Plant Index
- Radermachera
- Raukaua
- Rhabdothamnus
- Rhamnella
Rhamnus Buckthorn
- Rhamnus alnifolia
- Rhamnus arguta
- Rhamnus cathartica Common buckthorn
- Rhamnus costata
- Rhamnus davurica
- Rhamnus infectoria
- Rhamnus japonica
- Rhamnus lanceolata
- Rhamnus pumila Dwarf Buckthorn
Rhamnus saxatilis Rock Buckthorn
- subsp. tinctoria Dyer's Buckthorn
- Rhamnus utilis
- Rhapidophyllum
- Rhodochiton
Rhododendron
- Menziesia multiflora
- Rhododendron aberconwayi
- Rhododendron acuminatum
- Rhododendron adenopodum
- Rhododendron adenosum
- Rhododendron aequabile
- Rhododendron afghanicum
- Rhododendron agastum
- Rhododendron × agastum
- Rhododendron alabamense
- Rhododendron albertsenianum
- Rhododendron albiflorum
- Rhododendron albrechtii
- Rhododendron album
- Rhododendron alticolum
- Rhododendron amagianum
- Rhododendron ambiguum
- Rhododendron amesiae
- Rhododendron anagalliflorum
- Rhododendron annae
- Rhododendron anthopogonoides
- Rhododendron anthosphaerum
- Rhododendron anwheiense
- Rhododendron aperantum
- Rhododendron araiophyllum
- Rhododendron arfakianum
- Rhododendron armitii
- Rhododendron atlanticum
- Rhododendron atropurpureum
- Rhododendron atrovirens
- Rhododendron auriculatum
- Rhododendron aurigeranum
- Rhododendron auritum
- Rhododendron austrinum
- Rhododendron baenitzianum
- Rhododendron bagobonum
- Rhododendron baileyi
- Rhododendron bainbridgeanum
- Rhododendron balangense
- Rhododendron basilicum
- Rhododendron batemanii
- Rhododendron bathyphyllum
- Rhododendron beesianum
- Rhododendron beyerinckianum
- Rhododendron bhutanense
- Rhododendron blackii
- Rhododendron bracteatum
- Rhododendron bryophilum
- Rhododendron bureavii
- Rhododendron bureavioides
- Rhododendron burttii
- Rhododendron buxifolium
- Rhododendron caesium
- Rhododendron caliginis
- Rhododendron camelliiflorum
- Rhododendron canadense Rhodora
- Rhododendron x candelabrum
- Rhododendron canescens
- Rhododendron capitatum
- Rhododendron carneum
- Rhododendron carrii
- Rhododendron carringtoniae
- Rhododendron catacosmum
- Rhododendron catawbiense
- Rhododendron cerasinum
- Rhododendron championiae
- Rhododendron chionanthum
- Rhododendron chlorops
- Rhododendron christi
- Rhododendron christianae
- Rhododendron chryseum
- Rhododendron chrysodoron
- Rhododendron ciliatum
- Rhododendron clementinae
- Rhododendron coeloneuron
- Rhododendron collettianum
- Rhododendron columbianum
- Rhododendron commonae
- Rhododendron complexum
- Rhododendron coriaceum
- Rhododendron coryanum
- Rhododendron cowanianum
- Rhododendron coxianum
- Rhododendron crassifolium
- Rhododendron crassum
- Rhododendron cruttwellii
- Rhododendron cuffeanum
- Rhododendron culminicolum
Rhododendron Cultivars A
- A. Gilbert
- 'Addy Wery'
- Adelaide
- 'Admiral Piet Hein'
- 'Adriaan Koster'
- 'Aladdin' (auriculatum × griersonianum)
- 'Albatross'
- Albatross (discolor × Loderi)
- 'Album Elegans'
- 'Album Grandiflorum'
- 'Alice'
- 'Alice'
- 'Alice de Stuers'
- 'Alice Street'
- Alison Johnstone (concatenans × yunnanense)
- 'Alpine Glow' (calophytum × Loderi)
- 'Altaclarense'
- Altaclerense (arboreum × (catawbiense seedling × ponticum))
- 'Amber Rain'
- Amor (griersonianum × thayerianum)
- Angelo (discolor × griffithianum)
- 'Annabella'
- 'Anny'
- 'Apple Blossom'
- 'April Glow'
- 'Arborfield'
- 'Arbutifolium'
- Argosy
- 'Argosy Snow White'
- 'Armistice Day'
- 'Arthur Bedford'
- Arthur J. Ivens (houlstonii × williamsianum)
- 'Arthur Osborn'
- 'Asa-Gasumi'
- 'Ascot Brilliant'
- 'Atalanta'
- Augfast (augustinii × fastigiatum)
- Aurora (Kewense × thomsonii)
- 'Avalanche'
- Avalanche (calophytum × Loderi)
- Azaleoides
- Azor (discolor × griersonianum)
- 'Azuma-Kagami'
Rhododendron Cultivars B
- 'B. de Bruin'
- 'Babeuff'
- 'Bagshot Ruby'
- 'Ballerina'
- 'Balzac'
- Barclayi ('Glory of Penjerrick' × thomsonii)
- 'Baron Schroeder'
- 'Baroness Henry Schroeder'
- 'Baroness Lionel de Rothschild'
- 'Basilisk'
- 'Beauty of Littleworth'
- Beauty of Tremough (arboreum × griffithianum)
- 'Beefeater'
- 'Beethoven'
- 'Beethoven'
- 'Bengal Beauty'
- Bengal Fire (kaempferi × oldhamit)
- 'Berryrose'
- 'Betty'
- 'Betty Wormald'
- 'Bianchi'
- Bibiani (arboreum × 'Moser's Maroon')
- 'Billy Budd'
- 'Binfield'
- Biskra
- 'Blaauw's Pink'
- 'Blandyanum'
- 'Blewbury'
- Blue Diamond (augustinii × Intrifast)
- 'Blue Peter'
- Blue Tit (augustinii × impeditum)
- Bluebird (augustinii × intricatum)
- Bluestone
- Bo-peep (lutescens × moupinense)
- 'Boddaertianum'
- 'Bodnant Yellow'
- 'Bonfire'
- Bonito (discolor × Luscombei)
- 'Boule de Neige'
- Bow Bells ('Corona' × williamsianum)
- 'Brazil'
- Bric-a-brac (leucaspis × moupinense)
- 'Bridesmaid'
- 'Britannia'
- Brocade (? × williamsianum)
- 'Broughtonii'
- 'Broughtonii Aureum'
- 'Bulstrode'
- 'Butterfly'
- 'Byron'
Rhododendron Cultivars C
- 'C. B. van Nes'
- 'Caerhays Philip'
- Calfort
- 'Campfire'
- 'Canary'
- 'Cara Mia'
- Carex (fargesii × irroratum)
- Carita (campylocarpum × 'Naomi')
- Carmen (forrestii × sanguineum subsp. didymum)
- 'Caucasicum Pictum'
- 'Cecile'
- 'Cetewayo'
- 'Champagne'
- 'Charlotte de Rothschild'
- Chaste (campylocarpum × 'Queen of the May')
- 'Chevalier A. de Reali'
- 'Chevalier Felix de Sauvage'
- 'Chikor'
- China (fortunei × wightii)
- 'Chink'
- 'Chionoides'
- 'Chippewa'
- Choremia (arboreum × haematodes)
- 'Christmas Cheer'
- 'Christopher Wren'
- Cilpinense (ciliatum × moupinense)
- Cinnkeys (cinnabarinum × keysii)
- 'Coccinea Speciosa'
- 'Colonel Rogers'
- Comely (concatenans × 'Lady Chamberlain')
- 'Concessum's Master'
- Conroy (cinnabarinum var. roylei × concatenans)
- 'Constable'
- 'Constant Nymph'
- 'Corneille'
- Cornish Cross (griffithianum × thomsonii)
- Cornubia (arboreum × Shilsonii)
- 'Coronation Lady'
- 'Corry Koster'
- 'Countess of Athlone'
- 'Countess of Derby'
- 'Countess of Haddington'
- 'Countess of Sefton'
- Cowslip (wardii × williamsianum)
- 'Crest'
- Crossbill (lutescens × spinuliferum)
- Cunninghamii
- 'Cunningham's Album Compactum'
- 'Cunningham's Blush'
- 'Cunningham's Sulphur'
- 'Cunningham's White'
- 'Curlew'
- 'Cynthia'
Rhododendron Cultivars D
- 'Dairy Maid'
- Damaris (campylocarpum × 'Dr Stocker')
- 'Dame Nellie Melba'
- Damozel ('A. W. bright rose' × griersonianum)
- 'Daphne Daffarn'
- Daphne Group
- 'David'
- 'Daviesii'
- 'Dawn's Delight'
- 'Dayan'
- 'Daybreak'
- Daydream (griersonianum × Lady Bessborough)
- 'Delicatissima'
- 'Devon'
- 'Diamond'
- 'Diane'
- 'Diphole Pink'
- 'Directeur Moerlands'
- 'Doncaster'
- 'Double Damask'
- 'Dr A. W. Endtz'
- 'Dr M. Oosthoek'
- 'Dr Stocker'
- 'Duchess of Connaught'
- 'Duchess of Portland'
- 'Duchess of Teck'
- 'Duchess of York'
- Duke of Cornwall (arboreum × barbatum)
Rhododendron Cultivars E
- 'Earl of Athlone'
- 'Earl of Donoughmore'
- 'Eddy'
- 'Eileen'
- Eleanore (augustinii × desquamatum)
- Elisabeth Hobbie ('Essex Scarlet' × forrestii)
- Elizabeth (forrestii × griersonianum)
- 'Elizabeth Lockhart'
- 'Elsa Crisp'
- Elsae
- 'Elspeth'
- 'Emasculum'
- 'Emerald Isle'
- 'Essex Scarlet'
- Ethel (F. C. Puddle × forrestii)
- 'Eva Goude'
- 'Everestianum'
- 'Exbury Cornish Cross'
- 'Exbury Lady Chamberlain'
- 'Exbury Naomi'
- Exminster (campylocarpum × thomsonii)
- 'Exquisita'
Rhododendron Cultivars F
- Fabia (dichroanthum × griersonianum)
- 'Faggetter's Favourite'
- Fairy Light (griersonianum × 'Lady Mar')
- 'Fanny'
- 'Farall Yellow'
- 'Fastuosum Flore Pleno'
- 'Favorite'
- 'Final Blush'
- 'Floradora'
- 'Floriade'
- 'Florida'
- 'Forsteriana'
- Fortune (falconeri × sinogrande)
- Fragrans
- 'Fragrantissimum'
- 'Francis B. Hayes'
- 'Frank Galsworthy'
- 'Frans van der Bom'
- 'Freya'
- 'Frieda'
- 'Fujimanyo'
- 'Furnivall's Daughter'
- Fusilier (elliottii × griersonianum)
Rhododendron Cultivars G
- 'G. A. Sims'
- 'Galactic'
- 'Galloper Light'
- Gaul (elliottii × Shilsonii)
- 'Gauntlettii'
- 'Gemmiferum'
- 'Geoffroy Millais'
- 'George Hardy'
- 'George Johnstone'
- 'George Reynolds'
- 'Gibraltar'
- 'Gilian'
- Gladys (campylocarpum × fortunei)
- 'Gladys Rose'
- 'Glory of Littleworth'
- 'Glowing Ember'
- 'Gog'
- 'Goldcrest'
- 'Golden Eye'
- Golden Horn (dichroanthum × elliottii)
- 'Golden Orfe'
- 'Golden Oriole'
- Golden Oriole (moupinense × sulfureum)
- 'Golden Sunset'
- 'Goldfort'
- 'Goldsworth Crimson'
- 'Goldsworth Orange'
- 'Goldsworth Yellow'
- 'Gomer Waterer'
- 'Govenianum'
- 'Graciosa'
- 'Grand Arab' ('The Grand Arab')
- Grenadier (elliottii × 'Moser's Maroon')
- Grievei
- 'Grilse'
- Grosclaude (eriogynum × haematodes)
- Gumpo
- 'Gumpo Fancy'
- 'Gumpo Red'
- 'Gumpo White'
Rhododendron Cultivars H
- Halcyone (Lady Bessborough × souliei)
- 'Hamlet'
- 'Hammondii'
- 'Handsworth Early White'
- 'Hardijzer Beauty'
- Harrisii (arboreum × thomsonii)
- 'Harvest Moon'
- 'Hatsugiri'
- Hawk ('Lady Bessborough' × wardii)
- 'Helene Schiffner'
- 'Hexe'
- 'Hinodegiri'
- 'Hinomayo'
- 'Hollandia'
- 'Homebush'
- 'Hortulanus H. Witte'
- 'Hotspur'
- 'Hugh Koster'
- 'Hugh Wormald'
- Humming Bird (haematodes × williamsianum)
- 'Hyperion'
Rhododendron Cultivars I
- Ibex (griersonianum × pocophorum)
- 'Icecream'
- Idealist (Naomi × wardii)
- 'Ilam Violet'
- 'Ima-shojo'
- Impeanum (hanceanum × impeditum (fastigiatum?))
- Impi (sanguineum subsp. didymum × 'Moser's Maroon')
- Inamorata (discolor × wardii)
- Intrifast (fastigiatum × intricatum)
- 'Irene Koster'
- 'Irohayama'
- 'Isabella Mangles'
- 'Ivery's Scarlet'
Rhododendron Cultivars L
- 'Lady Alice Fitzwilliam'
- 'Lady Annette de Trafford'
- Lady Berry ('Rosy Bell' × Royal Flush)
- Lady Bessborough (campylocarpum "var. elatum" × discolor)
- Lady Chamberlain (cinnabarinum var. roylei × Royal Flush, orange form)
- 'Lady Clementine Mitford'
- 'Lady de Rothschild'
- 'Lady Decies'
- 'Lady Eleanor Cathcart'
- 'Lady Grey Egerton'
- 'Lady Longman'
- 'Lady Primrose'
- Lady Rosebery
- 'Lady Rosebery'
- Ladybird ('Corona' × discolor)
- 'Laetevirens'
- Lamellen (campanulatum × griffithianum)
- 'Langley Park'
- 'Langworth'
- 'Lapwing'
- 'Lascaux'
- Laura Aberconway (Barclayi × griersonianum)
- 'Lava Flow'
- 'Lavender Girl'
- 'Lee's Dark Purple'
- 'Lee's Scarlet'
- 'Leo'
- 'Leonard Messel'
- 'Leonardslee Giles'
- Leonore
- Letty Edwards
- 'Lilacinum'
- 'Lionel's Triumph'
- 'Little Ben'
- 'Little Bert'
- Lodauric (auriculatum × Loderi)
- 'Lodauric Iceberg'
- Loderi (fortunei × griffithianum)
- 'Loder's White'
- 'Lord Roberts'
- 'Lord Swaythling'
- 'Lorna'
- 'Louise'
- Luscombei (fortunei × thomsonii)
- 'Luscombei Splendens'
Rhododendron Cultivars M
- 'Madame Albert Moser'
- 'Madame Carvalho'
- 'Madame de Bruin'
- 'Madame Fr. J. Chauvin'
- 'Madame Jules Porges'
- 'Magnifica'
- 'Mahler'
- 'Malvaticum'
- 'Manderley'
- 'Marchioness of Lansdowne'
- 'Marcia'
- 'Marie'
- Mariloo ('Dr Stocker' × lacteum)
- 'Mariloo Eugenie'
- 'Mariloo Gilbury'
- 'Marion Merriman'
- 'Mars'
- 'Martha Hitchcock'
- 'Martine'
- Matador (griersonianum × strigillosum)
- 'Maximum Triumphans'
- 'Maxwellii'
- May Day (griersonianum × haematodes)
- 'Michael Waterer'
- 'Midsummer'
- 'Moerheim'
- 'Moerheim Pink'
- Moonshine ('Adriaan Koster' × litiense)
- 'Moonshine Glow'
- 'Moonshine Supreme'
- Moonstone (campylocarpum × williamsianum)
- 'Morning Cloud'
- 'Moser's Maroon'
- 'Mother of Pearl'
- 'Mother's Day'
- 'Mount Everest'
- 'Mrs A. C. Kenrick'
- 'Mrs A. M. Williams'
- 'Mrs A. T. de la Mare'
- 'Mrs Anthony Waterer'
- 'Mrs Anthony Waterer'
- 'Mrs C. B. van Nes'
- 'Mrs Carmichael'
- 'Mrs Charles E. Pearson'
- 'Mrs Davies Evans'
- 'Mrs Furnivall'
- 'Mrs G. W. Leak'
- 'Mrs J. C. Williams'
- 'Mrs J. G. Millais'
- 'Mrs John Clutton'
- 'Mrs John Kelk'
- 'Mrs John Waterer'
- 'Mrs Kingsmill'
- 'Mrs Lindsay Smith'
- 'Mrs Lionel de Rothschild'
- 'Mrs Mary Ashley'
- 'Mrs Oliver Slocock'
- 'Mrs P. D. Williams'
- 'Mrs Peter Koster'
- 'Mrs Philip Martineau'
- 'Mrs R. S. Holford'
- 'Mrs T. H. Lowinsky'
- 'Mrs Tom Agnew'
- 'Mrs William Agnew'
- Mucronatum
- Multiflorum (ciliatum × virgatum)
- 'Mum'
- 'Myrtifolium'
Rhododendron Cultivars P
- 'Palestrina'
- 'Pallas'
- 'Pauline'
- 'Peace'
- Penjerrick (campylocarpum × griffithianum)
- 'Perdita'
- Perseverance (cinnabarinum var. roylei × 'Lady Chamberlain')
- 'Persil'
- 'Persimmon'
- 'Phalarope'
- 'Philip Waterer'
- 'Phoebe'
- 'Phoeniceum'
- 'Picotee'
- 'Pink Cherub'
- 'Pink Diamond'
- 'Pink Drift'
- 'Pink Pearl'
- 'Pink Pebble'
- 'Pippa'
- Polar Bear (auriculatum × diaprepes)
- 'Port Knap'
- Praecox (ciliatum × dauricum)
- 'Pride of Leonardslee'
- 'Prince Camille de Rohan'
- 'Princess Alice'
- 'Princess Anne'
- 'Princess Juliana'
- 'Princess Marina'
- 'Prins Bernhard'
- 'Prinses Juliana'
- 'Prof. Hugo de Vries'
- 'Prometheus'
- Prostigiatum
- 'Ptarmigan'
- 'Puncta'
- 'Purity'
- 'Purple Emperor'
- 'Purple Splendour'
- 'Purple Triumph'
- 'Purpureum Elegans'
- 'Purpureum Grandiflorum'
- 'Pygmalion'
Rhododendron Cultivars R
- Racil (ciliatum × racemosum)
- 'Rashomon'
- Red Admiral (arboreum × thomsonii)
- Red Cap (eriogynum × sanguineum subsp. didymum)
- 'Redshank'
- Remo (lutescens × valentinianum)
- 'Revlon'
- 'Ria Hardijzer'
- 'Robert Keir'
- 'Roberte'
- Romany Chai (griersonianum × 'Moser's Maroon')
- Romany Chal (eriogynum × 'Moser's Maroon')
- 'Rosebud'
- 'Rosenkavalier'
- 'Roseum Elegans'
- 'Rosy Bell'
- Royal Flush (cinnabarinum × maddenii)
- 'Royal Purple'
- 'Roza Stevenson' ('Roza Harrison')
- Russautinii (augustinii × russatum)
- Russellianum (arboreum × catawbiense)
Rhododendron Cultivars S
- 'Saint Breward'
- 'Saint Merryn'
- 'Saint Tudy'
- 'Sang de Gentbrugge'
- 'Saotome'
- 'Sapphire'
- 'Sappho'
- Sarita Loder (griersonianum × Loderi)
- Sarled (sargentianum × trichostomum)
- 'Satan'
- 'Scandinavia'
- 'Sekidera'
- Seta (moupinense × spinuliferum)
- 'Seven Stars'
- Shilsonii (barbatum × thomsonii)
- 'Shin-sekai'
- 'Shiromanyo'
- 'Sigismund Rucker'
- 'Silver Moon'
- 'Silver Slipper'
- 'Sir Charles Lemon'
- 'Sir Edmund'
- Sir Frederick Moore (discolor × St Keverne)
- Sir John Ramsden ('Corona' × thomsonii)
- 'Sir Joseph Hooker'
- Sir William Lawrence
- Siren (Choremia × griersonianum)
- Smithii (arboreum × ponticum)
- 'Smithii Aureum'
- 'Snow Lady'
- Snow Queen ('White Pearl' ('Halopeanum') × Loderi)
- 'Snowflake'
- 'Soleil d'Austerlitz' ('Sun of Austerlitz')
- 'Songbird'
- 'Southamptonia'
- 'Southern Cross'
- 'Souvenir de Dr S. Endtz'
- 'Souvenir of Anthony Waterer'
- 'Souvenir of W. C. Slocock'
- 'Spek's Brilliant'
- 'Spek's Orange'
- Spinulosum (racemosum × spinuliferum)
- 'Splendens'
- 'Stanley Davies'
- Stanleyanum (arboreum album × campanulatum)
- 'Starfish'
- 'Stewartstonian'
- 'Strategist'
- 'Strawberry Ice'
- 'Streatley'
- 'Suga-no-ito'
Rhododendron Cultivars T
- 'Takasago'
- Tally Ho (eriogynum × griersonianum)
- 'Tebotan'
- 'Ted Waterer'
- Temple Belle (orbiculare × williamsianum)
- Tessa (moupinense × Praecox)
- 'Tessa Roza'
- 'The Bride'
- 'The Hon. Jean Marie Montagu'
- 'The Master'
- 'The Queen'
- 'The Queen Mother'
- 'The Warrior'
- 'Theale'
- Thomwilliams (thomsonii × williamsianum)
- 'Thunderstorm'
- 'Topsvoort Pearl'
- 'Torch'
- 'Torlonianum'
- Tortoiseshell ('Goldsworth Orange' × griersonianum)
- 'Toucan'
- 'Towardii'
- 'Treasure'
- Tregedna
- 'Trewithen Orange'
- Rhododendron cumberlandense
- Rhododendron cuneatum
- Rhododendron cyanocarpum
- Rhododendron dasypetalum
- Rhododendron davidii
- Rhododendron davidsonianum
- Rhododendron decandrum
- Rhododendron × decipiens
- Rhododendron dendricola
- Rhododendron dendrocharis
- Rhododendron denudatum
- Rhododendron desquamatum
- Rhododendron detonsum
- Rhododendron dianthosmum
- Rhododendron dielsianum
- Rhododendron dignabile
- Rhododendron dilatatum
- Rhododendron dimitrium
- Rhododendron diphrocalyx
- Rhododendron discolor
- Rhododendron × edgarianum
- Rhododendron elegantulum
- Rhododendron elliottii
- Rhododendron ericoides
- Rhododendron eriocarpum
- Rhododendron × erythrocalyx
- Rhododendron esetulosum
- Rhododendron eurysiphon
- Rhododendron exasperatum
- Rhododendron excellens
- Rhododendron faberi
- Rhododendron facetum
- Rhododendron fallacinum
- Rhododendron faucium
- Rhododendron flammeum
- Rhododendron fletcherianum
- Rhododendron flinckii
- Rhododendron floribundum
- Rhododendron flumineum
- Rhododendron formosanum
- Rhododendron fragariiflorum
- Rhododendron galactinum
- Rhododendron gardenia
- Rhododendron genestierianum
- Rhododendron giulianettii
- Rhododendron glanduliferum
- Rhododendron glischroides
- Rhododendron goodenoughii
- Rhododendron goreri
- Rhododendron gracilentum
- Rhododendron griersonianum
- Rhododendron griffithianum
Rhododendron groenlandicum Labrador Tea
- Rhododendron grothausii
- Rhododendron gymnocarpum
- Rhododendron habrotrichum
- Rhododendron haofui
- Rhododendron headfortianum
- Rhododendron hedyosmum
- Rhododendron heftii
- Rhododendron hellwigii
- Rhododendron hemitrichotum
- Rhododendron hemsleyanum
- Rhododendron herzogii
- Rhododendron hidakanum
- Rhododendron × hillieri
- Rhododendron himantodes
- Rhododendron hirtipes
- Rhododendron hodgsonii
- Rhododendron hongkongense
- Rhododendron hooglandii
- Rhododendron hookeri
- Rhododendron horlickianum
- Rhododendron houlstonii
- Rhododendron huianum
- Rhododendron hyacinthosmum
- Rhododendron hylaeum
- Rhododendron hyperythrum
- Rhododendron hypoleucum
- Rhododendron imberbe
- Rhododendron impeditum
- Rhododendron inconspicuum
- Rhododendron inopinum
- Rhododendron insigne
- Rhododendron intranervatum
- Rhododendron japonicum
- Rhododendron jasminiflorum
- Rhododendron javanicum
- Rhododendron kanehirae
- Rhododendron kawakamii
- Rhododendron kendrickii
- Rhododendron keysii
- Rhododendron kiyosumense
- Rhododendron kongboense
- Rhododendron konori
- Rhododendron kroniae
- Rhododendron lacteum
- Rhododendron laetum
- Rhododendron lanatoides
- Rhododendron lanceolatum
- Rhododendron lanigerum
- Rhododendron lapponicum
- Rhododendron latoucheae
- Rhododendron lepidotum
- Rhododendron leptanthum
- Rhododendron leptocarpum
- Rhododendron leptothrium
- Rhododendron leucogigas
- Rhododendron levinei
- Rhododendron lindaueanum
- Rhododendron lochiae
- Rhododendron longesquamatum
- Rhododendron longiflorum
- Rhododendron longipes
- Rhododendron longistylum
- Rhododendron loranthiflorum
- Rhododendron lowii
- Rhododendron lowndesii
- Rhododendron luciferum
- Rhododendron ludlowii
- Rhododendron ludwigianum
- Rhododendron lukiangense
- Rhododendron luraluense
- Rhododendron luteiflorum
- Rhododendron lutescens
- Rhododendron luteum
- Rhododendron lyi
- Rhododendron lysolepis
- Rhododendron macabeanum
- Rhododendron macgregoriae
- Rhododendron macrophyllum
- Rhododendron maculiferum
- Rhododendron magnificum
- Rhododendron maius
- Rhododendron makinoi
- Rhododendron malayanum
- Rhododendron mallotum
- Rhododendron mariesii
- Rhododendron maybarae
- Rhododendron megacalyx
- Rhododendron megeratum
- Rhododendron menziesii
- Rhododendron micranthum
- Rhododendron microgynum
- Rhododendron micromalayanum
- Rhododendron microphyton
- Rhododendron mollicomum
- Rhododendron monosematum
- Rhododendron montroseanum
- Rhododendron moulmainense
- Rhododendron moupinense
- Rhododendron mucronatum
- Rhododendron multicolor
- Rhododendron multiflorum
- Rhododendron multinervium
- Rhododendron myrtifolium
- Rhododendron nakaharae
- Rhododendron nakotiltum
- Rhododendron neoglandulosum
- Rhododendron nervulosum
- Rhododendron nigroglandulosum
- Rhododendron nipponicum
- Rhododendron noriakianum
- Rhododendron notiale
- Rhododendron nuttallii
- Rhododendron oblongifolium
- Rhododendron obtusum
- Rhododendron occidentale
- Rhododendron ochraceum
- Rhododendron oldhamii
- Rhododendron orbiculatum
- Rhododendron oreotrephes
- Rhododendron ovatum
- Rhododendron pachypodum
- Rhododendron pachysanthum
- Rhododendron papillatum
- Rhododendron parmulatum
- Rhododendron parryae
- Rhododendron pauciflorum
- Rhododendron pendulum
- Rhododendron pentandrum
- Rhododendron pentaphyllum
- Rhododendron perakense
- Rhododendron peregrinum
- Rhododendron periclymenoides
- Rhododendron phaeochitum
- Rhododendron piercei
- Rhododendron pingianum
- Rhododendron × planecostatum
- Rhododendron planetum
- Rhododendron pleianthum
- Rhododendron pleistanthum
- Rhododendron poluninii
- Rhododendron polyanthemum
- Rhododendron polycladum
- Rhododendron polylepis
- Rhododendron praeteritum
- Rhododendron praetervisum
- Rhododendron praevernum
- Rhododendron prattii
- Rhododendron preptum
- Rhododendron principis
- Rhododendron prinophyllum
- Rhododendron pronum
- Rhododendron proteoides
- Rhododendron pruniflorum
- Rhododendron prunifolium
- Rhododendron pubescens
- Rhododendron pudorosum
- Rhododendron pulchrum
- Rhododendron purdomii
- Rhododendron purpureiflorum
- Rhododendron quadrasianum
- Rhododendron quinquefolium
- Rhododendron ramsdenianum
- Rhododendron rarilepidotum
- Rhododendron rarum
- Rhododendron recurvoides
- Rhododendron retivenium
- Rhododendron retusum
- Rhododendron rhodoleucum
- Rhododendron rigidum
- Rhododendron ripense
- Rhododendron ririei
- Rhododendron robinsonii
- Rhododendron roseatum
- Rhododendron rothschildii
- Rhododendron rubiginosum
- Rhododendron rubineiflorum
- Rhododendron rufum
- Rhododendron rugosum
- Rhododendron russatum
- Rhododendron saisiuense
- Rhododendron sanctum
- Rhododendron santapaui
- Rhododendron saxicolum
- Rhododendron saxifragoides
- Rhododendron sayeri
- Rhododendron scabridibracteum
- Rhododendron schlippenbachii
- Rhododendron schoddei
- Rhododendron scintillans
- Rhododendron scopulorum
- Rhododendron searleanum
- Rhododendron searsiae
- Rhododendron seinghkuense
- Rhododendron semibarbatum
- Rhododendron semnoides
- Rhododendron serotinum
- Rhododendron serpyllifolium
- Rhododendron sessilifolium
- Rhododendron setosum
- Rhododendron × sheilae
- Rhododendron shepherdii
- Rhododendron sherriffii
- Rhododendron shweliense
- Rhododendron sidereum
- Rhododendron siderophyllum
- Rhododendron simiarum
- Rhododendron sinofalconeri
- Rhododendron smirnowii
- Rhododendron × sochadzeae
- Rhododendron solitarium
- Rhododendron sororium
- Rhododendron sperabiloides
- Rhododendron sphaeroblastum
- Rhododendron spiciferum
- Rhododendron spilotum
- Rhododendron spinuliferum
- Rhododendron stamineum
- Rhododendron stapfianum
- Rhododendron stenopetalum
- Rhododendron stenophyllum
- Rhododendron stevensianum
- Rhododendron strigillosum
- Rhododendron suaveolens
- Rhododendron subansiriense
- Rhododendron subsessile
- Rhododendron succothii
- Rhododendron sulfureum
- Rhododendron sumatranum
- Rhododendron superbum
- Rhododendron sutchuenense
- Rhododendron taggianum
- Rhododendron taliense
- Rhododendron tapetiforme
- Rhododendron tashiroi
- Rhododendron tatsienense
- Rhododendron tephropeplum
- Rhododendron thayerianum
- Rhododendron thymifolium
- Rhododendron tolmachevii
- Rhododendron tosaense
- Rhododendron trichanthum
- Rhododendron trichostomum
- Rhododendron tschonoskii
- Rhododendron tsusiophyllum
- Rhododendron tuba
- Rhododendron ungernii
- Rhododendron vaccinioides
- Rhododendron vaseyi
- Rhododendron venator
- Rhododendron vernicosum
- Rhododendron verruculosum
- Rhododendron versteegii
- Rhododendron vesiculiferum
- Rhododendron vialii
- Rhododendron vilmorinianum
- Rhododendron viridescens
- Rhododendron viscidifolium
- Rhododendron vitis-idaea
- Rhododendron wadanum
- Rhododendron wallichii
- Rhododendron walongense
- Rhododendron websterianum
- Rhododendron wightii
- Rhododendron williamsii
- Rhododendron wilsoniae
- Rhododendron wiltonii
- Rhododendron womersleyi
- Rhododendron wongii
- Rhododendron wrightianum
- Rhododendron yakushimanum
- Rhododendron yelliotii
- Rhododendron yongii
- Rhododendron yungningense
- Rhododendron zoelleri
- Rhododendron: The Hybrids / Additional Notes
- Rhododendron: The Hybrids / Azalea Hybrids - Deciduous
- Rhododendron: The Hybrids / Azalea Hybrids - Evergreen
- Rhododendron: The Hybrids / Azaleodendrons
- Rhododendron: The Hybrids / Introduction
- Rhododendron: The Hybrids / Rhododendron Hybrids
- Rhododendron: The Species / Classification
- Rhodoleia
Rhodotypos
- Rhodotypos scandens Jetbead, Jet Bead, Black Jetbead, Kaimastrauch, Schneekerrie, Scheinkerrie, Kaimastruik, Schijnkerria, シロヤマブキ shiro-yamabuki, 鸡麻 ji ma
Rhoiptelea Horsetail Tree
- Rhoiptelea chiliantha Horsetail Tree, ma wei shu
- Rhopalostylis
Rhus Sumac, Sumach
- Rhus chinensis
- Rhus copallinum Dwarf Sumach
- Rhus michauxii Dwarf Sumac
- Rhus potaninii
- Rhus × pulvinata
- Rhus punjabensis
Rhus typhina Stag's-horn Sumach
Ribes Currants and Gooseberries
- Ribes ambiguum
- Ribes americanum American black currant
- Ribes × beatonii
- Ribes bracteosum Californian Black Currant
- Ribes ciliatum
- Ribes curvatum
- Ribes diacantha
- Ribes henryi
- Ribes laurifolium
- Ribes lobbii
- Ribes longeracemosum
- Ribes menziesii
Ribes odoratum Buffalo Currant
- 'Aurantiacum Minus'
- f. xanthocarpum
- R aureum Golden Currant
- Ribes orientale
- Ribes pinetorum
- Ribes speciosum
- Ribes tenue
- Ribes trilobum
Ribes uva-crispa Common Gooseberry
- Ribes valdivianum
- Ribes viburnifolium
- Ribes wolfii
Robinia
Robinia hispida Rose Acacia
- 'Macrophylla'
- 'Monument'
- var. fertilis
- var. nana
- var. rosea Boynton Acacia
- Robinia neomexicana
Robinia viscosa Clammy Locust
Romneya
Romneya coulteri California Tree Poppy
Rosa
- Rosa albertii
- Rosa anemoniflora
- Rosa beggeriana
- Rosa biebersteinii
Rosa bracteata Macartney Rose
Rosa brunonii Himalayan Musk Rose
Rosa canina Common Brier, Dog Rose
Rosa chinensis
- 'Fortune's Double Yellow' ('Beauty of Glazenwood', 'Gold of Ophir')
- 'Minima' Miss Lawrance's Rose
- 'Mutabilis'
- 'Ochroleuca' Parks' Yellow China
- 'Pallida' Pink or Blush China
- 'Persicifolia' ('Salicifolia')
- 'Pumila' Bengale Pompone
- R × odorata
- 'Rouletii'
- 'Semperflorens' Slater's Crimson China
- 'Sulphurea'
- 'Viridiflora'
- Rosa corymbulosa
Rosa damascena Damask Rose
- f. versicolor
- R 'Portlandica' Portland Rose, Scarlet Four Seasons
- 'Trigintipetala' Kazanlik Rose
- var. semperflorens Four Seasons Rose, Monthly Rose, Autumn Damask
Rosa eglanteria Sweet Brier, Eglantine
- Rosa elymaitica
- Rosa fedtschenkoana
- Rosa filipes
Rosa foetida
- 'Bicolor' Austrian Copper Brier
- 'Persiana' Persian Double Yellow
- Rosa foliolosa
- Rosa × fortuniana
- Rosa × francofurtana
Rosa gallica Red Rose
- var. aegyptiaca
- var. holosericea Velvet Roses
- var. officinalis Apothecaries' Rose, Officinal Rose
- 'Versicolor'
- Rosa gigantea
- Rosa glutinosa
- Rosa gymnocarpa
- Rosa helenae
- Rosa hemisphaerica
- Rosa × hibernica
- Rosa hugonis
- Rosa jundzillii
Rosa laevigata Cherokee Rose
- Rosa majalis
- Rosa maximowicziana
- Rosa mulliganii
- Rosa nitida
- Rosa palustris
- Rosa pisocarpa
- Rosa × polliniana
- Rosa prattii
- Rosa pulverulenta
- Rosa × reclinata
- Rosa × reversa
- Rosa × richardii
Rosa roxburghii Burr Rose
- Rosa rubiginosa
- Rosa rubus
- Rosa sambucina
- Rosa setigera Prairie Rose
- Rosa sicula
- Rosa soulieana
- Rosa 'Watsoniana'
- Rosa willmottiae
- Rosa: Roses in the Garden
- Rostrinucula
Rubus
- Rubus adenophorus
- Rubus amabilis
- Rubus 'Benenden'
- Rubus caesius Dewberry
- Rubus calycinoides
- Rubus chroosepalus
Rubus cissoides Bush Lawyer
- Rubus corchorifolius
- Rubus coreanus
- Rubus crataegifolius
- Rubus flagelliflorus
- Rubus flosculosus
- Rubus hispidus
- Rubus hupehensis
- Rubus ichangensis
Rubus idaeus
- R loganobaccus Loganberry
- var. anomalus
- var. strigosus American Raspberry
- Rubus illecebrosus
- Rubus irenaeus
- Rubus koehneanus
- Rubus kuntzeanus
- Rubus lasiostylus
- Rubus malifolius
- Rubus mesogaeus
- Rubus × nobilis
Rubus occidentalis Black Raspberry
- Rubus palmatus
- Rubus parkeri
- Rubus parviflorus Thimbleberry
- Rubus parvifolius
- Rubus parvus
- Rubus pedunculosus
- Rubus phoenicolasius Wineberry
- Rubus playfairianus
- Rubus setchuenensis
Rubus spectabilis Salmonberry
- Rubus subornatus
- Rubus thibetanus
- Rubus trianthus
- Rubus tricolor
- Rubus trifidus