | Rhododendron oreotrephesW. W. Sm. |
| Rhododendron fastigiatum Franch. | | a | | Rhododendron fastigiatumFranch. | |
| Rhododendron ferrugineum L. | | a | | Rhododendron ferrugineumL. | |
| Rhododendron formosum Wall. var. inaequale C. B. Clarke | | a | i | Rhododendron formosumWall. var.inaequale C. B. Clarke | |
| Rhododendron ×fragrantissimum Burb. ex Rehder | | a | | Rhododendron fragrantissimumBurb. ex Rehder | |
| Rhododendron genestierianum Forrest | | a | | Rhododendron genestierianumForrest | |
| Rhododendron glomerulatum Hutch. | Rhododendron yungningense Balf. f. ex Hutch. | | | Rhododendron glomerulatumHutch. | Rhododendron yungningenseBalf. f. ex Hutch. |
| Rhododendron heliolepis Franch. | | a | | Rhododendron heliolepisFranch. | |
| Rhododendron hemitrichotum Balf. f. & Forrest | | a | | Rhododendron hemitrichotumBalf. f. & Forrest | |
| Rhododendron hippophaeoides Balf. f. & W. W. Sm. | | a | | Rhododendron hippophaeoidesBalf. f. & W. W. Sm. | |
| Rhododendron hirsutum L. | | a | | Rhododendron hirsutumL. | |
| 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 intricatum Franch. | | a | | Rhododendron intricatumFranch. | |
| Rhododendron iteaphyllum Hutch. | Rhododendron formosum Wall. var. formosum | | | Rhododendron iteaphyllumHutch. | Rhododendron formosumWall. var.formosum |
| Rhododendron johnstoneanum (Brandis) G. Watt ex Hutch. | | a | | Rhododendron johnstoneanum(Brandis) G. Watt ex Hutch. | |
| Rhododendron kasoense Hutch. & Kingdon-Ward | | a | | Rhododendron kasoenseHutch. & Kingdon-Ward | |
| Rhododendron keiskei Miq. | | a | | Rhododendron keiskeiMiq. | |
| Rhododendron lapponicum (L.) Wahlenb. | | a | | Rhododendron lapponicum(L.) Wahlenb. | |
| Rhododendron lepidotum Wall. ex G. Don | | a | | Rhododendron lepidotumWall. ex G. Don | |
| Rhododendron leucaspis Tagg | | a | | Rhododendron leucaspisTagg | |
| Rhododendron lindleyi T. Moore | | a | | Rhododendron lindleyiT. Moore | |
| 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 lowndesii Davidian | | a | | Rhododendron lowndesiiDavidian | |
| Rhododendron lutescens Franch. | | a | | Rhododendron lutescensFranch. | |
| Rhododendron camelliiflorum Hook. f. | | a | | Rhododendron camelliiflorumHook. f. | |
| Rhododendron dalhousieae Hook. f. | | a | | Rhododendron dalhousieaeHook. f. | |
| 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 lepidostylum Balf. f. & Forrest | | a | | Rhododendron lepidostylumBalf. f. & Forrest | |
| Rhododendron longistylum Rehder & E. H. Wilson | | a | | Rhododendron longistylumRehder & E. H. Wilson | |
| Rhododendron ×lysolepis Hutch. | | a | | Rhododendron lysolepisHutch. | |
| 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 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 mollicomum Balf. f. & W. W. Sm. | | a | | Rhododendron mollicomumBalf. f. & W. W. Sm. | |
| Rhododendron moupinense Franch. | | a | | Rhododendron moupinenseFranch. | |
| 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 myrtilloides Balf. f. & Kingdon-Ward | Rhododendron campylogynum Franch. | | | Rhododendron myrtilloidesBalf. f. & Kingdon-Ward | Rhododendron campylogynumFranch. |
| Rhododendron oleifolium Franch. | Rhododendron virgatum Hook. f. subsp. oleifolium (Franch.) Cullen | | | Rhododendron oleifoliumFranch. | Rhododendron virgatumHook. f. subsp. oleifolium (Franch.) Cullen |
| 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 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 ×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 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 ravum Balf. f. & W. W. Sm. | Rhododendron cuneatum W. W. Sm. | | | Rhododendron ravumBalf. f. & W. W. Sm. | Rhododendron cuneatumW. W. Sm. |
| 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 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 scintillans Balf. f. & W. W. Sm. | Rhododendron polycladum Franch. | | | Rhododendron scintillansBalf. f. & W. W. Sm. | Rhododendron polycladumFranch. |
| 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 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 suberosum Balf. f. & Forrest | Rhododendron yunnanense Franch. | | | Rhododendron suberosumBalf. f. & Forrest | Rhododendron yunnanenseFranch. |
| 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 telmateium Balf. f. & W. W. Sm. | | a | | Rhododendron telmateiumBalf. f. & W. W. Sm. | |
| Rhododendron tephropeplum Balf. f. & Forrest | | a | | Rhododendron tephropeplumBalf. f. & Forrest | |
| 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 triflorum Hook. f. | | a | | Rhododendron triflorumHook. f. | |
| Rhododendron valentinianum Forrest ex Hutch. | | a | | Rhododendron valentinianumForrest ex Hutch. | |
| Rhododendron veitchianum Hook. | | a | | Rhododendron veitchianumHook. | |
| 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 yungningense Balf. f. ex Hutch. | | a | | Rhododendron yungningenseBalf. f. ex Hutch. | |
| Rhododendron yunnanense Franch. | | a | | Rhododendron yunnanenseFranch. | |
| 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 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 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 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 glaucophyllum Rehder | | a | | Rhododendron glaucophyllumRehder | |
| Rhododendron capitatum Maxim. | | a | | Rhododendron capitatumMaxim. | |
| Rhododendron groenlandicum (Oeder) Kron & Judd | | a | | Rhododendron groenlandicum(Oeder) Kron & Judd | |
| 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 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 diversipilosum (Nakai) Harmaja | | a | | Rhododendron diversipilosum(Nakai) Harmaja | |
| Rhododendron subulatum (Nakai) Harmaja | | a | | Rhododendron subulatum(Nakai) Harmaja | |
| Rhododendron mucronulatum Turcz. var. maritimum Nakai | | a | i | Rhododendron mucronulatumTurcz. var.maritimum Nakai | |
| 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 |