| Rhododendron aberconwayi Cowan | | a | | Rhododendron aberconwayiCowan | |
| 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 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 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 auriculatum Hemsl. | | a | | Rhododendron auriculatumHemsl. | |
| 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 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 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 bureavii Franch. | | a | | Rhododendron bureaviiFranch. | |
| 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 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 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 citriniflorum Balf. f. & Forrest | | a | | Rhododendron citriniflorumBalf. f. & Forrest | |
| Rhododendron clementinae Forrest | | a | | Rhododendron clementinaeForrest | |
| 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 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 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 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 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 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 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 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 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 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 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 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 hardingii Forrest ex Tagg | Rhododendron annae Franch. | | | Rhododendron hardingiiForrest ex Tagg | Rhododendron annaeFranch. |
| 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 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 insigne Hemsl. & E. H. Wilson | | a | | Rhododendron insigneHemsl. & E. H. Wilson | |
| Rhododendron irroratum Franch. | | a | | Rhododendron irroratumFranch. | |
| Rhododendron ixeuticum Balf. f. & W. W. Sm. | Rhododendron crinigerum Franch. | | | Rhododendron ixeuticumBalf. f. & W. W. Sm. | Rhododendron crinigerumFranch. |
| Rhododendron lacteum Franch. | | a | | Rhododendron lacteumFranch. | |
| Rhododendron lanatum Hook. f. | | a | | Rhododendron lanatumHook. f. | |
| Rhododendron lanigerum Tagg | | a | | Rhododendron lanigerumTagg | |
| 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 litiense Balf. f. & Forrest | Rhododendron wardii W. W. Sm. var. wardii | | | Rhododendron litienseBalf. f. & Forrest | Rhododendron wardiiW. W. Sm. var.wardii |
| 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 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 macrophyllum D. Don ex G. Don | | a | | Rhododendron macrophyllumD. Don ex G. Don | |
| Rhododendron makinoi Tagg ex Nakai | | a | | Rhododendron makinoiTagg ex Nakai | |
| Rhododendron martinianum Balf. f. & Forrest | | a | | Rhododendron martinianumBalf. f. & Forrest | |
| Rhododendron maximum L. | | a | | Rhododendron maximumL. | |
| 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 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 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 niveum Hook. f. | | a | | Rhododendron niveumHook. f. | |
| 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 phaeochrysum Balf. f. & W. W. Sm. | | a | | Rhododendron phaeochrysumBalf. f. & W. W. Sm. | |
| Rhododendron planetum Balf. f. | | a | | Rhododendron planetumBalf. f. | |
| 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 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 proteoides Balf. f. & W. W. Sm. | | a | | Rhododendron proteoidesBalf. f. & W. W. Sm. | |
| Rhododendron protistum Balf. f. & Forrest | | a | | Rhododendron protistumBalf. f. & Forrest | |
| 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 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 roxieanum Forrest | | a | | Rhododendron roxieanumForrest | |
| Rhododendron rufum Batalin | | a | | Rhododendron rufumBatalin | |
| 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 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 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 selense Franch. | | a | | Rhododendron selenseFranch. | |
| Rhododendron serpens Balf. f. & Forrest | Rhododendron erastum Balf. f. & Forrest | | | Rhododendron serpensBalf. f. & Forrest | Rhododendron erastumBalf. f. & Forrest |
| 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 sidereum Balf. f. | | a | | Rhododendron sidereumBalf. f. | |
| 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 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 stewartianum Diels | | a | | Rhododendron stewartianumDiels | |
| Rhododendron strigillosum Franch. | | a | | Rhododendron strigillosumFranch. | |
| Rhododendron sutchuenense Franch. | | a | | Rhododendron sutchuenenseFranch. | |
| Rhododendron taliense Franch. | | a | | Rhododendron talienseFranch. | |
| 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 thomsonii Hook. f. | | a | | Rhododendron thomsoniiHook. f. | |
| Rhododendron traillianum Forrest & W. W. Sm. | | a | | Rhododendron traillianumForrest & W. W. Sm. | |
| 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 ungernii Trautv. | | a | | Rhododendron ungerniiTrautv. | |
| Rhododendron vernicosum Franch. | | a | | Rhododendron vernicosumFranch. | |
| Rhododendron vesiculiferum Tagg | | a | | Rhododendron vesiculiferumTagg | |
| Rhododendron wardii W. W. Sm. | | a | | Rhododendron wardiiW. W. Sm. | |
| Rhododendron wasonii Hemsl. & E. H. Wilson | | a | | Rhododendron wasoniiHemsl. & E. H. Wilson | |
| Rhododendron wightii Hook. f. | | a | | Rhododendron wightiiHook. f. | |
| Rhododendron williamsianum Rehder & E. H. Wilson | | a | | Rhododendron williamsianumRehder & E. H. Wilson | |
| 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 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 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 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 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 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 ×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 purdomii Rehder & E. H. Wilson | | a | | Rhododendron purdomiiRehder & E. H. Wilson | |
| 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 fortunei Lindl. subsp. fortunei | | a | i | Rhododendron fortuneiLindl. subsp. fortunei | |
| 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 hirtipes Tagg | | a | | Rhododendron hirtipesTagg | |
| Rhododendron hookeri Nutt. | | a | | Rhododendron hookeriNutt. | |
| 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 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 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 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. |